LICENSE


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MIT/X Consortium License

(C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
(C)opyright MMVI Sander van Dijk <a dot h dot vandijk at gmail dot com>

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the 
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in 
all copies or substantial portions of the Software. 

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL 
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
DEALINGS IN THE SOFTWARE.
/*
 * (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 <X11/cursorfont.h>
#include <X11/Xatom.h>
#include <X11/Xproto.h>


/* static */

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

static void
cleanup()
{
	while(sel) {
		resize(sel, True, TopLeft);
		unmanage(sel);
	}
	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
}

static void
scan()
{
	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(wins[i], &wa);
		}
	}
	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;
}

/*
 * Startup Error handler to check if another window manager
 * is already running.
 */
static int
xerrorstart(Display *dsply, XErrorEvent *ee)
{
	otherwm = True;
	return -1;
}

/* extern */

char stext[1024];
int tsel = Tdev; /* default tag */
int screen, sx, sy, sw, sh, bx, by, bw, bh, mw;
Atom wmatom[WMLast], netatom[NetLast];
Bool running = True;
Bool issel = True;
Client *clients = NULL;
Client *sel = NULL;
Cursor cursor[CurLast];
Display *dpy;
DC dc = {0};
Window root, barwin;

int
getproto(Window w)
{
	unsigned char *protocols;
	long res;
	int protos = 0;
	int i;

	res = win_property(w, wmatom[WMProtocols], XA_ATOM, 20L, &protocols);
	if(res <= 0) {
		return protos;
	}
	for(i = 0; i < res; i++) {
		if(protocols[i] == wmatom[WMDelete])
			protos |= WM_PROTOCOL_DELWIN;
	}
	free((char *) 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)
{
	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[])
{
	int i, n;
	fd_set rd;
	XSetWindowAttributes wa;
	unsigned int mask;
	Bool readstdin = True;
	Window w;
	XEvent ev;

	for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
		switch (argv[i][1]) {
		default:
			eprint("usage: dwm [-v]\n");
			break;
		case 'v':
			fputs("dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
			exit(EXIT_SUCCESS);
			break;
		}
	}

	dpy = XOpenDisplay(0);
	if(!dpy)
		eprint("dwm: cannot connect X server\n");

	screen = DefaultScreen(dpy);
	root = RootWindow(dpy, screen);

	/* check if another WM is already running */
	otherwm = False;
	XSetErrorHandler(xerrorstart);
	/* this causes an error if some other WM is running */
	XSelectInput(dpy, root, SubstructureRedirectMask);
	XSync(dpy, False);

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

	XSetErrorHandler(NULL);
	xerrorxlib = XSetErrorHandler(xerror);

	/* init atoms */
	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
			PropModeReplace, (unsigned char *) netatom, NetLast);

	/* init cursors */
	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);

	grabkeys();

	/* style */
	dc.bg = getcolor(BGCOLOR);
	dc.fg = getcolor(FGCOLOR);
	dc.border = getcolor(BORDERCOLOR);
	setfont(FONT);

	sx = sy = 0;
	sw = DisplayWidth(dpy, screen);
	sh = DisplayHeight(dpy, screen);
	mw = (sw * MASTERW) / 100;

	wa.override_redirect = 1;
	wa.background_pixmap = ParentRelative;
	wa.event_mask = ButtonPressMask | ExposureMask;

	bx = by = 0;
	bw = sw;
	dc.h = bh = dc.font.height + 4;
	barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
			CopyFromParent, DefaultVisual(dpy, screen),
			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
	XDefineCursor(dpy, barwin, cursor[CurNormal]);
	XMapRaised(dpy, barwin);

	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
	dc.gc = XCreateGC(dpy, root, 0, 0);
	drawstatus();

	issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);

	wa.event_mask = SubstructureRedirectMask | EnterWindowMask \
					| LeaveWindowMask;
	wa.cursor = cursor[CurNormal];

	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);

	strcpy(stext, "dwm-"VERSION);

	scan();

	/* main event loop, reads status text from stdin as well */
Mainloop:
	while(running) {
		FD_ZERO(&rd);
		if(readstdin)
			FD_SET(STDIN_FILENO, &rd);
		FD_SET(ConnectionNumber(dpy), &rd);

		i = select(ConnectionNumber(dpy) + 1, &rd, 0, 0, 0);
		if(i == -1 && errno == EINTR)
			continue;
		if(i < 0)
			eprint("select failed\n");
		else if(i > 0) {
			if(FD_ISSET(ConnectionNumber(dpy), &rd)) {
				while(XPending(dpy)) {
					XNextEvent(dpy, &ev);
					if(handler[ev.type])
						(handler[ev.type])(&ev); /* call handler */
				}
			}
			if(readstdin && FD_ISSET(STDIN_FILENO, &rd)) {
				i = n = 0;
				for(;;) {
					if((i = getchar()) == EOF) {
						/* broken pipe/end of producer */
						readstdin = False;
						strcpy(stext, "broken pipe");
						goto Mainloop;
					}
					if(i == '\n' || n >= sizeof(stext) - 1)
						break;
					stext[n++] = i;
				}
				stext[n] = 0;
				drawstatus();
			}
		}
	}

	cleanup();
	XCloseDisplay(dpy);

	return 0;
}