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, barwin;
  19 Atom wm_atom[WMLast], net_atom[NetLast];
  20 Cursor cursor[CurLast];
  21 XRectangle rect, barrect;
  22 Bool running = True;
  23 Client *client = NULL;
  24
  25 char *bartext, tag[256];
  26 int screen, sel_screen;
  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(create_client(wins[i], &wa));
  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 == NULL) {
  78                 return 0;
  79         }
  80         if(res == 0)
  81                 free((void *) *prop);
  82         return res;
  83 }
  84
  85 int
  86 win_proto(Window w)
  87 {
  88         Atom *protocols;
  89         long res;
  90         int protos = 0;
  91         int i;
  92
  93         res = win_property(w, wm_atom[WMProtocols], XA_ATOM, 20L,
  94                         ((unsigned char **) &protocols));
  95         if(res <= 0) {
  96                 return protos;
  97         }
  98         for(i = 0; i < res; i++) {
  99                 if(protocols[i] == wm_atom[WMDelete])
 100                         protos |= WM_PROTOCOL_DELWIN;
 101         }
 102         free((char *) protocols);
 103         return protos;
 104 }
 105
 106 /*
 107  * There's no way to check accesses to destroyed windows, thus
 108  * those cases are ignored (especially on UnmapNotify's).
 109  * Other types of errors call Xlib's default error handler, which
 110  * calls exit().
 111  */
 112 static int
 113 error_handler(Display *dpy, XErrorEvent *error)
 114 {
 115         if(error->error_code == BadWindow
 116                         || (error->request_code == X_SetInputFocus
 117                                 && error->error_code == BadMatch)
 118                         || (error->request_code == X_PolyText8
 119                                 && error->error_code == BadDrawable)
 120                         || (error->request_code == X_PolyFillRectangle
 121                                 && error->error_code == BadDrawable)
 122                         || (error->request_code == X_PolySegment
 123                                 && error->error_code == BadDrawable)
 124                         || (error->request_code == X_ConfigureWindow
 125                                 && error->error_code == BadMatch)
 126                         || (error->request_code == X_GrabKey
 127                                 && error->error_code == BadAccess))
 128                 return 0;
 129         fprintf(stderr, "gridwm: fatal error: request code=%d, error code=%d\n",
 130                         error->request_code, error->error_code);
 131         return x_error_handler(dpy, error); /* may call exit() */
 132 }
 133
 134 /*
 135  * Startup Error handler to check if another window manager
 136  * is already running.
 137  */
 138 static int
 139 startup_error_handler(Display *dpy, XErrorEvent *error)
 140 {
 141         other_wm_running = True;
 142         return -1;
 143 }
 144
 145 static void
 146 cleanup()
 147 {
 148         /*
 149         Client *c;
 150         for(c=client; c; c=c->next)
 151                 reparent_client(c, root, c->sel->rect.x, c->sel->rect.y);
 152         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 153         */
 154 }
 155
 156 int
 157 main(int argc, char *argv[])
 158 {
 159         int i;
 160         XSetWindowAttributes wa;
 161         unsigned int mask;
 162         Window w;
 163         XEvent ev;
 164
 165         /* command line args */
 166         for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
 167                 switch (argv[i][1]) {
 168                 case 'v':
 169                         fprintf(stdout, "%s", version);
 170                         exit(0);
 171                         break;
 172                 default:
 173                         usage();
 174                         break;
 175                 }
 176         }
 177
 178         dpy = XOpenDisplay(0);
 179         if(!dpy)
 180                 error("gridwm: cannot connect X server\n");
 181
 182         screen = DefaultScreen(dpy);
 183         root = RootWindow(dpy, screen);
 184
 185         /* check if another WM is already running */
 186         other_wm_running = False;
 187         XSetErrorHandler(startup_error_handler);
 188         /* this causes an error if some other WM is running */
 189         XSelectInput(dpy, root, SubstructureRedirectMask);
 190         XFlush(dpy);
 191
 192         if(other_wm_running)
 193                 error("gridwm: another window manager is already running\n");
 194
 195         rect.x = rect.y = 0;
 196         rect.width = DisplayWidth(dpy, screen);
 197         rect.height = DisplayHeight(dpy, screen);
 198         sel_screen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 199
 200         XSetErrorHandler(0);
 201         x_error_handler = XSetErrorHandler(error_handler);
 202
 203         /* init atoms */
 204         wm_atom[WMState] = XInternAtom(dpy, "WM_STATE", False);
 205         wm_atom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 206         wm_atom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 207         net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 208         net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 209
 210         XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
 211                         PropModeReplace, (unsigned char *) net_atom, NetLast);
 212
 213
 214         /* init cursors */
 215         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 216         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 217         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 218
 219         update_keys();
 220
 221         brush.drawable = XCreatePixmap(dpy, root, rect.width, rect.height,
 222                         DefaultDepth(dpy, screen));
 223         brush.gc = XCreateGC(dpy, root, 0, 0);
 224
 225         /* style */
 226         loadcolors(dpy, screen, &brush, BGCOLOR, FGCOLOR, BORDERCOLOR);
 227         loadfont(dpy, &brush.font, FONT);
 228
 229         wa.override_redirect = 1;
 230         wa.background_pixmap = ParentRelative;
 231         wa.event_mask = ExposureMask;
 232
 233         barrect = rect;
 234         barrect.height = labelheight(&brush.font);
 235         barrect.y = rect.height - barrect.height;
 236         barwin = XCreateWindow(dpy, root, barrect.x, barrect.y,
 237                         barrect.width, barrect.height, 0, DefaultDepth(dpy, screen),
 238                         CopyFromParent, DefaultVisual(dpy, screen),
 239                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 240         bartext = NULL;
 241         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 242         XMapRaised(dpy, barwin);
 243         draw_bar();
 244
 245         wa.event_mask = SubstructureRedirectMask | EnterWindowMask | LeaveWindowMask;
 246         wa.cursor = cursor[CurNormal];
 247         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 248
 249         scan_wins();
 250
 251         while(running) {
 252                 XNextEvent(dpy, &ev);
 253                 if(handler[ev.type])
 254                         (handler[ev.type]) (&ev); /* call handler */
 255         }
 256
 257         cleanup();
 258         XCloseDisplay(dpy);
 259
 260         return 0;
 261 }