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