/*

 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>

 * See LICENSE file for license details.

 */

#include "dwm.h"

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <sys/select.h>

#include <X11/cursorfont.h>

#include <X11/keysym.h>

#include <X11/Xatom.h>

#include <X11/Xproto.h>

/* static */

static int (*xerrorxlib)(Display *, XErrorEvent *);

static Bool otherwm, readin;

static void

cleanup()

{

	close(STDIN_FILENO);

	while(sel) {

		resize(sel, True, TopLeft);

		unmanage(sel);

	}

	if(dc.font.set)

		XFreeFontSet(dpy, dc.font.set);

	else

		XFreeFont(dpy, dc.font.xfont);

	XUngrabKey(dpy, AnyKey, AnyModifier, root);

	XFreePixmap(dpy, dc.drawable);

	XFreeGC(dpy, dc.gc);

	XDestroyWindow(dpy, barwin);

	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);

	XSync(dpy, False);

}

static void

scan()

{

	unsigned int i, num;

	Window *wins, d1, d2;

	XWindowAttributes wa;

	wins = NULL;

	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(wins[i], &wa);

		}

	}

	if(wins)

		XFree(wins);

}

/*

 * Startup Error handler to check if another window manager

 * is already running.

 */

static int

xerrorstart(Display *dsply, XErrorEvent *ee)

{

	otherwm = True;

	return -1;

}

/* extern */

int

getproto(Window w)

{

	int i, format, protos, status;

	unsigned long extra, res;

	Atom *protocols, real;

	protos = 0;

	status = XGetWindowProperty(dpy, w, wmatom[WMProtocols], 0L, 20L, False,

			XA_ATOM, &real, &format, &res, &extra, (unsigned char **)&protocols);

	if(status != Success || protocols == 0)

		return protos;

	for(i = 0; i < res; i++)

		if(protocols[i] == wmatom[WMDelete])

			protos |= PROTODELWIN;

	free(protocols);

	return protos;

}

void

sendevent(Window w, Atom a, long value)

{

	XEvent e;

	e.type = ClientMessage;

	e.xclient.window = w;

	e.xclient.message_type = a;

	e.xclient.format = 32;

	e.xclient.data.l[0] = value;

	e.xclient.data.l[1] = CurrentTime;

	XSendEvent(dpy, w, False, NoEventMask, &e);

	XSync(dpy, False);

}

void

quit(Arg *arg)

{

	readin = running = False;

}

/*

 * There's no way to check accesses to destroyed windows, thus those cases are

 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs

 * default error handler, which calls exit().

 */

int

xerror(Display *dpy, XErrorEvent *ee)

{

	if(ee->error_code == BadWindow

	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)

	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)

	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)

	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)

	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)

	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess))

		return 0;

	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",

		ee->request_code, ee->error_code);

	return xerrorxlib(dpy, ee); /* may call exit() */

}

int

main(int argc, char *argv[])

{

	fd_set rd;

	if(argc == 2 && !strncmp("-v", argv[1], 3)) {

		fputs("dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);

		exit(EXIT_SUCCESS);

	}

	else if(argc != 1)

		eprint("usage: dwm [-v]\n");

	dpy = XOpenDisplay(0);

	if(!dpy)

		eprint("dwm: cannot open display\n");

	xfd = ConnectionNumber(dpy);

	screen = DefaultScreen(dpy);

	root = RootWindow(dpy, screen);

	otherwm = False;

	XSetErrorHandler(xerrorstart);

	/* this causes an error if some other window manager is running */

	XSelectInput(dpy, root, SubstructureRedirectMask);

	XSync(dpy, False);

	if(otherwm)

		eprint("dwm: another window manager is already running\n");

	XSync(dpy, False);

	XSetErrorHandler(NULL);

	xerrorxlib = XSetErrorHandler(xerror);

	XSync(dpy, False);

	drawstatus();

	scan();

	/* main event loop, also reads status text from stdin */

	XSync(dpy, False);

	procevent();

	readin = True;

	while(running) {

		FD_ZERO(&rd);

		if(readin)

			FD_SET(STDIN_FILENO, &rd);

		FD_SET(xfd, &rd);

			continue;

			if(readin && FD_ISSET(STDIN_FILENO, &rd)) {

				readin = NULL != fgets(stext, sizeof(stext), stdin);

				if(readin)

					stext[strlen(stext) - 1] = 0;

				else 

					strcpy(stext, "broken pipe");

				drawstatus();

			}

		}

			eprint("select failed\n");

		procevent();

	}

	cleanup();

	XCloseDisplay(dpy);

	return 0;

}