initial import

1 files changed, 264 insertions, 0 deletions

diff --git a/wm.c b/wm.c
new file mode 100644
index 0000000..de5324c
--- /dev/null
+++ b/wm.c
@@ -0,0 +1,264 @@
+/*
+ * (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;
+}