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
  8#include <errno.h>
  9#include <stdio.h>
 10#include <stdlib.h>
 11#include <string.h>
 12#include <unistd.h>
 13#include <X11/cursorfont.h>
 14#include <X11/Xatom.h>
 15#include <X11/Xproto.h>
 16
 17Display *dpy;
 18Window root, barwin;
 19Atom wm_atom[WMLast], net_atom[NetLast];
 20Cursor cursor[CurLast];
 21Bool running = True;
 22Bool issel;
 23
 24int tsel = Tdev; /* default tag */
 25int screen, sx, sy, sw, sh, bx, by, bw, bh, mw;
 26char stext[1024];
 27
 28DC dc = {0};
 29Client *clients = NULL;
 30Client *sel = NULL;
 31
 32static Bool otherwm;
 33static const char version[] =
 34	"dwm-" VERSION ", (C)opyright MMVI Anselm R. Garbe\n";
 35static int (*xerrorxlib)(Display *, XErrorEvent *);
 36
 37/* static functions */
 38
 39static void
 40cleanup()
 41{
 42	while(sel) {
 43		resize(sel, True);
 44		unmanage(sel);
 45	}
 46	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 47}
 48
 49static void
 50scan()
 51{
 52	unsigned int i, num;
 53	Window *wins;
 54	XWindowAttributes wa;
 55	Window d1, d2;
 56
 57	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 58		for(i = 0; i < num; i++) {
 59			if(!XGetWindowAttributes(dpy, wins[i], &wa))
 60				continue;
 61			if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 62				continue;
 63			if(wa.map_state == IsViewable)
 64				manage(wins[i], &wa);
 65		}
 66	}
 67	if(wins)
 68		XFree(wins);
 69}
 70
 71static int
 72win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
 73{
 74	Atom real;
 75	int format;
 76	unsigned long res, extra;
 77	int status;
 78
 79	status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
 80			&res, &extra, prop);
 81
 82	if(status != Success || *prop == 0) {
 83		return 0;
 84	}
 85	if(res == 0) {
 86		free((void *) *prop);
 87	}
 88	return res;
 89}
 90
 91/*
 92 * Startup Error handler to check if another window manager
 93 * is already running.
 94 */
 95static int
 96xerrorstart(Display *dsply, XErrorEvent *ee)
 97{
 98	otherwm = True;
 99	return -1;
100}
101
102/* extern functions */
103
104int
105getproto(Window w)
106{
107	unsigned char *protocols;
108	long res;
109	int protos = 0;
110	int i;
111
112	res = win_property(w, wm_atom[WMProtocols], XA_ATOM, 20L, &protocols);
113	if(res <= 0) {
114		return protos;
115	}
116	for(i = 0; i < res; i++) {
117		if(protocols[i] == wm_atom[WMDelete])
118			protos |= WM_PROTOCOL_DELWIN;
119	}
120	free((char *) protocols);
121	return protos;
122}
123
124void
125sendevent(Window w, Atom a, long value)
126{
127	XEvent e;
128
129	e.type = ClientMessage;
130	e.xclient.window = w;
131	e.xclient.message_type = a;
132	e.xclient.format = 32;
133	e.xclient.data.l[0] = value;
134	e.xclient.data.l[1] = CurrentTime;
135	XSendEvent(dpy, w, False, NoEventMask, &e);
136	XFlush(dpy);
137}
138
139void
140quit(Arg *arg)
141{
142	running = False;
143}
144
145/*
146 * There's no way to check accesses to destroyed windows, thus
147 * those cases are ignored (especially on UnmapNotify's).
148 * Other types of errors call Xlib's default error handler, which
149 * calls exit().
150 */
151int
152xerror(Display *dpy, XErrorEvent *ee)
153{
154	if(ee->error_code == BadWindow
155			|| (ee->request_code == X_SetInputFocus
156				&& ee->error_code == BadMatch)
157			|| (ee->request_code == X_PolyText8
158				&& ee->error_code == BadDrawable)
159			|| (ee->request_code == X_PolyFillRectangle
160				&& ee->error_code == BadDrawable)
161			|| (ee->request_code == X_PolySegment
162				&& ee->error_code == BadDrawable)
163			|| (ee->request_code == X_ConfigureWindow
164				&& ee->error_code == BadMatch)
165			|| (ee->request_code == X_GrabKey
166				&& ee->error_code == BadAccess))
167		return 0;
168	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
169			ee->request_code, ee->error_code);
170	return xerrorxlib(dpy, ee); /* may call exit() */
171}
172
173int
174main(int argc, char *argv[])
175{
176	int i, n;
177	fd_set rd;
178	XSetWindowAttributes wa;
179	unsigned int mask;
180	Bool readstdin = True;
181	Window w;
182	XEvent ev;
183
184	for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
185		switch (argv[i][1]) {
186		case 'v':
187			fprintf(stdout, "%s", version);
188			exit(0);
189			break;
190		default:
191			eprint("usage: dwm [-v]\n");
192			break;
193		}
194	}
195
196	dpy = XOpenDisplay(0);
197	if(!dpy)
198		eprint("dwm: cannot connect X server\n");
199
200	screen = DefaultScreen(dpy);
201	root = RootWindow(dpy, screen);
202
203	/* check if another WM is already running */
204	otherwm = False;
205	XSetErrorHandler(xerrorstart);
206	/* this causes an error if some other WM is running */
207	XSelectInput(dpy, root, SubstructureRedirectMask);
208	XFlush(dpy);
209
210	if(otherwm)
211		eprint("dwm: another window manager is already running\n");
212
213	XSetErrorHandler(0);
214	xerrorxlib = XSetErrorHandler(xerror);
215
216	/* init atoms */
217	wm_atom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
218	wm_atom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
219	net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
220	net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
221	XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
222			PropModeReplace, (unsigned char *) net_atom, NetLast);
223
224	/* init cursors */
225	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
226	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
227	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
228
229	grabkeys();
230
231	/* style */
232	dc.bg = getcolor(BGCOLOR);
233	dc.fg = getcolor(FGCOLOR);
234	dc.border = getcolor(BORDERCOLOR);
235	setfont(FONT);
236
237	sx = sy = 0;
238	sw = DisplayWidth(dpy, screen);
239	sh = DisplayHeight(dpy, screen);
240	mw = (sw * MASTERW) / 100;
241
242	wa.override_redirect = 1;
243	wa.background_pixmap = ParentRelative;
244	wa.event_mask = ButtonPressMask | ExposureMask;
245
246	bx = by = 0;
247	bw = sw;
248	dc.h = bh = dc.font.height + 4;
249	barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
250			CopyFromParent, DefaultVisual(dpy, screen),
251			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
252	XDefineCursor(dpy, barwin, cursor[CurNormal]);
253	XMapRaised(dpy, barwin);
254
255	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
256	dc.gc = XCreateGC(dpy, root, 0, 0);
257	drawstatus();
258
259	issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
260
261	wa.event_mask = SubstructureRedirectMask | EnterWindowMask \
262					| LeaveWindowMask;
263	wa.cursor = cursor[CurNormal];
264
265	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
266
267	strcpy(stext, "dwm-"VERSION);
268	scan();
269
270	/* main event loop, reads status text from stdin as well */
271Mainloop:
272	while(running) {
273		FD_ZERO(&rd);
274		if(readstdin)
275			FD_SET(STDIN_FILENO, &rd);
276		FD_SET(ConnectionNumber(dpy), &rd);
277
278		i = select(ConnectionNumber(dpy) + 1, &rd, 0, 0, 0);
279		if(i == -1 && errno == EINTR)
280			continue;
281		if(i < 0)
282			eprint("select failed\n");
283		else if(i > 0) {
284			if(FD_ISSET(ConnectionNumber(dpy), &rd)) {
285				while(XPending(dpy)) {
286					XNextEvent(dpy, &ev);
287					if(handler[ev.type])
288						(handler[ev.type])(&ev); /* call handler */
289				}
290			}
291			if(readstdin && FD_ISSET(STDIN_FILENO, &rd)) {
292				i = n = 0;
293				for(;;) {
294					if((i = getchar()) == EOF) {
295						/* broken pipe/end of producer */
296						readstdin = False;
297						strcpy(stext, "broken pipe");
298						goto Mainloop;
299					}
300					if(i == '\n' || n >= sizeof(stext) - 1)
301						break;
302					stext[n++] = i;
303				}
304				stext[n] = 0;
305				drawstatus();
306			}
307		}
308	}
309
310	cleanup();
311	XCloseDisplay(dpy);
312
313	return 0;
314}