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 "dwm.h"
 15
 16/********** CUSTOMIZE **********/
 17
 18char *tags[TLast] = {
 19	[Tscratch] = "scratch",
 20	[Tdev] = "dev",
 21	[Tirc] = "irc",
 22	[Twww] = "www",
 23	[Twork] = "work",
 24};
 25
 26/********** CUSTOMIZE **********/
 27
 28/* X structs */
 29Display *dpy;
 30Window root, barwin;
 31Atom wm_atom[WMLast], net_atom[NetLast];
 32Cursor cursor[CurLast];
 33Bool running = True;
 34Bool issel;
 35
 36char stext[1024];
 37int tsel = Tdev; /* default tag */
 38int screen, sx, sy, sw, sh, th;
 39
 40DC dc = {0};
 41Client *clients = NULL;
 42Client *stack = NULL;
 43
 44static Bool other_wm_running;
 45static const char version[] =
 46	"dwm - " VERSION ", (C)opyright MMVI Anselm R. Garbe\n";
 47static int (*x_error_handler) (Display *, XErrorEvent *);
 48
 49static void
 50usage() {	error("usage: dwm [-v]\n"); }
 51
 52static void
 53scan_wins()
 54{
 55	unsigned int i, num;
 56	Window *wins;
 57	XWindowAttributes wa;
 58	Window d1, d2;
 59
 60	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 61		for(i = 0; i < num; i++) {
 62			if(!XGetWindowAttributes(dpy, wins[i], &wa))
 63				continue;
 64			if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 65				continue;
 66			if(wa.map_state == IsViewable)
 67				manage(wins[i], &wa);
 68		}
 69	}
 70	if(wins)
 71		XFree(wins);
 72}
 73
 74static int
 75win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
 76{
 77	Atom real;
 78	int format;
 79	unsigned long res, extra;
 80	int status;
 81
 82	status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
 83			&res, &extra, prop);
 84
 85	if(status != Success || *prop == 0) {
 86		return 0;
 87	}
 88	if(res == 0) {
 89		free((void *) *prop);
 90	}
 91	return res;
 92}
 93
 94int
 95win_proto(Window w)
 96{
 97	unsigned char *protocols;
 98	long res;
 99	int protos = 0;
100	int i;
101
102	res = win_property(w, wm_atom[WMProtocols], XA_ATOM, 20L, &protocols);
103	if(res <= 0) {
104		return protos;
105	}
106	for(i = 0; i < res; i++) {
107		if(protocols[i] == wm_atom[WMDelete])
108			protos |= WM_PROTOCOL_DELWIN;
109	}
110	free((char *) protocols);
111	return protos;
112}
113
114void
115send_message(Window w, Atom a, long value)
116{
117	XEvent e;
118
119	e.type = ClientMessage;
120	e.xclient.window = w;
121	e.xclient.message_type = a;
122	e.xclient.format = 32;
123	e.xclient.data.l[0] = value;
124	e.xclient.data.l[1] = CurrentTime;
125	XSendEvent(dpy, w, False, NoEventMask, &e);
126	XFlush(dpy);
127}
128
129/*
130 * There's no way to check accesses to destroyed windows, thus
131 * those cases are ignored (especially on UnmapNotify's).
132 * Other types of errors call Xlib's default error handler, which
133 * calls exit().
134 */
135int
136error_handler(Display *dpy, XErrorEvent *error)
137{
138	if(error->error_code == BadWindow
139			|| (error->request_code == X_SetInputFocus
140				&& error->error_code == BadMatch)
141			|| (error->request_code == X_PolyText8
142				&& error->error_code == BadDrawable)
143			|| (error->request_code == X_PolyFillRectangle
144				&& error->error_code == BadDrawable)
145			|| (error->request_code == X_PolySegment
146				&& error->error_code == BadDrawable)
147			|| (error->request_code == X_ConfigureWindow
148				&& error->error_code == BadMatch)
149			|| (error->request_code == X_GrabKey
150				&& error->error_code == BadAccess))
151		return 0;
152	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
153			error->request_code, error->error_code);
154	return x_error_handler(dpy, error); /* may call exit() */
155}
156
157/*
158 * Startup Error handler to check if another window manager
159 * is already running.
160 */
161static int
162startup_error_handler(Display *dpy, XErrorEvent *error)
163{
164	other_wm_running = True;
165	return -1;
166}
167
168static void
169cleanup()
170{
171	while(clients)
172		unmanage(clients);
173	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
174}
175
176void
177quit(void *aux)
178{
179	running = False;
180}
181
182int
183main(int argc, char *argv[])
184{
185	int i;
186	XSetWindowAttributes wa;
187	unsigned int mask;
188	Window w;
189	XEvent ev;
190
191	/* command line args */
192	for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
193		switch (argv[i][1]) {
194		case 'v':
195			fprintf(stdout, "%s", version);
196			exit(0);
197			break;
198		default:
199			usage();
200			break;
201		}
202	}
203
204	dpy = XOpenDisplay(0);
205	if(!dpy)
206		error("dwm: cannot connect X server\n");
207
208	screen = DefaultScreen(dpy);
209	root = RootWindow(dpy, screen);
210
211	/* check if another WM is already running */
212	other_wm_running = False;
213	XSetErrorHandler(startup_error_handler);
214	/* this causes an error if some other WM is running */
215	XSelectInput(dpy, root, SubstructureRedirectMask);
216	XFlush(dpy);
217
218	if(other_wm_running)
219		error("dwm: another window manager is already running\n");
220
221	sx = sy = 0;
222	sw = DisplayWidth(dpy, screen);
223	sh = DisplayHeight(dpy, screen);
224	issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
225
226	XSetErrorHandler(0);
227	x_error_handler = XSetErrorHandler(error_handler);
228
229	/* init atoms */
230	wm_atom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
231	wm_atom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
232	net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
233	net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
234
235	XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
236			PropModeReplace, (unsigned char *) net_atom, NetLast);
237
238
239	/* init cursors */
240	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
241	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
242	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
243
244	update_keys();
245
246	/* style */
247	dc.bg = initcolor(BGCOLOR);
248	dc.fg = initcolor(FGCOLOR);
249	dc.border = initcolor(BORDERCOLOR);
250	initfont(FONT);
251
252	th = dc.font.height + 4;
253
254	dc.drawable = XCreatePixmap(dpy, root, sw, th, DefaultDepth(dpy, screen));
255	dc.gc = XCreateGC(dpy, root, 0, 0);
256
257	wa.event_mask = SubstructureRedirectMask | EnterWindowMask \
258					| LeaveWindowMask;
259	wa.cursor = cursor[CurNormal];
260	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
261
262	scan_wins();
263
264	while(running) {
265		XNextEvent(dpy, &ev);
266		if(handler[ev.type])
267			(handler[ev.type])(&ev); /* call handler */
268	}
269
270	cleanup();
271	XCloseDisplay(dpy);
272
273	return 0;
274}