awesome.c

   1 /*
   2  * awesome.c - awesome main functions
   3  *
   4  * Copyright © 2007 Julien Danjou <julien@danjou.info>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  */
  21
  22 #include <errno.h>
  23 #include <locale.h>
  24 #include <stdio.h>
  25 #include <unistd.h>
  26 #include <sys/select.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xatom.h>
  30 #include <X11/Xproto.h>
  31 #include <X11/Xutil.h>
  32 #include <X11/extensions/shape.h>
  33 #include <X11/extensions/Xrandr.h>
  34
  35 #include "awesome.h"
  36 #include "event.h"
  37 #include "layout.h"
  38 #include "tag.h"
  39 #include "screen.h"
  40 #include "util.h"
  41 #include "statusbar.h"
  42
  43 Client *clients = NULL;
  44 Client *sel = NULL;
  45 Client *stack = NULL;
  46 DC *dc;
  47
  48 static int (*xerrorxlib) (Display *, XErrorEvent *);
  49 static Bool readin = True, running = True;
  50
  51 /** Cleanup everything on quit
  52  * \param disp Display ref
  53  * \param drawcontext Drawcontext ref
  54  * \param awesomeconf awesome config
  55  */
  56 static void
  57 cleanup(Display *disp, DC *drawcontext, awesome_config *awesomeconf)
  58 {
  59     int screen, i;
  60
  61     close(STDIN_FILENO);
  62
  63     while(stack)
  64     {
  65         unban(stack);
  66         unmanage(stack, drawcontext, NormalState, awesomeconf);
  67     }
  68
  69     for(screen = 0; screen < ScreenCount(disp); screen++)
  70     {
  71         if(drawcontext[screen].font.set)
  72             XFreeFontSet(disp, drawcontext[screen].font.set);
  73         else
  74             XFreeFont(disp, drawcontext[screen].font.xfont);
  75
  76             XUngrabKey(disp, AnyKey, AnyModifier, RootWindow(disp, screen));
  77
  78         XFreePixmap(disp, awesomeconf[screen].statusbar.drawable);
  79         XFreeGC(disp, drawcontext[screen].gc);
  80         XDestroyWindow(disp, awesomeconf[screen].statusbar.window);
  81         XFreeCursor(disp, drawcontext[screen].cursor[CurNormal]);
  82         XFreeCursor(disp, drawcontext[screen].cursor[CurResize]);
  83         XFreeCursor(disp, drawcontext[screen].cursor[CurMove]);
  84
  85         for(i = 0; i < awesomeconf[screen].ntags; i++)
  86             p_delete(&awesomeconf[screen].tags[i].name);
  87         for(i = 0; i < awesomeconf[screen].nkeys; i++)
  88             p_delete(&awesomeconf[screen].keys[i].arg);
  89         for(i = 0; i < awesomeconf[screen].nlayouts; i++)
  90             p_delete(&awesomeconf[screen].layouts[i].symbol);
  91         for(i = 0; i < awesomeconf[screen].nrules; i++)
  92         {
  93             p_delete(&awesomeconf[screen].rules[i].prop);
  94             p_delete(&awesomeconf[screen].rules[i].tags);
  95         }
  96         p_delete(&awesomeconf[screen].tags);
  97         p_delete(&awesomeconf[screen].layouts);
  98         p_delete(&awesomeconf[screen].rules);
  99         p_delete(&awesomeconf[screen].keys);
 100     }
 101     XSetInputFocus(disp, PointerRoot, RevertToPointerRoot, CurrentTime);
 102     XSync(disp, False);
 103     p_delete(&awesomeconf);
 104     p_delete(&dc);
 105 }
 106
 107 /** Get a window state (WM_STATE)
 108  * \param disp Display ref
 109  * \param w Client window
 110  * \return state
 111  */
 112 static long
 113 getstate(Display *disp, Window w)
 114 {
 115     int format, status;
 116     long result = -1;
 117     unsigned char *p = NULL;
 118     unsigned long n, extra;
 119     Atom real;
 120     status = XGetWindowProperty(disp, w, XInternAtom(disp, "WM_STATE", False),
 121                                 0L, 2L, False, XInternAtom(disp, "WM_STATE", False),
 122                                 &real, &format, &n, &extra, (unsigned char **) &p);
 123     if(status != Success)
 124         return -1;
 125     if(n != 0)
 126         result = *p;
 127     XFree(p);
 128     return result;
 129 }
 130
 131 /** Scan X to find windows to manage
 132  * \param disp Display ref
 133  * \param screen Screen number
 134  * \param drawcontext Drawcontext ref
 135  * \param awesomeconf awesome config
 136  */
 137 static void
 138 scan(Display *disp, int screen, DC *drawcontext, awesome_config *awesomeconf)
 139 {
 140     unsigned int i, num;
 141     Window *wins, d1, d2;
 142     XWindowAttributes wa;
 143
 144     wins = NULL;
 145     if(XQueryTree(disp, RootWindow(disp, screen), &d1, &d2, &wins, &num))
 146     {
 147         for(i = 0; i < num; i++)
 148         {
 149             if(!XGetWindowAttributes(disp, wins[i], &wa)
 150                || wa.override_redirect
 151                || XGetTransientForHint(disp, wins[i], &d1))
 152                 continue;
 153                 if(wa.map_state == IsViewable || getstate(disp, wins[i]) == IconicState)
 154                     manage(disp, drawcontext, wins[i], &wa, awesomeconf);
 155         }
 156         /* now the transients */
 157         for(i = 0; i < num; i++)
 158         {
 159             if(!XGetWindowAttributes(disp, wins[i], &wa))
 160                 continue;
 161             if(XGetTransientForHint(disp, wins[i], &d1)
 162                && (wa.map_state == IsViewable || getstate(disp, wins[i]) == IconicState))
 163                 manage(disp, drawcontext, wins[i], &wa, awesomeconf);
 164         }
 165     }
 166     if(wins)
 167         XFree(wins);
 168 }
 169
 170 /** Setup everything before running
 171  * \param disp Display ref
 172  * \param screen Screen number
 173  * \param awesomeconf awesome config ref
 174  * \todo clean things...
 175  */
 176 static void
 177 setup(Display *disp, int screen, DC *drawcontext, awesome_config *awesomeconf)
 178 {
 179     XSetWindowAttributes wa;
 180
 181     /* init cursors */
 182     drawcontext->cursor[CurNormal] = XCreateFontCursor(disp, XC_left_ptr);
 183     drawcontext->cursor[CurResize] = XCreateFontCursor(disp, XC_sizing);
 184     drawcontext->cursor[CurMove] = XCreateFontCursor(disp, XC_fleur);
 185
 186     /* select for events */
 187     wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
 188         | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
 189     wa.cursor = drawcontext->cursor[CurNormal];
 190
 191     XChangeWindowAttributes(disp, RootWindow(disp, screen), CWEventMask | CWCursor, &wa);
 192
 193     XSelectInput(disp, RootWindow(disp, screen), wa.event_mask);
 194
 195     grabkeys(disp, screen, awesomeconf);
 196
 197     compileregs(awesomeconf->rules, awesomeconf->nrules);
 198
 199     /* bar */
 200     drawcontext->h = awesomeconf->statusbar.height = drawcontext->font.height + 2;
 201     initstatusbar(disp, screen, drawcontext, &awesomeconf->statusbar);
 202     drawcontext->gc = XCreateGC(disp, RootWindow(disp, screen), 0, 0);
 203     XSetLineAttributes(disp, drawcontext->gc, 1, LineSolid, CapButt, JoinMiter);
 204
 205     if(!drawcontext->font.set)
 206         XSetFont(disp, drawcontext->gc, drawcontext->font.xfont->fid);
 207
 208     loadawesomeprops(disp, awesomeconf);
 209 }
 210
 211 /** Startup Error handler to check if another window manager
 212  * is already running.
 213  * \param disp Display ref
 214  * \param ee Error event
 215  */
 216 static int __attribute__ ((noreturn))
 217 xerrorstart(Display * disp __attribute__ ((unused)), XErrorEvent * ee __attribute__ ((unused)))
 218 {
 219     eprint("awesome: another window manager is already running\n");
 220 }
 221
 222 /** Quit awesome
 223  * \param disp Display ref
 224  * \param screen Screen number
 225  * \param drawcontext Drawcontext ref
 226  * \param awesomeconf awesome config
 227  * \param arg nothing
 228  * \ingroup ui_callback
 229  */
 230 void
 231 uicb_quit(Display *disp __attribute__ ((unused)),
 232           DC *drawcontext __attribute__ ((unused)),
 233           awesome_config *awesomeconf __attribute__((unused)),
 234           const char *arg __attribute__ ((unused)))
 235 {
 236     readin = running = False;
 237 }
 238
 239 /* There's no way to check accesses to destroyed windows, thus those cases are
 240  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
 241  * default error handler, which may call exit.
 242  */
 243 int
 244 xerror(Display * edpy, XErrorEvent * ee)
 245 {
 246     if(ee->error_code == BadWindow
 247        || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
 248        || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
 249        || (ee->request_code == X_PolyFillRectangle
 250            && ee->error_code == BadDrawable)
 251        || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
 252        || (ee->request_code == X_ConfigureWindow
 253            && ee->error_code == BadMatch) || (ee->request_code == X_GrabKey
 254                                               && ee->error_code == BadAccess)
 255        || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
 256         return 0;
 257     fprintf(stderr, "awesome: fatal error: request code=%d, error code=%d\n",
 258             ee->request_code, ee->error_code);
 259
 260     return xerrorxlib(edpy, ee);        /* may call exit */
 261 }
 262
 263 /** Hello, this is main
 264  * \param argc who knows
 265  * \param argv who knows
 266  * \return EXIT_SUCCESS I hope
 267  */
 268 typedef void event_handler (XEvent *, awesome_config *);
 269 int
 270 main(int argc, char *argv[])
 271 {
 272     char *p;
 273     int r, xfd, e_dummy;
 274     fd_set rd;
 275     XEvent ev;
 276     Display * dpy;
 277     awesome_config *awesomeconf;
 278     int shape_event, randr_event_base;
 279     int screen;
 280     enum { NetSupported, NetWMName, NetLast };   /* EWMH atoms */
 281     Atom netatom[NetLast];
 282     event_handler **handler;
 283
 284     if(argc == 2 && !a_strcmp("-v", argv[1]))
 285     {
 286         printf("awesome-" VERSION " © 2007 Julien Danjou\n");
 287         return EXIT_SUCCESS;
 288     }
 289     else if(argc != 1)
 290         eprint("usage: awesome [-v]\n");
 291
 292     /* Tag won't be printed otherwised */
 293     setlocale(LC_CTYPE, "");
 294
 295     if(!(dpy = XOpenDisplay(NULL)))
 296         eprint("awesome: cannot open display\n");
 297
 298     xfd = ConnectionNumber(dpy);
 299
 300     XSetErrorHandler(xerrorstart);
 301     for(screen = 0; screen < ScreenCount(dpy); screen++)
 302         /* this causes an error if some other window manager is running */
 303         XSelectInput(dpy, RootWindow(dpy, screen), SubstructureRedirectMask);
 304
 305     /* need to XSync to validate errorhandler */
 306     XSync(dpy, False);
 307     XSetErrorHandler(NULL);
 308     xerrorxlib = XSetErrorHandler(xerror);
 309     XSync(dpy, False);
 310
 311     netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 312     netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 313
 314     /* allocate stuff */
 315     dc = p_new(DC, ScreenCount(dpy));
 316     awesomeconf = p_new(awesome_config, ScreenCount(dpy));
 317
 318     for(screen = 0; screen < ScreenCount(dpy); screen++)
 319     {
 320         parse_config(dpy, screen, &dc[screen], &awesomeconf[screen]);
 321         setup(dpy, screen, &dc[screen], &awesomeconf[screen]);
 322         XChangeProperty(dpy, RootWindow(dpy, screen), netatom[NetSupported],
 323                         XA_ATOM, 32, PropModeReplace, (unsigned char *) netatom, NetLast);
 324         drawstatusbar(dpy, &dc[screen], &awesomeconf[screen]);
 325     }
 326
 327     handler = p_new(event_handler *, LASTEvent);
 328     handler[ButtonPress] = handle_event_buttonpress;
 329     handler[ConfigureRequest] = handle_event_configurerequest;
 330     handler[ConfigureNotify] = handle_event_configurenotify;
 331     handler[DestroyNotify] = handle_event_destroynotify;
 332     handler[EnterNotify] = handle_event_enternotify;
 333     handler[LeaveNotify] = handle_event_leavenotify;
 334     handler[Expose] = handle_event_expose;
 335     handler[KeyPress] = handle_event_keypress;
 336     handler[MappingNotify] = handle_event_mappingnotify;
 337     handler[MapRequest] = handle_event_maprequest;
 338     handler[PropertyNotify] = handle_event_propertynotify;
 339     handler[UnmapNotify] = handle_event_unmapnotify;
 340
 341     /* check for shape extension */
 342     if((awesomeconf[0].have_shape = XShapeQueryExtension(dpy, &shape_event, &e_dummy)))
 343     {
 344         p_realloc(&handler, shape_event + 1);
 345         handler[shape_event] = handle_event_shape;
 346     }
 347
 348     /* check for randr extension */
 349     if((awesomeconf[0].have_randr = XRRQueryExtension(dpy, &randr_event_base, &e_dummy)))
 350     {
 351         p_realloc(&handler, randr_event_base + RRScreenChangeNotify + 1);
 352         handler[randr_event_base + RRScreenChangeNotify] = handle_event_randr_screen_change_notify;
 353     }
 354
 355     for(screen = 0; screen < ScreenCount(dpy); screen++)
 356     {
 357         awesomeconf[screen].have_shape = awesomeconf[0].have_shape;
 358         awesomeconf[screen].have_randr = awesomeconf[0].have_randr;
 359         scan(dpy, screen, &dc[screen], &awesomeconf[screen]);
 360     }
 361
 362     XSync(dpy, False);
 363
 364     /* main event loop, also reads status text from stdin */
 365     while(running)
 366     {
 367         FD_ZERO(&rd);
 368         if(readin)
 369             FD_SET(STDIN_FILENO, &rd);
 370         FD_SET(xfd, &rd);
 371         if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1)
 372         {
 373             if(errno == EINTR)
 374                 continue;
 375             eprint("select failed\n");
 376         }
 377         if(FD_ISSET(STDIN_FILENO, &rd))
 378         {
 379             switch (r = read(STDIN_FILENO, awesomeconf[0].statustext, sizeof(awesomeconf[0].statustext) - 1))
 380             {
 381             case -1:
 382                 a_strncpy(awesomeconf[0].statustext, sizeof(awesomeconf[0].statustext),
 383                           strerror(errno), sizeof(awesomeconf[0].statustext) - 1);
 384                 awesomeconf[0].statustext[sizeof(awesomeconf[0].statustext) - 1] = '\0';
 385                 readin = False;
 386                 break;
 387             case 0:
 388                 a_strncpy(awesomeconf[0].statustext, sizeof(awesomeconf[0].statustext),
 389                           "EOF", 4);
 390                 readin = False;
 391                 break;
 392             default:
 393                 for(awesomeconf[0].statustext[r] = '\0', p = awesomeconf[0].statustext + a_strlen(awesomeconf[0].statustext) - 1;
 394                     p >= awesomeconf[0].statustext && *p == '\n'; *p-- = '\0');
 395                 for(; p >= awesomeconf[0].statustext && *p != '\n'; --p);
 396                 if(p > awesomeconf[0].statustext)
 397                     a_strncpy(awesomeconf[0].statustext, sizeof(awesomeconf[0].statustext),
 398                               p + 1, sizeof(awesomeconf[0].statustext));
 399             }
 400             drawstatusbar(dpy, &dc[0], &awesomeconf[0]);
 401         }
 402
 403         while(XPending(dpy))
 404         {
 405             XNextEvent(dpy, &ev);
 406             if(handler[ev.type])
 407                 handler[ev.type](&ev, awesomeconf);       /* call handler */
 408         }
 409     }
 410     cleanup(dpy, dc, awesomeconf);
 411     XCloseDisplay(dpy);
 412
 413     return EXIT_SUCCESS;
 414 }