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