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 #ifdef XINERAMA
  41 #include <X11/extensions/Xinerama.h>
  42 #endif /* XINERAMA */
  43
  44 /* macros */
  45 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  46 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  47 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  48                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  49 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  50 #define LENGTH(X)               (sizeof X / sizeof X[0])
  51 #define MAX(A, B)               ((A) > (B) ? (A) : (B))
  52 #define MIN(A, B)               ((A) < (B) ? (A) : (B))
  53 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  54 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  55 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  56 #define TAGMASK                 ((1 << 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, NetWMState,
  63        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  64        NetWMWindowTypeDialog, NetClientList, NetLast };     /* EWMH atoms */
  65 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  66 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  67        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  68
  69 typedef union {
  70         int i;
  71         unsigned int ui;
  72         float f;
  73         const void *v;
  74 } Arg;
  75
  76 typedef struct {
  77         unsigned int click;
  78         unsigned int mask;
  79         unsigned int button;
  80         void (*func)(const Arg *arg);
  81         const Arg arg;
  82 } Button;
  83
  84 typedef struct Monitor Monitor;
  85 typedef struct Client Client;
  86 struct Client {
  87         char name[256];
  88         float mina, maxa;
  89         int x, y, w, h;
  90         int oldx, oldy, oldw, oldh;
  91         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  92         int bw, oldbw;
  93         unsigned int tags;
  94         Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  95         Client *next;
  96         Client *snext;
  97         Monitor *mon;
  98         Window win;
  99 };
 100
 101 typedef struct {
 102         int x, y, w, h;
 103         unsigned long norm[ColLast];
 104         unsigned long sel[ColLast];
 105         Drawable drawable;
 106         GC gc;
 107         struct {
 108                 int ascent;
 109                 int descent;
 110                 int height;
 111                 XFontSet set;
 112                 XFontStruct *xfont;
 113         } font;
 114 } DC; /* draw context */
 115
 116 typedef struct {
 117         unsigned int mod;
 118         KeySym keysym;
 119         void (*func)(const Arg *);
 120         const Arg arg;
 121 } Key;
 122
 123 typedef struct {
 124         const char *symbol;
 125         void (*arrange)(Monitor *);
 126 } Layout;
 127
 128 struct Monitor {
 129         char ltsymbol[16];
 130         float mfact;
 131         int nmaster;
 132         int num;
 133         int by;               /* bar geometry */
 134         int mx, my, mw, mh;   /* screen size */
 135         int wx, wy, ww, wh;   /* window area  */
 136         unsigned int seltags;
 137         unsigned int sellt;
 138         unsigned int tagset[2];
 139         Bool showbar;
 140         Bool topbar;
 141         Client *clients;
 142         Client *sel;
 143         Client *stack;
 144         Monitor *next;
 145         Window barwin;
 146         const Layout *lt[2];
 147 };
 148
 149 typedef struct {
 150         const char *class;
 151         const char *instance;
 152         const char *title;
 153         unsigned int tags;
 154         Bool isfloating;
 155         int monitor;
 156 } Rule;
 157
 158 /* function declarations */
 159 static void applyrules(Client *c);
 160 static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 161 static void arrange(Monitor *m);
 162 static void arrangemon(Monitor *m);
 163 static void attach(Client *c);
 164 static void attachstack(Client *c);
 165 static void buttonpress(XEvent *e);
 166 static void checkotherwm(void);
 167 static void cleanup(void);
 168 static void cleanupmon(Monitor *mon);
 169 static void clearurgent(Client *c);
 170 static void clientmessage(XEvent *e);
 171 static void configure(Client *c);
 172 static void configurenotify(XEvent *e);
 173 static void configurerequest(XEvent *e);
 174 static Monitor *createmon(void);
 175 static void destroynotify(XEvent *e);
 176 static void detach(Client *c);
 177 static void detachstack(Client *c);
 178 static void die(const char *errstr, ...);
 179 static Monitor *dirtomon(int dir);
 180 static void drawbar(Monitor *m);
 181 static void drawbars(void);
 182 static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 183 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 184 static void enternotify(XEvent *e);
 185 static void expose(XEvent *e);
 186 static void focus(Client *c);
 187 static void focusin(XEvent *e);
 188 static void focusmon(const Arg *arg);
 189 static void focusstack(const Arg *arg);
 190 static unsigned long getcolor(const char *colstr);
 191 static Bool getrootptr(int *x, int *y);
 192 static long getstate(Window w);
 193 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 194 static void grabbuttons(Client *c, Bool focused);
 195 static void grabkeys(void);
 196 static void incnmaster(const Arg *arg);
 197 static void initfont(const char *fontstr);
 198 static void keypress(XEvent *e);
 199 static void killclient(const Arg *arg);
 200 static void manage(Window w, XWindowAttributes *wa);
 201 static void mappingnotify(XEvent *e);
 202 static void maprequest(XEvent *e);
 203 static void monocle(Monitor *m);
 204 static void motionnotify(XEvent *e);
 205 static void movemouse(const Arg *arg);
 206 static Client *nexttiled(Client *c);
 207 static void pop(Client *);
 208 static void propertynotify(XEvent *e);
 209 static void quit(const Arg *arg);
 210 static Monitor *recttomon(int x, int y, int w, int h);
 211 static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 212 static void resizeclient(Client *c, int x, int y, int w, int h);
 213 static void resizemouse(const Arg *arg);
 214 static void restack(Monitor *m);
 215 static void run(void);
 216 static void scan(void);
 217 static Bool sendevent(Client *c, Atom proto);
 218 static void sendmon(Client *c, Monitor *m);
 219 static void setclientstate(Client *c, long state);
 220 static void setfocus(Client *c);
 221 static void setfullscreen(Client *c, Bool fullscreen);
 222 static void setlayout(const Arg *arg);
 223 static void setmfact(const Arg *arg);
 224 static void setup(void);
 225 static void showhide(Client *c);
 226 static void sigchld(int unused);
 227 static void spawn(const Arg *arg);
 228 static void tag(const Arg *arg);
 229 static void tagmon(const Arg *arg);
 230 static int textnw(const char *text, unsigned int len);
 231 static void tile(Monitor *);
 232 static void togglebar(const Arg *arg);
 233 static void togglefloating(const Arg *arg);
 234 static void toggletag(const Arg *arg);
 235 static void toggleview(const Arg *arg);
 236 static void unfocus(Client *c, Bool setfocus);
 237 static void unmanage(Client *c, Bool destroyed);
 238 static void unmapnotify(XEvent *e);
 239 static void updategeom(void);
 240 static void updatebarpos(Monitor *m);
 241 static void updatebars(void);
 242 static void updateclientlist(void);
 243 static void updatenumlockmask(void);
 244 static void updatesizehints(Client *c);
 245 static void updatestatus(void);
 246 static void updatewindowtype(Client *c);
 247 static void updatetitle(Client *c);
 248 static void updatewmhints(Client *c);
 249 static void view(const Arg *arg);
 250 static Client *wintoclient(Window w);
 251 static Monitor *wintomon(Window w);
 252 static int xerror(Display *dpy, XErrorEvent *ee);
 253 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 254 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 255 static void zoom(const Arg *arg);
 256
 257 /* variables */
 258 static const char broken[] = "broken";
 259 static char stext[256];
 260 static int screen;
 261 static int sw, sh;           /* X display screen geometry width, height */
 262 static int bh, blw = 0;      /* bar geometry */
 263 static int (*xerrorxlib)(Display *, XErrorEvent *);
 264 static unsigned int numlockmask = 0;
 265 static void (*handler[LASTEvent]) (XEvent *) = {
 266         [ButtonPress] = buttonpress,
 267         [ClientMessage] = clientmessage,
 268         [ConfigureRequest] = configurerequest,
 269         [ConfigureNotify] = configurenotify,
 270         [DestroyNotify] = destroynotify,
 271         [EnterNotify] = enternotify,
 272         [Expose] = expose,
 273         [FocusIn] = focusin,
 274         [KeyPress] = keypress,
 275         [MappingNotify] = mappingnotify,
 276         [MapRequest] = maprequest,
 277         [MotionNotify] = motionnotify,
 278         [PropertyNotify] = propertynotify,
 279         [UnmapNotify] = unmapnotify
 280 };
 281 static Atom wmatom[WMLast], netatom[NetLast];
 282 static Bool running = True;
 283 static Cursor cursor[CurLast];
 284 static Display *dpy;
 285 static DC dc;
 286 static Monitor *mons = NULL, *selmon = NULL;
 287 static Window root;
 288
 289 /* configuration, allows nested code to access above variables */
 290 #include "config.h"
 291
 292 /* compile-time check if all tags fit into an unsigned int bit array. */
 293 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 294
 295 /* function implementations */
 296 void
 297 applyrules(Client *c) {
 298         const char *class, *instance;
 299         unsigned int i;
 300         const Rule *r;
 301         Monitor *m;
 302         XClassHint ch = { NULL, NULL };
 303
 304         /* rule matching */
 305         c->isfloating = c->tags = 0;
 306         XGetClassHint(dpy, c->win, &ch);
 307         class    = ch.res_class ? ch.res_class : broken;
 308         instance = ch.res_name  ? ch.res_name  : broken;
 309
 310         for(i = 0; i < LENGTH(rules); i++) {
 311                 r = &rules[i];
 312                 if((!r->title || strstr(c->name, r->title))
 313                 && (!r->class || strstr(class, r->class))
 314                 && (!r->instance || strstr(instance, r->instance)))
 315                 {
 316                         c->isfloating = r->isfloating;
 317                         c->tags |= r->tags;
 318                         for(m = mons; m && m->num != r->monitor; m = m->next);
 319                         if(m)
 320                                 c->mon = m;
 321                 }
 322         }
 323         if(ch.res_class)
 324                 XFree(ch.res_class);
 325         if(ch.res_name)
 326                 XFree(ch.res_name);
 327         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 328 }
 329
 330 Bool
 331 applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 332         Bool baseismin;
 333         Monitor *m = c->mon;
 334
 335         /* set minimum possible */
 336         *w = MAX(1, *w);
 337         *h = MAX(1, *h);
 338         if(interact) {
 339                 if(*x > sw)
 340                         *x = sw - WIDTH(c);
 341                 if(*y > sh)
 342                         *y = sh - HEIGHT(c);
 343                 if(*x + *w + 2 * c->bw < 0)
 344                         *x = 0;
 345                 if(*y + *h + 2 * c->bw < 0)
 346                         *y = 0;
 347         }
 348         else {
 349                 if(*x >= m->wx + m->ww)
 350                         *x = m->wx + m->ww - WIDTH(c);
 351                 if(*y >= m->wy + m->wh)
 352                         *y = m->wy + m->wh - HEIGHT(c);
 353                 if(*x + *w + 2 * c->bw <= m->wx)
 354                         *x = m->wx;
 355                 if(*y + *h + 2 * c->bw <= m->wy)
 356                         *y = m->wy;
 357         }
 358         if(*h < bh)
 359                 *h = bh;
 360         if(*w < bh)
 361                 *w = bh;
 362         if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 363                 /* see last two sentences in ICCCM 4.1.2.3 */
 364                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 365                 if(!baseismin) { /* temporarily remove base dimensions */
 366                         *w -= c->basew;
 367                         *h -= c->baseh;
 368                 }
 369                 /* adjust for aspect limits */
 370                 if(c->mina > 0 && c->maxa > 0) {
 371                         if(c->maxa < (float)*w / *h)
 372                                 *w = *h * c->maxa + 0.5;
 373                         else if(c->mina < (float)*h / *w)
 374                                 *h = *w * c->mina + 0.5;
 375                 }
 376                 if(baseismin) { /* increment calculation requires this */
 377                         *w -= c->basew;
 378                         *h -= c->baseh;
 379                 }
 380                 /* adjust for increment value */
 381                 if(c->incw)
 382                         *w -= *w % c->incw;
 383                 if(c->inch)
 384                         *h -= *h % c->inch;
 385                 /* restore base dimensions */
 386                 *w = MAX(*w + c->basew, c->minw);
 387                 *h = MAX(*h + c->baseh, c->minh);
 388                 if(c->maxw)
 389                         *w = MIN(*w, c->maxw);
 390                 if(c->maxh)
 391                         *h = MIN(*h, c->maxh);
 392         }
 393         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 394 }
 395
 396 void
 397 arrange(Monitor *m) {
 398         if(m)
 399                 showhide(m->stack);
 400         else for(m = mons; m; m = m->next)
 401                 showhide(m->stack);
 402         if(m) {
 403                 arrangemon(m);
 404                 restack(m);
 405         } else for(m = mons; m; m = m->next)
 406                 arrangemon(m);
 407 }
 408
 409 void
 410 arrangemon(Monitor *m) {
 411         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 412         if(m->lt[m->sellt]->arrange)
 413                 m->lt[m->sellt]->arrange(m);
 414 }
 415
 416 void
 417 attach(Client *c) {
 418         c->next = c->mon->clients;
 419         c->mon->clients = c;
 420 }
 421
 422 void
 423 attachstack(Client *c) {
 424         c->snext = c->mon->stack;
 425         c->mon->stack = c;
 426 }
 427
 428 void
 429 buttonpress(XEvent *e) {
 430         unsigned int i, x, click;
 431         Arg arg = {0};
 432         Client *c;
 433         Monitor *m;
 434         XButtonPressedEvent *ev = &e->xbutton;
 435
 436         click = ClkRootWin;
 437         /* focus monitor if necessary */
 438         if((m = wintomon(ev->window)) && m != selmon) {
 439                 unfocus(selmon->sel, True);
 440                 selmon = m;
 441                 focus(NULL);
 442         }
 443         if(ev->window == selmon->barwin) {
 444                 i = x = 0;
 445                 do
 446                         x += TEXTW(tags[i]);
 447                 while(ev->x >= x && ++i < LENGTH(tags));
 448                 if(i < LENGTH(tags)) {
 449                         click = ClkTagBar;
 450                         arg.ui = 1 << i;
 451                 }
 452                 else if(ev->x < x + blw)
 453                         click = ClkLtSymbol;
 454                 else if(ev->x > selmon->ww - TEXTW(stext))
 455                         click = ClkStatusText;
 456                 else
 457                         click = ClkWinTitle;
 458         }
 459         else if((c = wintoclient(ev->window))) {
 460                 focus(c);
 461                 click = ClkClientWin;
 462         }
 463         for(i = 0; i < LENGTH(buttons); i++)
 464                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 465                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 466                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 467 }
 468
 469 void
 470 checkotherwm(void) {
 471         xerrorxlib = XSetErrorHandler(xerrorstart);
 472         /* this causes an error if some other window manager is running */
 473         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 474         XSync(dpy, False);
 475         XSetErrorHandler(xerror);
 476         XSync(dpy, False);
 477 }
 478
 479 void
 480 cleanup(void) {
 481         Arg a = {.ui = ~0};
 482         Layout foo = { "", NULL };
 483         Monitor *m;
 484
 485         view(&a);
 486         selmon->lt[selmon->sellt] = &foo;
 487         for(m = mons; m; m = m->next)
 488                 while(m->stack)
 489                         unmanage(m->stack, False);
 490         if(dc.font.set)
 491                 XFreeFontSet(dpy, dc.font.set);
 492         else
 493                 XFreeFont(dpy, dc.font.xfont);
 494         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 495         XFreePixmap(dpy, dc.drawable);
 496         XFreeGC(dpy, dc.gc);
 497         XFreeCursor(dpy, cursor[CurNormal]);
 498         XFreeCursor(dpy, cursor[CurResize]);
 499         XFreeCursor(dpy, cursor[CurMove]);
 500         while(mons)
 501                 cleanupmon(mons);
 502         XSync(dpy, False);
 503         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 504         XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 505 }
 506
 507 void
 508 cleanupmon(Monitor *mon) {
 509         Monitor *m;
 510
 511         if(mon == mons)
 512                 mons = mons->next;
 513         else {
 514                 for(m = mons; m && m->next != mon; m = m->next);
 515                 m->next = mon->next;
 516         }
 517         XUnmapWindow(dpy, mon->barwin);
 518         XDestroyWindow(dpy, mon->barwin);
 519         free(mon);
 520 }
 521
 522 void
 523 clearurgent(Client *c) {
 524         XWMHints *wmh;
 525
 526         c->isurgent = False;
 527         if(!(wmh = XGetWMHints(dpy, c->win)))
 528                 return;
 529         wmh->flags &= ~XUrgencyHint;
 530         XSetWMHints(dpy, c->win, wmh);
 531         XFree(wmh);
 532 }
 533
 534 void
 535 clientmessage(XEvent *e) {
 536         XClientMessageEvent *cme = &e->xclient;
 537         Client *c = wintoclient(cme->window);
 538
 539         if(!c)
 540                 return;
 541         if(cme->message_type == netatom[NetWMState]) {
 542                 if(cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 543                         setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 544                                       || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 545         }
 546         else if(cme->message_type == netatom[NetActiveWindow]) {
 547                 if(!ISVISIBLE(c)) {
 548                         c->mon->seltags ^= 1;
 549                         c->mon->tagset[c->mon->seltags] = c->tags;
 550                 }
 551                 pop(c);
 552         }
 553 }
 554
 555 void
 556 configure(Client *c) {
 557         XConfigureEvent ce;
 558
 559         ce.type = ConfigureNotify;
 560         ce.display = dpy;
 561         ce.event = c->win;
 562         ce.window = c->win;
 563         ce.x = c->x;
 564         ce.y = c->y;
 565         ce.width = c->w;
 566         ce.height = c->h;
 567         ce.border_width = c->bw;
 568         ce.above = None;
 569         ce.override_redirect = False;
 570         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 571 }
 572
 573 void
 574 configurenotify(XEvent *e) {
 575         Monitor *m;
 576         XConfigureEvent *ev = &e->xconfigure;
 577
 578         if(ev->window == root) {
 579                 sw = ev->width;
 580                 sh = ev->height;
 581                 if(dc.drawable != 0)
 582                         XFreePixmap(dpy, dc.drawable);
 583                 dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 584                 updatebars();
 585                 for(m = mons; m; m = m->next)
 586                         XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 587                 focus(NULL);
 588                 arrange(NULL);
 589         }
 590 }
 591
 592 void
 593 configurerequest(XEvent *e) {
 594         Client *c;
 595         Monitor *m;
 596         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 597         XWindowChanges wc;
 598
 599         if((c = wintoclient(ev->window))) {
 600                 if(ev->value_mask & CWBorderWidth)
 601                         c->bw = ev->border_width;
 602                 else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 603                         m = c->mon;
 604                         if(ev->value_mask & CWX) {
 605                                 c->oldx = c->x;
 606                                 c->x = m->mx + ev->x;
 607                         }
 608                         if(ev->value_mask & CWY) {
 609                                 c->oldy = c->y;
 610                                 c->y = m->my + ev->y;
 611                         }
 612                         if(ev->value_mask & CWWidth) {
 613                                 c->oldw = c->w;
 614                                 c->w = ev->width;
 615                         }
 616                         if(ev->value_mask & CWHeight) {
 617                                 c->oldh = c->h;
 618                                 c->h = ev->height;
 619                         }
 620                         if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 621                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 622                         if((c->y + c->h) > m->my + m->mh && c->isfloating)
 623                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 624                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 625                                 configure(c);
 626                         if(ISVISIBLE(c))
 627                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 628                 }
 629                 else
 630                         configure(c);
 631         }
 632         else {
 633                 wc.x = ev->x;
 634                 wc.y = ev->y;
 635                 wc.width = ev->width;
 636                 wc.height = ev->height;
 637                 wc.border_width = ev->border_width;
 638                 wc.sibling = ev->above;
 639                 wc.stack_mode = ev->detail;
 640                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 641         }
 642         XSync(dpy, False);
 643 }
 644
 645 Monitor *
 646 createmon(void) {
 647         Monitor *m;
 648
 649         if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 650                 die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 651         m->tagset[0] = m->tagset[1] = 1;
 652         m->mfact = mfact;
 653         m->nmaster = nmaster;
 654         m->showbar = showbar;
 655         m->topbar = topbar;
 656         m->lt[0] = &layouts[0];
 657         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 658         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 659         return m;
 660 }
 661
 662 void
 663 destroynotify(XEvent *e) {
 664         Client *c;
 665         XDestroyWindowEvent *ev = &e->xdestroywindow;
 666
 667         if((c = wintoclient(ev->window)))
 668                 unmanage(c, True);
 669 }
 670
 671 void
 672 detach(Client *c) {
 673         Client **tc;
 674
 675         for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 676         *tc = c->next;
 677 }
 678
 679 void
 680 detachstack(Client *c) {
 681         Client **tc, *t;
 682
 683         for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 684         *tc = c->snext;
 685
 686         if(c == c->mon->sel) {
 687                 for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 688                 c->mon->sel = t;
 689         }
 690 }
 691
 692 void
 693 die(const char *errstr, ...) {
 694         va_list ap;
 695
 696         va_start(ap, errstr);
 697         vfprintf(stderr, errstr, ap);
 698         va_end(ap);
 699         exit(EXIT_FAILURE);
 700 }
 701
 702 Monitor *
 703 dirtomon(int dir) {
 704         Monitor *m = NULL;
 705
 706         if(dir > 0) {
 707                 if(!(m = selmon->next))
 708                         m = mons;
 709         }
 710         else if(selmon == mons)
 711                 for(m = mons; m->next; m = m->next);
 712         else
 713                 for(m = mons; m->next != selmon; m = m->next);
 714         return m;
 715 }
 716
 717 void
 718 drawbar(Monitor *m) {
 719         int x;
 720         unsigned int i, occ = 0, urg = 0;
 721         unsigned long *col;
 722         Client *c;
 723
 724         for(c = m->clients; c; c = c->next) {
 725                 occ |= c->tags;
 726                 if(c->isurgent)
 727                         urg |= c->tags;
 728         }
 729         dc.x = 0;
 730         for(i = 0; i < LENGTH(tags); i++) {
 731                 dc.w = TEXTW(tags[i]);
 732                 col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 733                 drawtext(tags[i], col, urg & 1 << i);
 734                 drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 735                            occ & 1 << i, urg & 1 << i, col);
 736                 dc.x += dc.w;
 737         }
 738         dc.w = blw = TEXTW(m->ltsymbol);
 739         drawtext(m->ltsymbol, dc.norm, False);
 740         dc.x += dc.w;
 741         x = dc.x;
 742         if(m == selmon) { /* status is only drawn on selected monitor */
 743                 dc.w = TEXTW(stext);
 744                 dc.x = m->ww - dc.w;
 745                 if(dc.x < x) {
 746                         dc.x = x;
 747                         dc.w = m->ww - x;
 748                 }
 749                 drawtext(stext, dc.norm, False);
 750         }
 751         else
 752                 dc.x = m->ww;
 753         if((dc.w = dc.x - x) > bh) {
 754                 dc.x = x;
 755                 if(m->sel) {
 756                         col = m == selmon ? dc.sel : dc.norm;
 757                         drawtext(m->sel->name, col, False);
 758                         drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 759                 }
 760                 else
 761                         drawtext(NULL, dc.norm, False);
 762         }
 763         XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 764         XSync(dpy, False);
 765 }
 766
 767 void
 768 drawbars(void) {
 769         Monitor *m;
 770
 771         for(m = mons; m; m = m->next)
 772                 drawbar(m);
 773 }
 774
 775 void
 776 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 777         int x;
 778
 779         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 780         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 781         if(filled)
 782                 XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 783         else if(empty)
 784                 XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 785 }
 786
 787 void
 788 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 789         char buf[256];
 790         int i, x, y, h, len, olen;
 791
 792         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 793         XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 794         if(!text)
 795                 return;
 796         olen = strlen(text);
 797         h = dc.font.ascent + dc.font.descent;
 798         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 799         x = dc.x + (h / 2);
 800         /* shorten text if necessary */
 801         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 802         if(!len)
 803                 return;
 804         memcpy(buf, text, len);
 805         if(len < olen)
 806                 for(i = len; i && i > len - 3; buf[--i] = '.');
 807         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 808         if(dc.font.set)
 809                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 810         else
 811                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 812 }
 813
 814 void
 815 enternotify(XEvent *e) {
 816         Client *c;
 817         Monitor *m;
 818         XCrossingEvent *ev = &e->xcrossing;
 819
 820         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 821                 return;
 822         c = wintoclient(ev->window);
 823         m = c ? c->mon : wintomon(ev->window);
 824         if(m != selmon) {
 825                 unfocus(selmon->sel, True);
 826                 selmon = m;
 827         }
 828         else if(!c || c == selmon->sel)
 829                 return;
 830         focus(c);
 831 }
 832
 833 void
 834 expose(XEvent *e) {
 835         Monitor *m;
 836         XExposeEvent *ev = &e->xexpose;
 837
 838         if(ev->count == 0 && (m = wintomon(ev->window)))
 839                 drawbar(m);
 840 }
 841
 842 void
 843 focus(Client *c) {
 844         if(!c || !ISVISIBLE(c))
 845                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 846         /* was if(selmon->sel) */
 847         if(selmon->sel && selmon->sel != c)
 848                 unfocus(selmon->sel, False);
 849         if(c) {
 850                 if(c->mon != selmon)
 851                         selmon = c->mon;
 852                 if(c->isurgent)
 853                         clearurgent(c);
 854                 detachstack(c);
 855                 attachstack(c);
 856                 grabbuttons(c, True);
 857                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 858                 setfocus(c);
 859         }
 860         else {
 861                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 862                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 863         }
 864         selmon->sel = c;
 865         drawbars();
 866 }
 867
 868 void
 869 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 870         XFocusChangeEvent *ev = &e->xfocus;
 871
 872         if(selmon->sel && ev->window != selmon->sel->win)
 873                 setfocus(selmon->sel);
 874 }
 875
 876 void
 877 focusmon(const Arg *arg) {
 878         Monitor *m;
 879
 880         if(!mons->next)
 881                 return;
 882         if((m = dirtomon(arg->i)) == selmon)
 883                 return;
 884         unfocus(selmon->sel, False); /* s/True/False/ fixes input focus issues
 885                                         in gedit and anjuta */
 886         selmon = m;
 887         focus(NULL);
 888 }
 889
 890 void
 891 focusstack(const Arg *arg) {
 892         Client *c = NULL, *i;
 893
 894         if(!selmon->sel)
 895                 return;
 896         if(arg->i > 0) {
 897                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 898                 if(!c)
 899                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 900         }
 901         else {
 902                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 903                         if(ISVISIBLE(i))
 904                                 c = i;
 905                 if(!c)
 906                         for(; i; i = i->next)
 907                                 if(ISVISIBLE(i))
 908                                         c = i;
 909         }
 910         if(c) {
 911                 focus(c);
 912                 restack(selmon);
 913         }
 914 }
 915
 916 Atom
 917 getatomprop(Client *c, Atom prop) {
 918         int di;
 919         unsigned long dl;
 920         unsigned char *p = NULL;
 921         Atom da, atom = None;
 922
 923         if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 924                               &da, &di, &dl, &dl, &p) == Success && p) {
 925                 atom = *(Atom *)p;
 926                 XFree(p);
 927         }
 928         return atom;
 929 }
 930
 931 unsigned long
 932 getcolor(const char *colstr) {
 933         Colormap cmap = DefaultColormap(dpy, screen);
 934         XColor color;
 935
 936         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 937                 die("error, cannot allocate color '%s'\n", colstr);
 938         return color.pixel;
 939 }
 940
 941 Bool
 942 getrootptr(int *x, int *y) {
 943         int di;
 944         unsigned int dui;
 945         Window dummy;
 946
 947         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 948 }
 949
 950 long
 951 getstate(Window w) {
 952         int format;
 953         long result = -1;
 954         unsigned char *p = NULL;
 955         unsigned long n, extra;
 956         Atom real;
 957
 958         if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 959                               &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 960                 return -1;
 961         if(n != 0)
 962                 result = *p;
 963         XFree(p);
 964         return result;
 965 }
 966
 967 Bool
 968 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 969         char **list = NULL;
 970         int n;
 971         XTextProperty name;
 972
 973         if(!text || size == 0)
 974                 return False;
 975         text[0] = '\0';
 976         XGetTextProperty(dpy, w, &name, atom);
 977         if(!name.nitems)
 978                 return False;
 979         if(name.encoding == XA_STRING)
 980                 strncpy(text, (char *)name.value, size - 1);
 981         else {
 982                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 983                         strncpy(text, *list, size - 1);
 984                         XFreeStringList(list);
 985                 }
 986         }
 987         text[size - 1] = '\0';
 988         XFree(name.value);
 989         return True;
 990 }
 991
 992 void
 993 grabbuttons(Client *c, Bool focused) {
 994         updatenumlockmask();
 995         {
 996                 unsigned int i, j;
 997                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 998                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 999                 if(focused) {
1000                         for(i = 0; i < LENGTH(buttons); i++)
1001                                 if(buttons[i].click == ClkClientWin)
1002                                         for(j = 0; j < LENGTH(modifiers); j++)
1003                                                 XGrabButton(dpy, buttons[i].button,
1004                                                             buttons[i].mask | modifiers[j],
1005                                                             c->win, False, BUTTONMASK,
1006                                                             GrabModeAsync, GrabModeSync, None, None);
1007                 }
1008                 else
1009                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1010                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1011         }
1012 }
1013
1014 void
1015 grabkeys(void) {
1016         updatenumlockmask();
1017         {
1018                 unsigned int i, j;
1019                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1020                 KeyCode code;
1021
1022                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1023                 for(i = 0; i < LENGTH(keys); i++)
1024                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1025                                 for(j = 0; j < LENGTH(modifiers); j++)
1026                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1027                                                  True, GrabModeAsync, GrabModeAsync);
1028         }
1029 }
1030
1031 void
1032 incnmaster(const Arg *arg) {
1033         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1034         arrange(selmon);
1035 }
1036
1037 void
1038 initfont(const char *fontstr) {
1039         char *def, **missing;
1040         int n;
1041
1042         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1043         if(missing) {
1044                 while(n--)
1045                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1046                 XFreeStringList(missing);
1047         }
1048         if(dc.font.set) {
1049                 XFontStruct **xfonts;
1050                 char **font_names;
1051
1052                 dc.font.ascent = dc.font.descent = 0;
1053                 XExtentsOfFontSet(dc.font.set);
1054                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1055                 while(n--) {
1056                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1057                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1058                         xfonts++;
1059                 }
1060         }
1061         else {
1062                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1063                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1064                         die("error, cannot load font: '%s'\n", fontstr);
1065                 dc.font.ascent = dc.font.xfont->ascent;
1066                 dc.font.descent = dc.font.xfont->descent;
1067         }
1068         dc.font.height = dc.font.ascent + dc.font.descent;
1069 }
1070
1071 #ifdef XINERAMA
1072 static Bool
1073 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1074         while(n--)
1075                 /* treat origin (x, y) as fixpoint for uniqueness only, first screen wins */
1076                 if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org)
1077                         return False;
1078         return True;
1079 }
1080 #endif /* XINERAMA */
1081
1082 void
1083 keypress(XEvent *e) {
1084         unsigned int i;
1085         KeySym keysym;
1086         XKeyEvent *ev;
1087
1088         ev = &e->xkey;
1089         keysym = XkbKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0, 0);
1090         for(i = 0; i < LENGTH(keys); i++)
1091                 if(keysym == keys[i].keysym
1092                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1093                 && keys[i].func)
1094                         keys[i].func(&(keys[i].arg));
1095 }
1096
1097 void
1098 killclient(const Arg *arg) {
1099         if(!selmon->sel)
1100                 return;
1101         if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1102                 XGrabServer(dpy);
1103                 XSetErrorHandler(xerrordummy);
1104                 XSetCloseDownMode(dpy, DestroyAll);
1105                 XKillClient(dpy, selmon->sel->win);
1106                 XSync(dpy, False);
1107                 XSetErrorHandler(xerror);
1108                 XUngrabServer(dpy);
1109         }
1110 }
1111
1112 void
1113 manage(Window w, XWindowAttributes *wa) {
1114         Client *c, *t = NULL;
1115         Window trans = None;
1116         XWindowChanges wc;
1117
1118         if(!(c = calloc(1, sizeof(Client))))
1119                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1120         c->win = w;
1121         updatetitle(c);
1122         if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1123                 c->mon = t->mon;
1124                 c->tags = t->tags;
1125         }
1126         else {
1127                 c->mon = selmon;
1128                 applyrules(c);
1129         }
1130         /* geometry */
1131         c->x = c->oldx = wa->x;
1132         c->y = c->oldy = wa->y;
1133         c->w = c->oldw = wa->width;
1134         c->h = c->oldh = wa->height;
1135         c->oldbw = wa->border_width;
1136
1137         if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1138                 c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1139         if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1140                 c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1141         c->x = MAX(c->x, c->mon->mx);
1142         /* only fix client y-offset, if the client center might cover the bar */
1143         c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1144                    && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1145         c->bw = borderpx;
1146
1147         wc.border_width = c->bw;
1148         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1149         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1150         configure(c); /* propagates border_width, if size doesn't change */
1151         updatewindowtype(c);
1152         updatesizehints(c);
1153         updatewmhints(c);
1154         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1155         grabbuttons(c, False);
1156         if(!c->isfloating)
1157                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1158         if(c->isfloating)
1159                 XRaiseWindow(dpy, c->win);
1160         attach(c);
1161         attachstack(c);
1162         XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1163                         (unsigned char *) &(c->win), 1);
1164         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1165         setclientstate(c, NormalState);
1166         if (c->mon == selmon)
1167                 unfocus(selmon->sel, False);
1168         c->mon->sel = c;
1169         arrange(c->mon);
1170         XMapWindow(dpy, c->win);
1171         focus(NULL);
1172 }
1173
1174 void
1175 mappingnotify(XEvent *e) {
1176         XMappingEvent *ev = &e->xmapping;
1177
1178         XRefreshKeyboardMapping(ev);
1179         if(ev->request == MappingKeyboard)
1180                 grabkeys();
1181 }
1182
1183 void
1184 maprequest(XEvent *e) {
1185         static XWindowAttributes wa;
1186         XMapRequestEvent *ev = &e->xmaprequest;
1187
1188         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1189                 return;
1190         if(wa.override_redirect)
1191                 return;
1192         if(!wintoclient(ev->window))
1193                 manage(ev->window, &wa);
1194 }
1195
1196 void
1197 monocle(Monitor *m) {
1198         unsigned int n = 0;
1199         Client *c;
1200
1201         for(c = m->clients; c; c = c->next)
1202                 if(ISVISIBLE(c))
1203                         n++;
1204         if(n > 0) /* override layout symbol */
1205                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1206         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1207                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1208 }
1209
1210 void
1211 motionnotify(XEvent *e) {
1212         static Monitor *mon = NULL;
1213         Monitor *m;
1214         XMotionEvent *ev = &e->xmotion;
1215
1216         if(ev->window != root)
1217                 return;
1218         if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1219                 unfocus(selmon->sel, True);
1220                 selmon = m;
1221                 focus(NULL);
1222         }
1223         mon = m;
1224 }
1225
1226 void
1227 movemouse(const Arg *arg) {
1228         int x, y, ocx, ocy, nx, ny;
1229         Client *c;
1230         Monitor *m;
1231         XEvent ev;
1232
1233         if(!(c = selmon->sel))
1234                 return;
1235         if(c->isfullscreen) /* no support moving fullscreen windows by mouse */
1236                 return;
1237         restack(selmon);
1238         ocx = c->x;
1239         ocy = c->y;
1240         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1241         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1242                 return;
1243         if(!getrootptr(&x, &y))
1244                 return;
1245         do {
1246                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1247                 switch(ev.type) {
1248                 case ConfigureRequest:
1249                 case Expose:
1250                 case MapRequest:
1251                         handler[ev.type](&ev);
1252                         break;
1253                 case MotionNotify:
1254                         nx = ocx + (ev.xmotion.x - x);
1255                         ny = ocy + (ev.xmotion.y - y);
1256                         if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1257                         && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1258                                 if(abs(selmon->wx - nx) < snap)
1259                                         nx = selmon->wx;
1260                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1261                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1262                                 if(abs(selmon->wy - ny) < snap)
1263                                         ny = selmon->wy;
1264                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1265                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1266                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1267                                 && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1268                                         togglefloating(NULL);
1269                         }
1270                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1271                                 resize(c, nx, ny, c->w, c->h, True);
1272                         break;
1273                 }
1274         } while(ev.type != ButtonRelease);
1275         XUngrabPointer(dpy, CurrentTime);
1276         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1277                 sendmon(c, m);
1278                 selmon = m;
1279                 focus(NULL);
1280         }
1281 }
1282
1283 Client *
1284 nexttiled(Client *c) {
1285         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1286         return c;
1287 }
1288
1289 void
1290 pop(Client *c) {
1291         detach(c);
1292         attach(c);
1293         focus(c);
1294         arrange(c->mon);
1295 }
1296
1297 void
1298 propertynotify(XEvent *e) {
1299         Client *c;
1300         Window trans;
1301         XPropertyEvent *ev = &e->xproperty;
1302
1303         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1304                 updatestatus();
1305         else if(ev->state == PropertyDelete)
1306                 return; /* ignore */
1307         else if((c = wintoclient(ev->window))) {
1308                 switch(ev->atom) {
1309                 default: break;
1310                 case XA_WM_TRANSIENT_FOR:
1311                         if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1312                            (c->isfloating = (wintoclient(trans)) != NULL))
1313                                 arrange(c->mon);
1314                         break;
1315                 case XA_WM_NORMAL_HINTS:
1316                         updatesizehints(c);
1317                         break;
1318                 case XA_WM_HINTS:
1319                         updatewmhints(c);
1320                         drawbars();
1321                         break;
1322                 }
1323                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1324                         updatetitle(c);
1325                         if(c == c->mon->sel)
1326                                 drawbar(c->mon);
1327                 }
1328                 if(ev->atom == netatom[NetWMWindowType])
1329                         updatewindowtype(c);
1330         }
1331 }
1332
1333 void
1334 quit(const Arg *arg) {
1335         running = False;
1336 }
1337
1338 Monitor *
1339 recttomon(int x, int y, int w, int h) {
1340         Monitor *m, *r = selmon;
1341         int a, area = 0;
1342
1343         for(m = mons; m; m = m->next)
1344                 if((a = INTERSECT(x, y, w, h, m)) > area) {
1345                         area = a;
1346                         r = m;
1347                 }
1348         return r;
1349 }
1350
1351 void
1352 resize(Client *c, int x, int y, int w, int h, Bool interact) {
1353         if(applysizehints(c, &x, &y, &w, &h, interact))
1354                 resizeclient(c, x, y, w, h);
1355 }
1356
1357 void
1358 resizeclient(Client *c, int x, int y, int w, int h) {
1359         XWindowChanges wc;
1360
1361         c->oldx = c->x; c->x = wc.x = x;
1362         c->oldy = c->y; c->y = wc.y = y;
1363         c->oldw = c->w; c->w = wc.width = w;
1364         c->oldh = c->h; c->h = wc.height = h;
1365         wc.border_width = c->bw;
1366         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1367         configure(c);
1368         XSync(dpy, False);
1369 }
1370
1371 void
1372 resizemouse(const Arg *arg) {
1373         int ocx, ocy;
1374         int nw, nh;
1375         Client *c;
1376         Monitor *m;
1377         XEvent ev;
1378
1379         if(!(c = selmon->sel))
1380                 return;
1381         if(c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1382                 return;
1383         restack(selmon);
1384         ocx = c->x;
1385         ocy = c->y;
1386         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1387                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1388                 return;
1389         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1390         do {
1391                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1392                 switch(ev.type) {
1393                 case ConfigureRequest:
1394                 case Expose:
1395                 case MapRequest:
1396                         handler[ev.type](&ev);
1397                         break;
1398                 case MotionNotify:
1399                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1400                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1401                         if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1402                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1403                         {
1404                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1405                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1406                                         togglefloating(NULL);
1407                         }
1408                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1409                                 resize(c, c->x, c->y, nw, nh, True);
1410                         break;
1411                 }
1412         } while(ev.type != ButtonRelease);
1413         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1414         XUngrabPointer(dpy, CurrentTime);
1415         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1416         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1417                 sendmon(c, m);
1418                 selmon = m;
1419                 focus(NULL);
1420         }
1421 }
1422
1423 void
1424 restack(Monitor *m) {
1425         Client *c;
1426         XEvent ev;
1427         XWindowChanges wc;
1428
1429         drawbar(m);
1430         if(!m->sel)
1431                 return;
1432         if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1433                 XRaiseWindow(dpy, m->sel->win);
1434         if(m->lt[m->sellt]->arrange) {
1435                 wc.stack_mode = Below;
1436                 wc.sibling = m->barwin;
1437                 for(c = m->stack; c; c = c->snext)
1438                         if(!c->isfloating && ISVISIBLE(c)) {
1439                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1440                                 wc.sibling = c->win;
1441                         }
1442         }
1443         XSync(dpy, False);
1444         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1445 }
1446
1447 void
1448 run(void) {
1449         XEvent ev;
1450         /* main event loop */
1451         XSync(dpy, False);
1452         while(running && !XNextEvent(dpy, &ev))
1453                 if(handler[ev.type])
1454                         handler[ev.type](&ev); /* call handler */
1455 }
1456
1457 void
1458 scan(void) {
1459         unsigned int i, num;
1460         Window d1, d2, *wins = NULL;
1461         XWindowAttributes wa;
1462
1463         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1464                 for(i = 0; i < num; i++) {
1465                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1466                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1467                                 continue;
1468                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1469                                 manage(wins[i], &wa);
1470                 }
1471                 for(i = 0; i < num; i++) { /* now the transients */
1472                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1473                                 continue;
1474                         if(XGetTransientForHint(dpy, wins[i], &d1)
1475                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1476                                 manage(wins[i], &wa);
1477                 }
1478                 if(wins)
1479                         XFree(wins);
1480         }
1481 }
1482
1483 void
1484 sendmon(Client *c, Monitor *m) {
1485         if(c->mon == m)
1486                 return;
1487         unfocus(c, True);
1488         detach(c);
1489         detachstack(c);
1490         c->mon = m;
1491         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1492         attach(c);
1493         attachstack(c);
1494         focus(NULL);
1495         arrange(NULL);
1496 }
1497
1498 void
1499 setclientstate(Client *c, long state) {
1500         long data[] = { state, None };
1501
1502         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1503                         PropModeReplace, (unsigned char *)data, 2);
1504 }
1505
1506 Bool
1507 sendevent(Client *c, Atom proto) {
1508         int n;
1509         Atom *protocols;
1510         Bool exists = False;
1511         XEvent ev;
1512
1513         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1514                 while(!exists && n--)
1515                         exists = protocols[n] == proto;
1516                 XFree(protocols);
1517         }
1518         if(exists) {
1519                 ev.type = ClientMessage;
1520                 ev.xclient.window = c->win;
1521                 ev.xclient.message_type = wmatom[WMProtocols];
1522                 ev.xclient.format = 32;
1523                 ev.xclient.data.l[0] = proto;
1524                 ev.xclient.data.l[1] = CurrentTime;
1525                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1526         }
1527         return exists;
1528 }
1529
1530 void
1531 setfocus(Client *c) {
1532         if(!c->neverfocus) {
1533                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1534                 XChangeProperty(dpy, root, netatom[NetActiveWindow],
1535                                 XA_WINDOW, 32, PropModeReplace,
1536                                 (unsigned char *) &(c->win), 1);
1537         }
1538         sendevent(c, wmatom[WMTakeFocus]);
1539 }
1540
1541 void
1542 setfullscreen(Client *c, Bool fullscreen) {
1543         if(fullscreen) {
1544                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1545                                 PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1546                 c->isfullscreen = True;
1547                 c->oldstate = c->isfloating;
1548                 c->oldbw = c->bw;
1549                 c->bw = 0;
1550                 c->isfloating = True;
1551                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1552                 XRaiseWindow(dpy, c->win);
1553         }
1554         else {
1555                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1556                                 PropModeReplace, (unsigned char*)0, 0);
1557                 c->isfullscreen = False;
1558                 c->isfloating = c->oldstate;
1559                 c->bw = c->oldbw;
1560                 c->x = c->oldx;
1561                 c->y = c->oldy;
1562                 c->w = c->oldw;
1563                 c->h = c->oldh;
1564                 resizeclient(c, c->x, c->y, c->w, c->h);
1565                 arrange(c->mon);
1566         }
1567 }
1568
1569 void
1570 setlayout(const Arg *arg) {
1571         if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1572                 selmon->sellt ^= 1;
1573         if(arg && arg->v)
1574                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1575         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1576         if(selmon->sel)
1577                 arrange(selmon);
1578         else
1579                 drawbar(selmon);
1580 }
1581
1582 /* arg > 1.0 will set mfact absolutly */
1583 void
1584 setmfact(const Arg *arg) {
1585         float f;
1586
1587         if(!arg || !selmon->lt[selmon->sellt]->arrange)
1588                 return;
1589         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1590         if(f < 0.1 || f > 0.9)
1591                 return;
1592         selmon->mfact = f;
1593         arrange(selmon);
1594 }
1595
1596 void
1597 setup(void) {
1598         XSetWindowAttributes wa;
1599
1600         /* clean up any zombies immediately */
1601         sigchld(0);
1602
1603         /* init screen */
1604         screen = DefaultScreen(dpy);
1605         root = RootWindow(dpy, screen);
1606         initfont(font);
1607         sw = DisplayWidth(dpy, screen);
1608         sh = DisplayHeight(dpy, screen);
1609         bh = dc.h = dc.font.height + 2;
1610         updategeom();
1611         /* init atoms */
1612         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1613         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1614         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1615         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1616         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1617         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1618         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1619         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1620         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1621         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1622         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1623         netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1624         /* init cursors */
1625         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1626         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1627         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1628         /* init appearance */
1629         dc.norm[ColBorder] = getcolor(normbordercolor);
1630         dc.norm[ColBG] = getcolor(normbgcolor);
1631         dc.norm[ColFG] = getcolor(normfgcolor);
1632         dc.sel[ColBorder] = getcolor(selbordercolor);
1633         dc.sel[ColBG] = getcolor(selbgcolor);
1634         dc.sel[ColFG] = getcolor(selfgcolor);
1635         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1636         dc.gc = XCreateGC(dpy, root, 0, NULL);
1637         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1638         if(!dc.font.set)
1639                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1640         /* init bars */
1641         updatebars();
1642         updatestatus();
1643         /* EWMH support per view */
1644         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1645                         PropModeReplace, (unsigned char *) netatom, NetLast);
1646         XDeleteProperty(dpy, root, netatom[NetClientList]);
1647         /* select for events */
1648         wa.cursor = cursor[CurNormal];
1649         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1650                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1651         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1652         XSelectInput(dpy, root, wa.event_mask);
1653         grabkeys();
1654 }
1655
1656 void
1657 showhide(Client *c) {
1658         if(!c)
1659                 return;
1660         if(ISVISIBLE(c)) { /* show clients top down */
1661                 XMoveWindow(dpy, c->win, c->x, c->y);
1662                 if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1663                         resize(c, c->x, c->y, c->w, c->h, False);
1664                 showhide(c->snext);
1665         }
1666         else { /* hide clients bottom up */
1667                 showhide(c->snext);
1668                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1669         }
1670 }
1671
1672 void
1673 sigchld(int unused) {
1674         if(signal(SIGCHLD, sigchld) == SIG_ERR)
1675                 die("Can't install SIGCHLD handler");
1676         while(0 < waitpid(-1, NULL, WNOHANG));
1677 }
1678
1679 void
1680 spawn(const Arg *arg) {
1681         if(fork() == 0) {
1682                 if(dpy)
1683                         close(ConnectionNumber(dpy));
1684                 setsid();
1685                 execvp(((char **)arg->v)[0], (char **)arg->v);
1686                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1687                 perror(" failed");
1688                 exit(EXIT_SUCCESS);
1689         }
1690 }
1691
1692 void
1693 tag(const Arg *arg) {
1694         if(selmon->sel && arg->ui & TAGMASK) {
1695                 selmon->sel->tags = arg->ui & TAGMASK;
1696                 focus(NULL);
1697                 arrange(selmon);
1698         }
1699 }
1700
1701 void
1702 tagmon(const Arg *arg) {
1703         if(!selmon->sel || !mons->next)
1704                 return;
1705         sendmon(selmon->sel, dirtomon(arg->i));
1706 }
1707
1708 int
1709 textnw(const char *text, unsigned int len) {
1710         XRectangle r;
1711
1712         if(dc.font.set) {
1713                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1714                 return r.width;
1715         }
1716         return XTextWidth(dc.font.xfont, text, len);
1717 }
1718
1719 void
1720 tile(Monitor *m) {
1721         unsigned int i, n, h, mw, my, ty;
1722         Client *c;
1723
1724         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1725         if(n == 0)
1726                 return;
1727
1728         if(n > m->nmaster)
1729                 mw = m->nmaster ? m->ww * m->mfact : 0;
1730         else
1731                 mw = m->ww;
1732         for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1733                 if(i < m->nmaster) {
1734                         h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1735                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1736                         my += HEIGHT(c);
1737                 }
1738                 else {
1739                         h = (m->wh - ty) / (n - i);
1740                         resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1741                         ty += HEIGHT(c);
1742                 }
1743 }
1744
1745 void
1746 togglebar(const Arg *arg) {
1747         selmon->showbar = !selmon->showbar;
1748         updatebarpos(selmon);
1749         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1750         arrange(selmon);
1751 }
1752
1753 void
1754 togglefloating(const Arg *arg) {
1755         if(!selmon->sel)
1756                 return;
1757         if(selmon->sel->isfullscreen) /* no support for fullscreen windows */
1758                 return;
1759         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1760         if(selmon->sel->isfloating)
1761                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1762                        selmon->sel->w, selmon->sel->h, False);
1763         arrange(selmon);
1764 }
1765
1766 void
1767 toggletag(const Arg *arg) {
1768         unsigned int newtags;
1769
1770         if(!selmon->sel)
1771                 return;
1772         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1773         if(newtags) {
1774                 selmon->sel->tags = newtags;
1775                 focus(NULL);
1776                 arrange(selmon);
1777         }
1778 }
1779
1780 void
1781 toggleview(const Arg *arg) {
1782         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1783
1784         if(newtagset) {
1785                 selmon->tagset[selmon->seltags] = newtagset;
1786                 focus(NULL);
1787                 arrange(selmon);
1788         }
1789 }
1790
1791 void
1792 unfocus(Client *c, Bool setfocus) {
1793         if(!c)
1794                 return;
1795         grabbuttons(c, False);
1796         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1797         if(setfocus) {
1798                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1799                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1800         }
1801 }
1802
1803 void
1804 unmanage(Client *c, Bool destroyed) {
1805         Monitor *m = c->mon;
1806         XWindowChanges wc;
1807
1808         /* The server grab construct avoids race conditions. */
1809         detach(c);
1810         detachstack(c);
1811         if(!destroyed) {
1812                 wc.border_width = c->oldbw;
1813                 XGrabServer(dpy);
1814                 XSetErrorHandler(xerrordummy);
1815                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1816                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1817                 setclientstate(c, WithdrawnState);
1818                 XSync(dpy, False);
1819                 XSetErrorHandler(xerror);
1820                 XUngrabServer(dpy);
1821         }
1822         free(c);
1823         focus(NULL);
1824         updateclientlist();
1825         arrange(m);
1826 }
1827
1828 void
1829 unmapnotify(XEvent *e) {
1830         Client *c;
1831         XUnmapEvent *ev = &e->xunmap;
1832
1833         if((c = wintoclient(ev->window))) {
1834                 if(ev->send_event)
1835                         setclientstate(c, WithdrawnState);
1836                 else
1837                         unmanage(c, False);
1838         }
1839 }
1840
1841 void
1842 updatebars(void) {
1843         Monitor *m;
1844         XSetWindowAttributes wa = {
1845                 .override_redirect = True,
1846                 .background_pixmap = ParentRelative,
1847                 .event_mask = ButtonPressMask|ExposureMask
1848         };
1849         for(m = mons; m; m = m->next) {
1850                 if (m->barwin)
1851                         continue;
1852                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1853                                           CopyFromParent, DefaultVisual(dpy, screen),
1854                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1855                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1856                 XMapRaised(dpy, m->barwin);
1857         }
1858 }
1859
1860 void
1861 updatebarpos(Monitor *m) {
1862         m->wy = m->my;
1863         m->wh = m->mh;
1864         if(m->showbar) {
1865                 m->wh -= bh;
1866                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1867                 m->wy = m->topbar ? m->wy + bh : m->wy;
1868         }
1869         else
1870                 m->by = -bh;
1871 }
1872
1873 void
1874 updateclientlist() {
1875         Client *c;
1876         Monitor *m;
1877
1878         XDeleteProperty(dpy, root, netatom[NetClientList]);
1879         for(m = mons; m; m = m->next)
1880                 for(c = m->clients; c; c = c->next)
1881                         XChangeProperty(dpy, root, netatom[NetClientList],
1882                                         XA_WINDOW, 32, PropModeAppend,
1883                                         (unsigned char *) &(c->win), 1);
1884 }
1885
1886 void
1887 updategeom(void) {
1888         /* Starting with dwm 6.1 this function uses a new (simpler) strategy:
1889          * whenever screen changes are reported, we destroy all monitors
1890          * and recreate all unique origin monitors and add all clients to
1891          * the first monitor, only. In several circumstances this may suck,
1892          * but dealing with all corner-cases sucks even more.*/
1893
1894 #ifdef XINERAMA
1895         if(XineramaIsActive(dpy)) {
1896                 int i, j, n;
1897                 Client *c;
1898                 Monitor *m, *oldmons = mons;
1899                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &n);
1900                 XineramaScreenInfo *unique = NULL;
1901
1902                 /* only consider unique geometries as separate screens */
1903                 if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * n)))
1904                         die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * n);
1905                 for(i = 0, j = 0; i < n; i++)
1906                         if(isuniquegeom(unique, j, &info[i]))
1907                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1908                 XFree(info);
1909                 /* create new monitor structure */
1910                 n = j;
1911                 mons = m = createmon(); /* new first monitor */
1912                 for(i = 1; i < n; i++) {
1913                         m->next = createmon();
1914                         m = m->next;
1915                 }
1916                 for(i = 0, m = mons; i < n && m; m = m->next, i++) {
1917                         m->num = i;
1918                         m->mx = m->wx = unique[i].x_org;
1919                         m->my = m->wy = unique[i].y_org;
1920                         m->mw = m->ww = unique[i].width;
1921                         m->mh = m->wh = unique[i].height;
1922                         updatebarpos(m);
1923                 }
1924                 free(unique);
1925                 /* re-attach old clients and cleanup old monitor structure */
1926                 while(oldmons) {
1927                         m = oldmons;
1928                         while(m->clients) {
1929                                 c = m->clients;
1930                                 m->clients = c->next;
1931                                 detachstack(c);
1932                                 c->mon = mons;
1933                                 attach(c);
1934                                 attachstack(c);
1935                         }
1936                         oldmons = m->next;
1937                         cleanupmon(m);
1938                 }
1939         }
1940         else
1941 #endif /* XINERAMA */
1942         /* default monitor setup */
1943         {
1944                 if(!mons) /* only true if !XINERAMA compile flag */
1945                         mons = createmon();
1946                 if(mons->mw != sw || mons->mh != sh) {
1947                         mons->mw = mons->ww = sw;
1948                         mons->mh = mons->wh = sh;
1949                         updatebarpos(mons);
1950                 }
1951         }
1952         selmon = mons;
1953         selmon = wintomon(root);
1954 }
1955
1956 void
1957 updatenumlockmask(void) {
1958         unsigned int i, j;
1959         XModifierKeymap *modmap;
1960
1961         numlockmask = 0;
1962         modmap = XGetModifierMapping(dpy);
1963         for(i = 0; i < 8; i++)
1964                 for(j = 0; j < modmap->max_keypermod; j++)
1965                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1966                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1967                                 numlockmask = (1 << i);
1968         XFreeModifiermap(modmap);
1969 }
1970
1971 void
1972 updatesizehints(Client *c) {
1973         long msize;
1974         XSizeHints size;
1975
1976         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1977                 /* size is uninitialized, ensure that size.flags aren't used */
1978                 size.flags = PSize;
1979         if(size.flags & PBaseSize) {
1980                 c->basew = size.base_width;
1981                 c->baseh = size.base_height;
1982         }
1983         else if(size.flags & PMinSize) {
1984                 c->basew = size.min_width;
1985                 c->baseh = size.min_height;
1986         }
1987         else
1988                 c->basew = c->baseh = 0;
1989         if(size.flags & PResizeInc) {
1990                 c->incw = size.width_inc;
1991                 c->inch = size.height_inc;
1992         }
1993         else
1994                 c->incw = c->inch = 0;
1995         if(size.flags & PMaxSize) {
1996                 c->maxw = size.max_width;
1997                 c->maxh = size.max_height;
1998         }
1999         else
2000                 c->maxw = c->maxh = 0;
2001         if(size.flags & PMinSize) {
2002                 c->minw = size.min_width;
2003                 c->minh = size.min_height;
2004         }
2005         else if(size.flags & PBaseSize) {
2006                 c->minw = size.base_width;
2007                 c->minh = size.base_height;
2008         }
2009         else
2010                 c->minw = c->minh = 0;
2011         if(size.flags & PAspect) {
2012                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2013                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2014         }
2015         else
2016                 c->maxa = c->mina = 0.0;
2017         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
2018                      && c->maxw == c->minw && c->maxh == c->minh);
2019 }
2020
2021 void
2022 updatetitle(Client *c) {
2023         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2024                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2025         if(c->name[0] == '\0') /* hack to mark broken clients */
2026                 strcpy(c->name, broken);
2027 }
2028
2029 void
2030 updatestatus(void) {
2031         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2032                 strcpy(stext, "dwm-"VERSION);
2033         drawbar(selmon);
2034 }
2035
2036 void
2037 updatewindowtype(Client *c) {
2038         Atom state = getatomprop(c, netatom[NetWMState]);
2039         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2040
2041         if(state == netatom[NetWMFullscreen])
2042                 setfullscreen(c, True);
2043         if(wtype == netatom[NetWMWindowTypeDialog])
2044                 c->isfloating = True;
2045 }
2046
2047 void
2048 updatewmhints(Client *c) {
2049         XWMHints *wmh;
2050
2051         if((wmh = XGetWMHints(dpy, c->win))) {
2052                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2053                         wmh->flags &= ~XUrgencyHint;
2054                         XSetWMHints(dpy, c->win, wmh);
2055                 }
2056                 else
2057                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2058                 if(wmh->flags & InputHint)
2059                         c->neverfocus = !wmh->input;
2060                 else
2061                         c->neverfocus = False;
2062                 XFree(wmh);
2063         }
2064 }
2065
2066 void
2067 view(const Arg *arg) {
2068         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2069                 return;
2070         selmon->seltags ^= 1; /* toggle sel tagset */
2071         if(arg->ui & TAGMASK)
2072                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2073         focus(NULL);
2074         arrange(selmon);
2075 }
2076
2077 Client *
2078 wintoclient(Window w) {
2079         Client *c;
2080         Monitor *m;
2081
2082         for(m = mons; m; m = m->next)
2083                 for(c = m->clients; c; c = c->next)
2084                         if(c->win == w)
2085                                 return c;
2086         return NULL;
2087 }
2088
2089 Monitor *
2090 wintomon(Window w) {
2091         int x, y;
2092         Client *c;
2093         Monitor *m;
2094
2095         if(w == root && getrootptr(&x, &y))
2096                 return recttomon(x, y, 1, 1);
2097         for(m = mons; m; m = m->next)
2098                 if(w == m->barwin)
2099                         return m;
2100         if((c = wintoclient(w)))
2101                 return c->mon;
2102         return selmon;
2103 }
2104
2105 /* There's no way to check accesses to destroyed windows, thus those cases are
2106  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2107  * default error handler, which may call exit.  */
2108 int
2109 xerror(Display *dpy, XErrorEvent *ee) {
2110         if(ee->error_code == BadWindow
2111         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2112         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2113         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2114         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2115         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2116         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2117         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2118         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2119                 return 0;
2120         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2121                         ee->request_code, ee->error_code);
2122         return xerrorxlib(dpy, ee); /* may call exit */
2123 }
2124
2125 int
2126 xerrordummy(Display *dpy, XErrorEvent *ee) {
2127         return 0;
2128 }
2129
2130 /* Startup Error handler to check if another window manager
2131  * is already running. */
2132 int
2133 xerrorstart(Display *dpy, XErrorEvent *ee) {
2134         die("dwm: another window manager is already running\n");
2135         return -1;
2136 }
2137
2138 void
2139 zoom(const Arg *arg) {
2140         Client *c = selmon->sel;
2141
2142         if(!selmon->lt[selmon->sellt]->arrange
2143         || (selmon->sel && selmon->sel->isfloating))
2144                 return;
2145         if(c == nexttiled(selmon->clients))
2146                 if(!c || !(c = nexttiled(c->next)))
2147                         return;
2148         pop(c);
2149 }
2150
2151 int
2152 main(int argc, char *argv[]) {
2153         if(argc == 2 && !strcmp("-v", argv[1]))
2154                 die("dwm-"VERSION", © 2006-2012 dwm engineers, see LICENSE for details\n");
2155         else if(argc != 1)
2156                 die("usage: dwm [-v]\n");
2157         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2158                 fputs("warning: no locale support\n", stderr);
2159         if(!(dpy = XOpenDisplay(NULL)))
2160                 die("dwm: cannot open display\n");
2161         checkotherwm();
2162         setup();
2163         scan();
2164         run();
2165         cleanup();
2166         XCloseDisplay(dpy);
2167         return EXIT_SUCCESS;
2168 }