1/*
  2 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
  3 * See LICENSE file for license details.
  4 */
  5
  6#include "dwm.h"
  7#include <errno.h>
  8#include <stdio.h>
  9#include <stdlib.h>
 10#include <string.h>
 11#include <unistd.h>
 12#include <sys/select.h>
 13#include <X11/cursorfont.h>
 14#include <X11/Xatom.h>
 15#include <X11/Xproto.h>
 16
 17/* static */
 18
 19static int (*xerrorxlib)(Display *, XErrorEvent *);
 20static Bool otherwm;
 21
 22static void
 23cleanup()
 24{
 25	ungrabkeys();
 26	while(sel) {
 27		resize(sel, True, TopLeft);
 28		unmanage(sel);
 29	}
 30	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 31}
 32
 33static void
 34scan()
 35{
 36	unsigned int i, num;
 37	Window *wins, d1, d2;
 38	XWindowAttributes wa;
 39
 40	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 41		for(i = 0; i < num; i++) {
 42			if(!XGetWindowAttributes(dpy, wins[i], &wa))
 43				continue;
 44			if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 45				continue;
 46			if(wa.map_state == IsViewable)
 47				manage(wins[i], &wa);
 48		}
 49	}
 50	if(wins)
 51		XFree(wins);
 52}
 53
 54static int
 55win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
 56{
 57	int status, format;
 58	unsigned long res, extra;
 59	Atom real;
 60
 61	status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
 62			&res, &extra, prop);
 63
 64	if(status != Success || *prop == 0) {
 65		return 0;
 66	}
 67	if(res == 0) {
 68		free((void *) *prop);
 69	}
 70	return res;
 71}
 72
 73/*
 74 * Startup Error handler to check if another window manager
 75 * is already running.
 76 */
 77static int
 78xerrorstart(Display *dsply, XErrorEvent *ee)
 79{
 80	otherwm = True;
 81	return -1;
 82}
 83
 84/* extern */
 85
 86char stext[1024];
 87Bool *seltag;
 88int screen, sx, sy, sw, sh, bx, by, bw, bh, mw;
 89unsigned int ntags;
 90Atom wmatom[WMLast], netatom[NetLast];
 91Bool running = True;
 92Bool issel = True;
 93Client *clients = NULL;
 94Client *sel = NULL;
 95Cursor cursor[CurLast];
 96Display *dpy;
 97DC dc = {0};
 98Window root, barwin;
 99
100int
101getproto(Window w)
102{
103	int protos = 0;
104	int i;
105	long res;
106	Atom *protocols;
107
108	res = win_property(w, wmatom[WMProtocols], XA_ATOM, 20L,
109			((unsigned char **)&protocols));
110	if(res <= 0) {
111		return protos;
112	}
113	for(i = 0; i < res; i++) {
114		if(protocols[i] == wmatom[WMDelete])
115			protos |= PROTODELWIN;
116	}
117	free((char *) protocols);
118	return protos;
119}
120
121void
122sendevent(Window w, Atom a, long value)
123{
124	XEvent e;
125
126	e.type = ClientMessage;
127	e.xclient.window = w;
128	e.xclient.message_type = a;
129	e.xclient.format = 32;
130	e.xclient.data.l[0] = value;
131	e.xclient.data.l[1] = CurrentTime;
132	XSendEvent(dpy, w, False, NoEventMask, &e);
133	XSync(dpy, False);
134}
135
136void
137quit(Arg *arg)
138{
139	running = False;
140}
141
142/*
143 * There's no way to check accesses to destroyed windows, thus those cases are
144 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
145 * default error handler, which calls exit().
146 */
147int
148xerror(Display *dpy, XErrorEvent *ee)
149{
150	if(ee->error_code == BadWindow
151	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
152	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
153	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
154	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
155	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
156	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess))
157		return 0;
158	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
159		ee->request_code, ee->error_code);
160	return xerrorxlib(dpy, ee); /* may call exit() */
161}
162
163int
164main(int argc, char *argv[])
165{
166	int i, xfd;
167	unsigned int mask;
168	fd_set rd;
169	Bool readin = True;
170	Window w;
171	XEvent ev;
172	XSetWindowAttributes wa;
173
174	if(argc == 2 && !strncmp("-v", argv[1], 3)) {
175		fputs("dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
176		exit(EXIT_SUCCESS);
177	}
178	else if(argc != 1)
179		eprint("usage: dwm [-v]\n");
180
181	dpy = XOpenDisplay(0);
182	if(!dpy)
183		eprint("dwm: cannot open display\n");
184
185	xfd = ConnectionNumber(dpy);
186	screen = DefaultScreen(dpy);
187	root = RootWindow(dpy, screen);
188
189	otherwm = False;
190	XSetErrorHandler(xerrorstart);
191	/* this causes an error if some other window manager is running */
192	XSelectInput(dpy, root, SubstructureRedirectMask);
193	XSync(dpy, False);
194
195	if(otherwm)
196		eprint("dwm: another window manager is already running\n");
197
198	XSetErrorHandler(NULL);
199	xerrorxlib = XSetErrorHandler(xerror);
200
201	/* init atoms */
202	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
203	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
204	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
205	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
206	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
207			PropModeReplace, (unsigned char *) netatom, NetLast);
208
209	/* init cursors */
210	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
211	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
212	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
213
214	grabkeys();
215	initrregs();
216
217	for(ntags = 0; tags[ntags]; ntags++);
218	seltag = emallocz(sizeof(Bool) * ntags);
219	seltag[DEFTAG] = True;
220
221	/* style */
222	dc.bg = getcolor(BGCOLOR);
223	dc.fg = getcolor(FGCOLOR);
224	dc.border = getcolor(BORDERCOLOR);
225	setfont(FONT);
226
227	sx = sy = 0;
228	sw = DisplayWidth(dpy, screen);
229	sh = DisplayHeight(dpy, screen);
230	mw = (sw * MASTERW) / 100;
231
232	wa.override_redirect = 1;
233	wa.background_pixmap = ParentRelative;
234	wa.event_mask = ButtonPressMask | ExposureMask;
235
236	bx = by = 0;
237	bw = sw;
238	dc.h = bh = dc.font.height + 4;
239	barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
240			CopyFromParent, DefaultVisual(dpy, screen),
241			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
242	XDefineCursor(dpy, barwin, cursor[CurNormal]);
243	XMapRaised(dpy, barwin);
244
245	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
246	dc.gc = XCreateGC(dpy, root, 0, 0);
247
248	strcpy(stext, "dwm-"VERSION);
249	drawstatus();
250
251	issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
252
253	wa.event_mask = SubstructureRedirectMask | EnterWindowMask | LeaveWindowMask;
254	wa.cursor = cursor[CurNormal];
255	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
256
257	scan();
258
259	/* main event loop, also reads status text from stdin */
260	XSync(dpy, False);
261	while(running) {
262		FD_ZERO(&rd);
263		if(readin)
264			FD_SET(STDIN_FILENO, &rd);
265		FD_SET(xfd, &rd);
266
267		i = select(xfd + 1, &rd, NULL, NULL, NULL);
268		if(i == -1 && errno == EINTR)
269			continue;
270		if(i < 0)
271			eprint("select failed\n");
272		else if(i > 0) {
273			if(FD_ISSET(xfd, &rd)) {
274				while(XPending(dpy)) {
275					XNextEvent(dpy, &ev);
276					if(handler[ev.type])
277						(handler[ev.type])(&ev); /* call handler */
278				}
279			}
280			if(readin && FD_ISSET(STDIN_FILENO, &rd)) {
281				readin = NULL != fgets(stext, sizeof(stext), stdin);
282				if(readin)
283					stext[strlen(stext) - 1] = 0;
284				else 
285					strcpy(stext, "broken pipe");
286				drawstatus();
287			}
288		}
289	}
290
291	cleanup();
292	XCloseDisplay(dpy);
293
294	return 0;
295}