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 screen, sx, sy, sw, sh, wax, way, waw, wah;
  22 unsigned int bh, 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 drawsquare(Bool filled, Bool empty, unsigned long col[ColLast]) {
  77         int x;
  78         XGCValues gcv;
  79         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
  80
  81         gcv.foreground = col[ColFG];
  82         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
  83         x = (dc.font.ascent + dc.font.descent + 2) / 4;
  84         r.x = dc.x + 1;
  85         r.y = dc.y + 1;
  86         if(filled) {
  87                 r.width = r.height = x + 1;
  88                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
  89         }
  90         else if(empty) {
  91                 r.width = r.height = x;
  92                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
  93         }
  94 }
  95
  96 static unsigned long
  97 getcolor(const char *colstr) {
  98         Colormap cmap = DefaultColormap(dpy, screen);
  99         XColor color;
 100
 101         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 102                 eprint("error, cannot allocate color '%s'\n", colstr);
 103         return color.pixel;
 104 }
 105
 106 static Bool
 107 isoccupied(unsigned int t) {
 108         Client *c;
 109
 110         for(c = clients; c; c = c->next)
 111                 if(c->tags[t])
 112                         return True;
 113         return False;
 114 }
 115
 116 static void
 117 scan(void) {
 118         unsigned int i, num;
 119         Window *wins, d1, d2;
 120         XWindowAttributes wa;
 121
 122         wins = NULL;
 123         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 124                 for(i = 0; i < num; i++) {
 125                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
 126                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 127                                 continue;
 128                         if(wa.map_state == IsViewable)
 129                                 manage(wins[i], &wa);
 130                 }
 131         }
 132         if(wins)
 133                 XFree(wins);
 134 }
 135
 136 static void
 137 setfont(const char *fontstr) {
 138         char *def, **missing;
 139         int i, n;
 140
 141         missing = NULL;
 142         if(dc.font.set)
 143                 XFreeFontSet(dpy, dc.font.set);
 144         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 145         if(missing) {
 146                 while(n--)
 147                         fprintf(stderr, "missing fontset: %s\n", missing[n]);
 148                 XFreeStringList(missing);
 149         }
 150         if(dc.font.set) {
 151                 XFontSetExtents *font_extents;
 152                 XFontStruct **xfonts;
 153                 char **font_names;
 154                 dc.font.ascent = dc.font.descent = 0;
 155                 font_extents = XExtentsOfFontSet(dc.font.set);
 156                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 157                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 158                         if(dc.font.ascent < (*xfonts)->ascent)
 159                                 dc.font.ascent = (*xfonts)->ascent;
 160                         if(dc.font.descent < (*xfonts)->descent)
 161                                 dc.font.descent = (*xfonts)->descent;
 162                         xfonts++;
 163                 }
 164         }
 165         else {
 166                 if(dc.font.xfont)
 167                         XFreeFont(dpy, dc.font.xfont);
 168                 dc.font.xfont = NULL;
 169                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
 170                         eprint("error, cannot load font: '%s'\n", fontstr);
 171                 dc.font.ascent = dc.font.xfont->ascent;
 172                 dc.font.descent = dc.font.xfont->descent;
 173         }
 174         dc.font.height = dc.font.ascent + dc.font.descent;
 175 }
 176
 177 static void
 178 setup(void) {
 179         int i, j;
 180         unsigned int mask;
 181         Window w;
 182         XModifierKeymap *modmap;
 183         XSetWindowAttributes wa;
 184
 185         /* init atoms */
 186         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 187         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 188         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
 189         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 190         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 191         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
 192                         PropModeReplace, (unsigned char *) netatom, NetLast);
 193         /* init cursors */
 194         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 195         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 196         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 197         /* init modifier map */
 198         numlockmask = 0;
 199         modmap = XGetModifierMapping(dpy);
 200         for (i = 0; i < 8; i++)
 201                 for (j = 0; j < modmap->max_keypermod; j++) {
 202                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
 203                                         == XKeysymToKeycode(dpy, XK_Num_Lock))
 204                                 numlockmask = (1 << i);
 205                 }
 206         XFreeModifiermap(modmap);
 207         /* select for events */
 208         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 209                 | EnterWindowMask | LeaveWindowMask;
 210         wa.cursor = cursor[CurNormal];
 211         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 212         grabkeys();
 213         compileregs();
 214         for(ntags = 0; tags[ntags]; ntags++);
 215         seltag = emallocz(sizeof(Bool) * ntags);
 216         seltag[0] = True;
 217         /* style */
 218         dc.norm[ColBorder] = getcolor(NORMBORDERCOLOR);
 219         dc.norm[ColBG] = getcolor(NORMBGCOLOR);
 220         dc.norm[ColFG] = getcolor(NORMFGCOLOR);
 221         dc.sel[ColBorder] = getcolor(SELBORDERCOLOR);
 222         dc.sel[ColBG] = getcolor(SELBGCOLOR);
 223         dc.sel[ColFG] = getcolor(SELFGCOLOR);
 224         setfont(FONT);
 225         /* geometry */
 226         sx = sy = 0;
 227         sw = DisplayWidth(dpy, screen);
 228         sh = DisplayHeight(dpy, screen);
 229         initlayouts();
 230         /* bar */
 231         dc.h = bh = dc.font.height + 2;
 232         wa.override_redirect = 1;
 233         wa.background_pixmap = ParentRelative;
 234         wa.event_mask = ButtonPressMask | ExposureMask;
 235         barwin = XCreateWindow(dpy, root, sx, sy + (TOPBAR ? 0 : sh - bh), sw, bh, 0,
 236                         DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
 237                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 238         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 239         XMapRaised(dpy, barwin);
 240         strcpy(stext, "dwm-"VERSION);
 241         /* windowarea */
 242         wax = sx;
 243         way = sy + (TOPBAR ? bh : 0);
 244         wah = sh - bh;
 245         waw = sw;
 246         /* pixmap for everything */
 247         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 248         dc.gc = XCreateGC(dpy, root, 0, 0);
 249         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 250         /* multihead support */
 251         selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 252 }
 253
 254 /*
 255  * Startup Error handler to check if another window manager
 256  * is already running.
 257  */
 258 static int
 259 xerrorstart(Display *dsply, XErrorEvent *ee) {
 260         otherwm = True;
 261         return -1;
 262 }
 263
 264 /* extern */
 265
 266 void
 267 drawstatus(void) {
 268         int i, x;
 269
 270         dc.x = dc.y = 0;
 271         for(i = 0; i < ntags; i++) {
 272                 dc.w = textw(tags[i]);
 273                 if(seltag[i]) {
 274                         drawtext(tags[i], dc.sel);
 275                         drawsquare(sel && sel->tags[i], isoccupied(i), dc.sel);
 276                 }
 277                 else {
 278                         drawtext(tags[i], dc.norm);
 279                         drawsquare(sel && sel->tags[i], isoccupied(i), dc.norm);
 280                 }
 281                 dc.x += dc.w;
 282         }
 283         dc.w = blw;
 284         drawtext(lt->symbol, dc.norm);
 285         x = dc.x + dc.w;
 286         dc.w = textw(stext);
 287         dc.x = sw - dc.w;
 288         if(dc.x < x) {
 289                 dc.x = x;
 290                 dc.w = sw - x;
 291         }
 292         drawtext(stext, dc.norm);
 293         if((dc.w = dc.x - x) > bh) {
 294                 dc.x = x;
 295                 drawtext(sel ? sel->name : NULL, sel ? dc.sel : dc.norm);
 296         }
 297         XCopyArea(dpy, dc.drawable, barwin, dc.gc, 0, 0, sw, bh, 0, 0);
 298         XSync(dpy, False);
 299 }
 300
 301 void
 302 drawtext(const char *text, unsigned long col[ColLast]) {
 303         int x, y, w, h;
 304         static char buf[256];
 305         unsigned int len, olen;
 306         XGCValues gcv;
 307         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 308
 309         XSetForeground(dpy, dc.gc, col[ColBG]);
 310         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 311         if(!text)
 312                 return;
 313         w = 0;
 314         olen = len = strlen(text);
 315         if(len >= sizeof buf)
 316                 len = sizeof buf - 1;
 317         memcpy(buf, text, len);
 318         buf[len] = 0;
 319         h = dc.font.ascent + dc.font.descent;
 320         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 321         x = dc.x + (h / 2);
 322         /* shorten text if necessary */
 323         while(len && (w = textnw(buf, len)) > dc.w - h)
 324                 buf[--len] = 0;
 325         if(len < olen) {
 326                 if(len > 1)
 327                         buf[len - 1] = '.';
 328                 if(len > 2)
 329                         buf[len - 2] = '.';
 330                 if(len > 3)
 331                         buf[len - 3] = '.';
 332         }
 333         if(w > dc.w)
 334                 return; /* too long */
 335         gcv.foreground = col[ColFG];
 336         if(dc.font.set) {
 337                 XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 338                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 339         }
 340         else {
 341                 gcv.font = dc.font.xfont->fid;
 342                 XChangeGC(dpy, dc.gc, GCForeground | GCFont, &gcv);
 343                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 344         }
 345 }
 346
 347 void
 348 sendevent(Window w, Atom a, long value) {
 349         XEvent e;
 350
 351         e.type = ClientMessage;
 352         e.xclient.window = w;
 353         e.xclient.message_type = a;
 354         e.xclient.format = 32;
 355         e.xclient.data.l[0] = value;
 356         e.xclient.data.l[1] = CurrentTime;
 357         XSendEvent(dpy, w, False, NoEventMask, &e);
 358         XSync(dpy, False);
 359 }
 360
 361 unsigned int
 362 textw(const char *text) {
 363         return textnw(text, strlen(text)) + dc.font.height;
 364 }
 365
 366 void
 367 quit(Arg *arg) {
 368         readin = running = False;
 369 }
 370
 371 /* There's no way to check accesses to destroyed windows, thus those cases are
 372  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 373  * default error handler, which may call exit.
 374  */
 375 int
 376 xerror(Display *dpy, XErrorEvent *ee) {
 377         if(ee->error_code == BadWindow
 378         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 379         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 380         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
 381         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 382         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
 383         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
 384         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
 385                 return 0;
 386         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
 387                 ee->request_code, ee->error_code);
 388         return xerrorxlib(dpy, ee); /* may call exit */
 389 }
 390
 391 int
 392 main(int argc, char *argv[]) {
 393         char *p;
 394         int r, xfd;
 395         fd_set rd;
 396         XEvent ev;
 397
 398         if(argc == 2 && !strncmp("-v", argv[1], 3))
 399                 eprint("dwm-"VERSION", (C)opyright MMVI-MMVII Anselm R. Garbe\n");
 400         else if(argc != 1)
 401                 eprint("usage: dwm [-v]\n");
 402         setlocale(LC_CTYPE, "");
 403         if(!(dpy = XOpenDisplay(0)))
 404                 eprint("dwm: cannot open display\n");
 405         xfd = ConnectionNumber(dpy);
 406         screen = DefaultScreen(dpy);
 407         root = RootWindow(dpy, screen);
 408         otherwm = False;
 409         XSetErrorHandler(xerrorstart);
 410         /* this causes an error if some other window manager is running */
 411         XSelectInput(dpy, root, SubstructureRedirectMask);
 412         XSync(dpy, False);
 413         if(otherwm)
 414                 eprint("dwm: another window manager is already running\n");
 415
 416         XSync(dpy, False);
 417         XSetErrorHandler(NULL);
 418         xerrorxlib = XSetErrorHandler(xerror);
 419         XSync(dpy, False);
 420         setup();
 421         drawstatus();
 422         scan();
 423
 424         /* main event loop, also reads status text from stdin */
 425         XSync(dpy, False);
 426         readin = True;
 427         while(running) {
 428                 FD_ZERO(&rd);
 429                 if(readin)
 430                         FD_SET(STDIN_FILENO, &rd);
 431                 FD_SET(xfd, &rd);
 432                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
 433                         if(errno == EINTR)
 434                                 continue;
 435                         eprint("select failed\n");
 436                 }
 437                 if(FD_ISSET(STDIN_FILENO, &rd)) {
 438                         switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
 439                         case -1:
 440                                 strncpy(stext, strerror(errno), sizeof stext - 1);
 441                                 stext[sizeof stext - 1] = '\0';
 442                                 readin = False;
 443                                 break;
 444                         case 0:
 445                                 strncpy(stext, "EOF", 4);
 446                                 readin = False;
 447                                 break;
 448                         default:
 449                                 for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
 450                                 for(; p >= stext && *p != '\n'; --p);
 451                                 if(p > stext)
 452                                         strncpy(stext, p + 1, sizeof stext);
 453                         }
 454                         drawstatus();
 455                 }
 456                 if(FD_ISSET(xfd, &rd))
 457                         while(XPending(dpy)) {
 458                                 XNextEvent(dpy, &ev);
 459                                 if(handler[ev.type])
 460                                         (handler[ev.type])(&ev); /* call handler */
 461                         }
 462         }
 463         cleanup();
 464         XCloseDisplay(dpy);
 465         return 0;
 466 }