+/*
+ * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
+ * See LICENSE file for license details.
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <X11/cursorfont.h>
+#include <X11/Xatom.h>
+#include <X11/Xproto.h>
+
+#include "wm.h"
+
+Display *dpy;
+Window root;
+XRectangle rect;
+int screen, sel_screen;
+Atom wm_atom[WMLast];
+Atom net_atom[NetLast];
+Cursor cursor[CurLast];
+unsigned int kmask, numlock_mask;
+Pixmap pmap;
+
+enum { WM_PROTOCOL_DELWIN = 1 };
+
+static Bool other_wm_running;
+static int (*x_error_handler) (Display *, XErrorEvent *);
+static char version[] = "gridwm - " VERSION ", (C)opyright MMVI Anselm R. Garbe\n";
+
+static void
+usage()
+{
+ fputs("usage: gridwm [-v]\n", stderr);
+ exit(1);
+}
+
+void
+error(char *errstr, ...) {
+ va_list ap;
+ va_start(ap, errstr);
+ vfprintf(stderr, errstr, ap);
+ va_end(ap);
+ exit(1);
+}
+
+static void
+scan_wins()
+{
+ unsigned int i, num;
+ Window *wins;
+ XWindowAttributes wa;
+ Window d1, d2;
+
+ if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
+ for(i = 0; i < num; i++) {
+ if(!XGetWindowAttributes(dpy, wins[i], &wa))
+ continue;
+ if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
+ continue;
+ if(wa.map_state == IsViewable)
+ /*manage*/;
+ }
+ }
+ if(wins)
+ XFree(wins);
+}
+
+static int
+win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
+{
+ Atom real;
+ int format;
+ unsigned long res, extra;
+ int status;
+
+ status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
+ &res, &extra, prop);
+
+ if(status != Success || *prop == 0) {
+ return 0;
+ }
+ if(res == 0) {
+ free((void *) *prop);
+ }
+ return res;
+}
+
+int
+win_proto(Window w)
+{
+ Atom *protocols;
+ long res;
+ int protos = 0;
+ int i;
+
+ res = win_property(w, wm_atom[WMProtocols], XA_ATOM, 20L,
+ ((unsigned char **) &protocols));
+ if(res <= 0) {
+ return protos;
+ }
+ for(i = 0; i < res; i++) {
+ if(protocols[i] == wm_atom[WMDelete])
+ protos |= WM_PROTOCOL_DELWIN;
+ }
+ free((char *) protocols);
+ return protos;
+}
+
+/*
+ * There's no way to check accesses to destroyed windows, thus
+ * those cases are ignored (especially on UnmapNotify's).
+ * Other types of errors call Xlib's default error handler, which
+ * calls exit().
+ */
+static int
+error_handler(Display *dpy, XErrorEvent *error)
+{
+ if(error->error_code == BadWindow
+ || (error->request_code == X_SetInputFocus
+ && error->error_code == BadMatch)
+ || (error->request_code == X_PolyText8
+ && error->error_code == BadDrawable)
+ || (error->request_code == X_PolyFillRectangle
+ && error->error_code == BadDrawable)
+ || (error->request_code == X_PolySegment
+ && error->error_code == BadDrawable)
+ || (error->request_code == X_ConfigureWindow
+ && error->error_code == BadMatch)
+ || (error->request_code == X_GrabKey
+ && error->error_code == BadAccess))
+ return 0;
+ fprintf(stderr, "gridwm: fatal error: request code=%d, error code=%d\n",
+ error->request_code, error->error_code);
+ return x_error_handler(dpy, error); /* may call exit() */
+}
+
+/*
+ * Startup Error handler to check if another window manager
+ * is already running.
+ */
+static int
+startup_error_handler(Display *dpy, XErrorEvent *error)
+{
+ other_wm_running = True;
+ return -1;
+}
+
+static void
+init_lock_keys()
+{
+ XModifierKeymap *modmap;
+ KeyCode numlock;
+ int i;
+ static int masks[] = {
+ ShiftMask, LockMask, ControlMask, Mod1Mask,
+ Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
+ };
+
+ numlock_mask = 0;
+ modmap = XGetModifierMapping(dpy);
+ numlock = XKeysymToKeycode(dpy, XStringToKeysym("Num_Lock"));
+
+ if(modmap && modmap->max_keypermod > 0) {
+ int max = (sizeof(masks) / sizeof(int)) * modmap->max_keypermod;
+ for(i = 0; i < max; i++)
+ if(numlock && (modmap->modifiermap[i] == numlock))
+ numlock_mask = masks[i / modmap->max_keypermod];
+ }
+ XFreeModifiermap(modmap);
+
+ kmask = 255 & ~(numlock_mask | LockMask);
+}
+
+static void
+cleanup()
+{
+ /*
+ Client *c;
+ for(c=client; c; c=c->next)
+ reparent_client(c, root, c->sel->rect.x, c->sel->rect.y);
+ XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
+ */
+}
+
+int
+main(int argc, char *argv[])
+{
+ int i;
+ XSetWindowAttributes wa;
+ unsigned int mask;
+ Window w;
+
+ /* command line args */
+ for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
+ switch (argv[i][1]) {
+ case 'v':
+ fprintf(stdout, "%s", version);
+ exit(0);
+ break;
+ default:
+ usage();
+ break;
+ }
+ }
+
+ dpy = XOpenDisplay(0);
+ if(!dpy)
+ error("gridwm: cannot connect X server\n");
+
+ screen = DefaultScreen(dpy);
+ root = RootWindow(dpy, screen);
+
+ /* check if another WM is already running */
+ other_wm_running = False;
+ XSetErrorHandler(startup_error_handler);
+ /* this causes an error if some other WM is running */
+ XSelectInput(dpy, root, SubstructureRedirectMask);
+ XSync(dpy, False);
+
+ if(other_wm_running)
+ error("gridwm: another window manager is already running\n");
+
+ rect.x = rect.y = 0;
+ rect.width = DisplayWidth(dpy, screen);
+ rect.height = DisplayHeight(dpy, screen);
+ sel_screen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
+
+ XSetErrorHandler(0);
+ x_error_handler = XSetErrorHandler(error_handler);
+
+ /* init atoms */
+ wm_atom[WMState] = XInternAtom(dpy, "WM_STATE", False);
+ wm_atom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
+ wm_atom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
+ net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
+ net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
+
+ XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
+ PropModeReplace, (unsigned char *) net_atom, NetLast);
+
+
+ /* init cursors */
+ cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
+ cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
+ cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
+
+ init_lock_keys();
+
+ pmap = XCreatePixmap(dpy, root, rect.width, rect.height,
+ DefaultDepth(dpy, screen));
+
+ wa.event_mask = SubstructureRedirectMask | EnterWindowMask | LeaveWindowMask;
+ wa.cursor = cursor[CurNormal];
+ XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
+
+ scan_wins();
+
+ cleanup();
+ XCloseDisplay(dpy);
+
+ return 0;
+}
Got questions, comments, patches, etc.? Contact Jason Woofenden