main.c

   1 /* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
   2  * See LICENSE file for license details.
   3  */
   4
   5 #include "dwm.h"
   6 #include <errno.h>
   7 #include <locale.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12 #include <sys/select.h>
  13 #include <X11/cursorfont.h>
  14 #include <X11/keysym.h>
  15 #include <X11/Xatom.h>
  16 #include <X11/Xproto.h>
  17
  18 /* extern */
  19
  20 char stext[256];
  21 int bh, bmw, screen, sx, sy, sw, sh, wax, way, waw, wah;
  22 unsigned int ntags, numlockmask;
  23 Atom wmatom[WMLast], netatom[NetLast];
  24 Bool running = True;
  25 Bool *seltag;
  26 Bool selscreen = True;
  27 Client *clients = NULL;
  28 Client *sel = NULL;
  29 Client *stack = NULL;
  30 Cursor cursor[CurLast];
  31 Display *dpy;
  32 DC dc = {0};
  33 Window root, barwin;
  34
  35 /* static */
  36
  37 static int (*xerrorxlib)(Display *, XErrorEvent *);
  38 static Bool otherwm, readin;
  39
  40 static void
  41 cleanup(void) {
  42         close(STDIN_FILENO);
  43         while(stack) {
  44                 if(stack->isbanned)
  45                         XMoveWindow(dpy, stack->win, stack->x, stack->y);
  46                 unmanage(stack);
  47         }
  48         if(dc.font.set)
  49                 XFreeFontSet(dpy, dc.font.set);
  50         else
  51                 XFreeFont(dpy, dc.font.xfont);
  52         XUngrabKey(dpy, AnyKey, AnyModifier, root);
  53         XFreePixmap(dpy, dc.drawable);
  54         XFreeGC(dpy, dc.gc);
  55         XDestroyWindow(dpy, barwin);
  56         XFreeCursor(dpy, cursor[CurNormal]);
  57         XFreeCursor(dpy, cursor[CurResize]);
  58         XFreeCursor(dpy, cursor[CurMove]);
  59         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
  60         XSync(dpy, False);
  61         free(seltag);
  62 }
  63
  64 static unsigned int
  65 textnw(const char *text, unsigned int len) {
  66         XRectangle r;
  67
  68         if(dc.font.set) {
  69                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
  70                 return r.width;
  71         }
  72         return XTextWidth(dc.font.xfont, text, len);
  73 }
  74
  75 static void
  76 drawtext(const char *text, unsigned long col[ColLast], Bool filledsquare, Bool emptysquare) {
  77         int x, y, w, h;
  78         static char buf[256];
  79         unsigned int len, olen;
  80         XGCValues gcv;
  81         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
  82
  83         XSetForeground(dpy, dc.gc, col[ColBG]);
  84         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
  85         if(!text)
  86                 return;
  87         w = 0;
  88         olen = len = strlen(text);
  89         if(len >= sizeof buf)
  90                 len = sizeof buf - 1;
  91         memcpy(buf, text, len);
  92         buf[len] = 0;
  93         h = dc.font.ascent + dc.font.descent;
  94         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
  95         x = dc.x + (h / 2);
  96         /* shorten text if necessary */
  97         while(len && (w = textnw(buf, len)) > dc.w - h)
  98                 buf[--len] = 0;
  99         if(len < olen) {
 100                 if(len > 1)
 101                         buf[len - 1] = '.';
 102                 if(len > 2)
 103                         buf[len - 2] = '.';
 104                 if(len > 3)
 105                         buf[len - 3] = '.';
 106         }
 107         if(w > dc.w)
 108                 return; /* too long */
 109         gcv.foreground = col[ColFG];
 110         if(dc.font.set) {
 111                 XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 112                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 113         }
 114         else {
 115                 gcv.font = dc.font.xfont->fid;
 116                 XChangeGC(dpy, dc.gc, GCForeground | GCFont, &gcv);
 117                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 118         }
 119         x = (h + 2) / 4;
 120         r.x = dc.x + 1;
 121         r.y = dc.y + 1;
 122         if(filledsquare) {
 123                 r.width = r.height = x + 1;
 124                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 125         }
 126         else if(emptysquare) {
 127                 r.width = r.height = x;
 128                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 129         }
 130 }
 131
 132 static unsigned long
 133 getcolor(const char *colstr) {
 134         Colormap cmap = DefaultColormap(dpy, screen);
 135         XColor color;
 136
 137         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 138                 eprint("error, cannot allocate color '%s'\n", colstr);
 139         return color.pixel;
 140 }
 141
 142 static Bool
 143 isoccupied(unsigned int t) {
 144         Client *c;
 145
 146         for(c = clients; c; c = c->next)
 147                 if(c->tags[t])
 148                         return True;
 149         return False;
 150 }
 151
 152 static void
 153 scan(void) {
 154         unsigned int i, num;
 155         Window *wins, d1, d2;
 156         XWindowAttributes wa;
 157
 158         wins = NULL;
 159         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 160                 for(i = 0; i < num; i++) {
 161                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
 162                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 163                                 continue;
 164                         if(wa.map_state == IsViewable)
 165                                 manage(wins[i], &wa);
 166                 }
 167         }
 168         if(wins)
 169                 XFree(wins);
 170 }
 171
 172 static void
 173 setfont(const char *fontstr) {
 174         char *def, **missing;
 175         int i, n;
 176
 177         missing = NULL;
 178         if(dc.font.set)
 179                 XFreeFontSet(dpy, dc.font.set);
 180         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 181         if(missing) {
 182                 while(n--)
 183                         fprintf(stderr, "missing fontset: %s\n", missing[n]);
 184                 XFreeStringList(missing);
 185         }
 186         if(dc.font.set) {
 187                 XFontSetExtents *font_extents;
 188                 XFontStruct **xfonts;
 189                 char **font_names;
 190                 dc.font.ascent = dc.font.descent = 0;
 191                 font_extents = XExtentsOfFontSet(dc.font.set);
 192                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 193                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 194                         if(dc.font.ascent < (*xfonts)->ascent)
 195                                 dc.font.ascent = (*xfonts)->ascent;
 196                         if(dc.font.descent < (*xfonts)->descent)
 197                                 dc.font.descent = (*xfonts)->descent;
 198                         xfonts++;
 199                 }
 200         }
 201         else {
 202                 if(dc.font.xfont)
 203                         XFreeFont(dpy, dc.font.xfont);
 204                 dc.font.xfont = NULL;
 205                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
 206                         eprint("error, cannot load font: '%s'\n", fontstr);
 207                 dc.font.ascent = dc.font.xfont->ascent;
 208                 dc.font.descent = dc.font.xfont->descent;
 209         }
 210         dc.font.height = dc.font.ascent + dc.font.descent;
 211 }
 212
 213 static void
 214 setup(void) {
 215         int i, j;
 216         unsigned int mask;
 217         Window w;
 218         XModifierKeymap *modmap;
 219         XSetWindowAttributes wa;
 220
 221         /* init atoms */
 222         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 223         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 224         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
 225         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 226         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 227         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
 228                         PropModeReplace, (unsigned char *) netatom, NetLast);
 229         /* init cursors */
 230         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 231         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 232         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 233         /* init modifier map */
 234         numlockmask = 0;
 235         modmap = XGetModifierMapping(dpy);
 236         for (i = 0; i < 8; i++)
 237                 for (j = 0; j < modmap->max_keypermod; j++) {
 238                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 239                                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 240                                 numlockmask = (1 << i);
 241                 }
 242         XFreeModifiermap(modmap);
 243         /* select for events */
 244         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 245                 | EnterWindowMask | LeaveWindowMask;
 246         wa.cursor = cursor[CurNormal];
 247         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 248         grabkeys();
 249         compileregexps();
 250         for(ntags = 0; tags[ntags]; ntags++);
 251         seltag = emallocz(sizeof(Bool) * ntags);
 252         seltag[0] = True;
 253         /* style */
 254         dc.norm[ColBorder] = getcolor(NORMBORDERCOLOR);
 255         dc.norm[ColBG] = getcolor(NORMBGCOLOR);
 256         dc.norm[ColFG] = getcolor(NORMFGCOLOR);
 257         dc.sel[ColBorder] = getcolor(SELBORDERCOLOR);
 258         dc.sel[ColBG] = getcolor(SELBGCOLOR);
 259         dc.sel[ColFG] = getcolor(SELFGCOLOR);
 260         setfont(FONT);
 261         /* geometry */
 262         sx = sy = 0;
 263         sw = DisplayWidth(dpy, screen);
 264         sh = DisplayHeight(dpy, screen);
 265         bmw = textw(TILESYMBOL) > textw(FLOATSYMBOL) ? textw(TILESYMBOL) : textw(FLOATSYMBOL);
 266         /* bar */
 267         dc.h = bh = dc.font.height + 2;
 268         wa.override_redirect = 1;
 269         wa.background_pixmap = ParentRelative;
 270         wa.event_mask = ButtonPressMask | ExposureMask;
 271         barwin = XCreateWindow(dpy, root, sx, sy + (TOPBAR ? 0 : sh - bh), sw, bh, 0,
 272                         DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
 273                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 274         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 275         XMapRaised(dpy, barwin);
 276         strcpy(stext, "dwm-"VERSION);
 277         /* windowarea */
 278         wax = sx;
 279         way = sy + (TOPBAR ? bh : 0);
 280         wah = sh - bh;
 281         waw = sw;
 282         /* pixmap for everything */
 283         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 284         dc.gc = XCreateGC(dpy, root, 0, 0);
 285         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 286         /* multihead support */
 287         selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 288 }
 289
 290 /*
 291  * Startup Error handler to check if another window manager
 292  * is already running.
 293  */
 294 static int
 295 xerrorstart(Display *dsply, XErrorEvent *ee) {
 296         otherwm = True;
 297         return -1;
 298 }
 299
 300 /* extern */
 301
 302 void
 303 drawstatus(void) {
 304         int i, x;
 305
 306         dc.x = dc.y = 0;
 307         for(i = 0; i < ntags; i++) {
 308                 dc.w = textw(tags[i]);
 309                 if(seltag[i])
 310                         drawtext(tags[i], dc.sel, sel && sel->tags[i], isoccupied(i));
 311                 else
 312                         drawtext(tags[i], dc.norm, sel && sel->tags[i], isoccupied(i));
 313                 dc.x += dc.w;
 314         }
 315         dc.w = bmw;
 316         drawtext(arrange == dofloat ? FLOATSYMBOL : TILESYMBOL, dc.norm, False, False);
 317         x = dc.x + dc.w;
 318         dc.w = textw(stext);
 319         dc.x = sw - dc.w;
 320         if(dc.x < x) {
 321                 dc.x = x;
 322                 dc.w = sw - x;
 323         }
 324         drawtext(stext, dc.norm, False, False);
 325         if((dc.w = dc.x - x) > bh) {
 326                 dc.x = x;
 327                 drawtext(sel ? sel->name : NULL, sel ? dc.sel : dc.norm, False, False);
 328         }
 329         XCopyArea(dpy, dc.drawable, barwin, dc.gc, 0, 0, sw, bh, 0, 0);
 330         XSync(dpy, False);
 331 }
 332
 333 void
 334 sendevent(Window w, Atom a, long value) {
 335         XEvent e;
 336
 337         e.type = ClientMessage;
 338         e.xclient.window = w;
 339         e.xclient.message_type = a;
 340         e.xclient.format = 32;
 341         e.xclient.data.l[0] = value;
 342         e.xclient.data.l[1] = CurrentTime;
 343         XSendEvent(dpy, w, False, NoEventMask, &e);
 344         XSync(dpy, False);
 345 }
 346
 347 unsigned int
 348 textw(const char *text) {
 349         return textnw(text, strlen(text)) + dc.font.height;
 350 }
 351
 352 void
 353 quit(Arg *arg) {
 354         readin = running = False;
 355 }
 356
 357 /* There's no way to check accesses to destroyed windows, thus those cases are
 358  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 359  * default error handler, which may call exit.
 360  */
 361 int
 362 xerror(Display *dpy, XErrorEvent *ee) {
 363         if(ee->error_code == BadWindow
 364         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 365         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 366         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
 367         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 368         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
 369         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
 370         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
 371                 return 0;
 372         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 373                 ee->request_code, ee->error_code);
 374         return xerrorxlib(dpy, ee); /* may call exit */
 375 }
 376
 377 int
 378 main(int argc, char *argv[]) {
 379         char *p;
 380         int r, xfd;
 381         fd_set rd;
 382
 383         if(argc == 2 && !strncmp("-v", argv[1], 3)) {
 384                 fputs("dwm-"VERSION", (C)opyright MMVI-MMVII Anselm R. Garbe\n", stdout);
 385                 exit(EXIT_SUCCESS);
 386         }
 387         else if(argc != 1)
 388                 eprint("usage: dwm [-v]\n");
 389         setlocale(LC_CTYPE, "");
 390         dpy = XOpenDisplay(0);
 391         if(!dpy)
 392                 eprint("dwm: cannot open display\n");
 393         xfd = ConnectionNumber(dpy);
 394         screen = DefaultScreen(dpy);
 395         root = RootWindow(dpy, screen);
 396         otherwm = False;
 397         XSetErrorHandler(xerrorstart);
 398         /* this causes an error if some other window manager is running */
 399         XSelectInput(dpy, root, SubstructureRedirectMask);
 400         XSync(dpy, False);
 401         if(otherwm)
 402                 eprint("dwm: another window manager is already running\n");
 403
 404         XSync(dpy, False);
 405         XSetErrorHandler(NULL);
 406         xerrorxlib = XSetErrorHandler(xerror);
 407         XSync(dpy, False);
 408         setup();
 409         drawstatus();
 410         scan();
 411
 412         /* main event loop, also reads status text from stdin */
 413         XSync(dpy, False);
 414         procevent();
 415         readin = True;
 416         while(running) {
 417                 FD_ZERO(&rd);
 418                 if(readin)
 419                         FD_SET(STDIN_FILENO, &rd);
 420                 FD_SET(xfd, &rd);
 421                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
 422                         if(errno == EINTR)
 423                                 continue;
 424                         eprint("select failed\n");
 425                 }
 426                 if(FD_ISSET(STDIN_FILENO, &rd)) {
 427                         switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
 428                         case -1:
 429                                 strncpy(stext, strerror(errno), sizeof stext - 1);
 430                                 stext[sizeof stext - 1] = '\0';
 431                                 readin = False;
 432                                 break;
 433                         case 0:
 434                                 strncpy(stext, "EOF", 4);
 435                                 readin = False;
 436                                 break;
 437                         default:
 438                                 for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
 439                                 for(; p >= stext && *p != '\n'; --p);
 440                                 if(p > stext)
 441                                         strncpy(stext, p + 1, sizeof stext);
 442                         }
 443                         drawstatus();
 444                 }
 445                 if(FD_ISSET(xfd, &rd))
 446                         procevent();
 447         }
 448         cleanup();
 449         XCloseDisplay(dpy);
 450         return 0;
 451 }