wm.c

   1 /*
   2  * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
   3  * See LICENSE file for license details.
   4  */
   5
   6 #include <stdarg.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9
  10 #include <X11/cursorfont.h>
  11 #include <X11/Xatom.h>
  12 #include <X11/Xproto.h>
  13
  14 #include "wm.h"
  15
  16 /* X structs */
  17 Display *dpy;
  18 Window root;
  19 XRectangle rect;
  20 Pixmap pmap;
  21 Atom wm_atom[WMLast];
  22 Atom net_atom[NetLast];
  23 Cursor cursor[CurLast];
  24
  25 int screen, sel_screen;
  26 unsigned int kmask, numlock_mask;
  27
  28 /* draw structs */
  29 Brush brush = {0};
  30
  31 enum { WM_PROTOCOL_DELWIN = 1 };
  32
  33 static Bool other_wm_running;
  34 static int (*x_error_handler) (Display *, XErrorEvent *);
  35 static char version[] = "gridwm - " VERSION ", (C)opyright MMVI Anselm R. Garbe\n";
  36
  37 static void
  38 usage()
  39 {
  40         fputs("usage: gridwm [-v]\n", stderr);
  41         exit(1);
  42 }
  43
  44 static void
  45 scan_wins()
  46 {
  47         unsigned int i, num;
  48         Window *wins;
  49         XWindowAttributes wa;
  50         Window d1, d2;
  51
  52         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
  53                 for(i = 0; i < num; i++) {
  54                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
  55                                 continue;
  56                         if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
  57                                 continue;
  58                         if(wa.map_state == IsViewable)
  59                                 /*manage*/;
  60                 }
  61         }
  62         if(wins)
  63                 XFree(wins);
  64 }
  65
  66 static int
  67 win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
  68 {
  69         Atom real;
  70         int format;
  71         unsigned long res, extra;
  72         int status;
  73
  74         status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
  75                         &res, &extra, prop);
  76
  77         if(status != Success || *prop == 0) {
  78                 return 0;
  79         }
  80         if(res == 0) {
  81                 free((void *) *prop);
  82         }
  83         return res;
  84 }
  85
  86 int
  87 win_proto(Window w)
  88 {
  89         Atom *protocols;
  90         long res;
  91         int protos = 0;
  92         int i;
  93
  94         res = win_property(w, wm_atom[WMProtocols], XA_ATOM, 20L,
  95                         ((unsigned char **) &protocols));
  96         if(res <= 0) {
  97                 return protos;
  98         }
  99         for(i = 0; i < res; i++) {
 100                 if(protocols[i] == wm_atom[WMDelete])
 101                         protos |= WM_PROTOCOL_DELWIN;
 102         }
 103         free((char *) protocols);
 104         return protos;
 105 }
 106
 107 /*
 108  * There's no way to check accesses to destroyed windows, thus
 109  * those cases are ignored (especially on UnmapNotify's).
 110  * Other types of errors call Xlib's default error handler, which
 111  * calls exit().
 112  */
 113 static int
 114 error_handler(Display *dpy, XErrorEvent *error)
 115 {
 116         if(error->error_code == BadWindow
 117                         || (error->request_code == X_SetInputFocus
 118                                 && error->error_code == BadMatch)
 119                         || (error->request_code == X_PolyText8
 120                                 && error->error_code == BadDrawable)
 121                         || (error->request_code == X_PolyFillRectangle
 122                                 && error->error_code == BadDrawable)
 123                         || (error->request_code == X_PolySegment
 124                                 && error->error_code == BadDrawable)
 125                         || (error->request_code == X_ConfigureWindow
 126                                 && error->error_code == BadMatch)
 127                         || (error->request_code == X_GrabKey
 128                                 && error->error_code == BadAccess))
 129                 return 0;
 130         fprintf(stderr, "gridwm: fatal error: request code=%d, error code=%d\n",
 131                         error->request_code, error->error_code);
 132         return x_error_handler(dpy, error); /* may call exit() */
 133 }
 134
 135 /*
 136  * Startup Error handler to check if another window manager
 137  * is already running.
 138  */
 139 static int
 140 startup_error_handler(Display *dpy, XErrorEvent *error)
 141 {
 142         other_wm_running = True;
 143         return -1;
 144 }
 145
 146 static void
 147 init_lock_keys()
 148 {
 149         XModifierKeymap *modmap;
 150         KeyCode numlock;
 151         int i;
 152         static int masks[] = {
 153                 ShiftMask, LockMask, ControlMask, Mod1Mask,
 154                 Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
 155         };
 156
 157         numlock_mask = 0;
 158         modmap = XGetModifierMapping(dpy);
 159         numlock = XKeysymToKeycode(dpy, XStringToKeysym("Num_Lock"));
 160
 161         if(modmap && modmap->max_keypermod > 0) {
 162                 int max = (sizeof(masks) / sizeof(int)) * modmap->max_keypermod;
 163                 for(i = 0; i < max; i++)
 164                         if(numlock && (modmap->modifiermap[i] == numlock))
 165                                 numlock_mask = masks[i / modmap->max_keypermod];
 166         }
 167         XFreeModifiermap(modmap);
 168
 169         kmask = 255 & ~(numlock_mask | LockMask);
 170 }
 171
 172 static void
 173 cleanup()
 174 {
 175         /*
 176         Client *c;
 177         for(c=client; c; c=c->next)
 178                 reparent_client(c, root, c->sel->rect.x, c->sel->rect.y);
 179         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 180         */
 181 }
 182
 183 int
 184 main(int argc, char *argv[])
 185 {
 186         int i;
 187         XSetWindowAttributes wa;
 188         unsigned int mask;
 189         Window w;
 190
 191         /* command line args */
 192         for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
 193                 switch (argv[i][1]) {
 194                 case 'v':
 195                         fprintf(stdout, "%s", version);
 196                         exit(0);
 197                         break;
 198                 default:
 199                         usage();
 200                         break;
 201                 }
 202         }
 203
 204         dpy = XOpenDisplay(0);
 205         if(!dpy)
 206                 error("gridwm: cannot connect X server\n");
 207
 208         screen = DefaultScreen(dpy);
 209         root = RootWindow(dpy, screen);
 210
 211         /* check if another WM is already running */
 212         other_wm_running = False;
 213         XSetErrorHandler(startup_error_handler);
 214         /* this causes an error if some other WM is running */
 215         XSelectInput(dpy, root, SubstructureRedirectMask);
 216         XFlush(dpy);
 217
 218         if(other_wm_running)
 219                 error("gridwm: another window manager is already running\n");
 220
 221         rect.x = rect.y = 0;
 222         rect.width = DisplayWidth(dpy, screen);
 223         rect.height = DisplayHeight(dpy, screen);
 224         sel_screen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 225
 226         XSetErrorHandler(0);
 227         x_error_handler = XSetErrorHandler(error_handler);
 228
 229         /* init atoms */
 230         wm_atom[WMState] = XInternAtom(dpy, "WM_STATE", False);
 231         wm_atom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 232         wm_atom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 233         net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 234         net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 235
 236         XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
 237                         PropModeReplace, (unsigned char *) net_atom, NetLast);
 238
 239
 240         /* init cursors */
 241         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 242         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 243         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 244
 245         init_lock_keys();
 246
 247         pmap = XCreatePixmap(dpy, root, rect.width, rect.height,
 248                         DefaultDepth(dpy, screen));
 249
 250         wa.event_mask = SubstructureRedirectMask | EnterWindowMask | LeaveWindowMask;
 251         wa.cursor = cursor[CurNormal];
 252         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 253
 254         /* style */
 255         loadcolors(dpy, screen, &brush, BGCOLOR, FGCOLOR, BORDERCOLOR);
 256         loadfont(dpy, &brush.font, FONT);
 257
 258         scan_wins();
 259
 260         cleanup();
 261         XCloseDisplay(dpy);
 262
 263         return 0;
 264 }