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;
 22
 23static void
 24cleanup()
 25{
 26	while(sel) {
 27		resize(sel, True, TopLeft);
 28		unmanage(sel);
 29	}
 30	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 31	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 32	XSync(dpy, False);
 33}
 34
 35static void
 36scan()
 37{
 38	unsigned int i, num;
 39	Window *wins, d1, d2;
 40	XWindowAttributes wa;
 41
 42	wins = NULL;
 43	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 44		for(i = 0; i < num; i++) {
 45			if(!XGetWindowAttributes(dpy, wins[i], &wa))
 46				continue;
 47			if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 48				continue;
 49			if(wa.map_state == IsViewable)
 50				manage(wins[i], &wa);
 51		}
 52	}
 53	if(wins)
 54		XFree(wins);
 55}
 56
 57static int
 58win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
 59{
 60	int status, format;
 61	unsigned long res, extra;
 62	Atom real;
 63
 64	status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
 65			&res, &extra, prop);
 66
 67	if(status != Success || *prop == 0) {
 68		return 0;
 69	}
 70	if(res == 0) {
 71		free((void *) *prop);
 72	}
 73	return res;
 74}
 75
 76/*
 77 * Startup Error handler to check if another window manager
 78 * is already running.
 79 */
 80static int
 81xerrorstart(Display *dsply, XErrorEvent *ee)
 82{
 83	otherwm = True;
 84	return -1;
 85}
 86
 87/* extern */
 88
 89char stext[1024];
 90Bool *seltag;
 91int screen, sx, sy, sw, sh, bx, by, bw, bh, mw;
 92unsigned int ntags, numlockmask;
 93Atom wmatom[WMLast], netatom[NetLast];
 94Bool running = True;
 95Bool issel = True;
 96Client *clients = NULL;
 97Client *sel = NULL;
 98Cursor cursor[CurLast];
 99Display *dpy;
100DC dc = {0};
101Window root, barwin;
102
103int
104getproto(Window w)
105{
106	int protos = 0;
107	int i;
108	long res;
109	Atom *protocols;
110
111	res = win_property(w, wmatom[WMProtocols], XA_ATOM, 20L,
112			((unsigned char **)&protocols));
113	if(res <= 0) {
114		return protos;
115	}
116	for(i = 0; i < res; i++) {
117		if(protocols[i] == wmatom[WMDelete])
118			protos |= PROTODELWIN;
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	XSync(dpy, False);
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 those cases are
147 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
148 * default error handler, which calls exit().
149 */
150int
151xerror(Display *dpy, XErrorEvent *ee)
152{
153	if(ee->error_code == BadWindow
154	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
155	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
156	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
157	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
158	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
159	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess))
160		return 0;
161	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
162		ee->request_code, ee->error_code);
163	return xerrorxlib(dpy, ee); /* may call exit() */
164}
165
166int
167main(int argc, char *argv[])
168{
169	int i, j, xfd;
170	unsigned int mask;
171	fd_set rd;
172	Bool readin = True;
173	Window w;
174	XModifierKeymap *modmap;
175	XSetWindowAttributes wa;
176
177	if(argc == 2 && !strncmp("-v", argv[1], 3)) {
178		fputs("dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
179		exit(EXIT_SUCCESS);
180	}
181	else if(argc != 1)
182		eprint("usage: dwm [-v]\n");
183
184	dpy = XOpenDisplay(0);
185	if(!dpy)
186		eprint("dwm: cannot open display\n");
187
188	xfd = ConnectionNumber(dpy);
189	screen = DefaultScreen(dpy);
190	root = RootWindow(dpy, screen);
191
192	otherwm = False;
193	XSetErrorHandler(xerrorstart);
194	/* this causes an error if some other window manager is running */
195	XSelectInput(dpy, root, SubstructureRedirectMask);
196	XSync(dpy, False);
197
198	if(otherwm)
199		eprint("dwm: another window manager is already running\n");
200
201	XSync(dpy, False);
202	XSetErrorHandler(NULL);
203	xerrorxlib = XSetErrorHandler(xerror);
204	XSync(dpy, False);
205
206	/* init atoms */
207	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
208	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
209	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
210	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
211	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
212			PropModeReplace, (unsigned char *) netatom, NetLast);
213
214	/* init cursors */
215	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
216	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
217	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
218
219	modmap = XGetModifierMapping(dpy);
220	for (i = 0; i < 8; i++) {
221		for (j = 0; j < modmap->max_keypermod; j++) {
222			if(modmap->modifiermap[i * modmap->max_keypermod + j] == XKeysymToKeycode(dpy, XK_Num_Lock))
223				numlockmask = (1 << i);
224		}
225	}
226	XFree(modmap);
227
228	wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask | EnterWindowMask | LeaveWindowMask;
229	wa.cursor = cursor[CurNormal];
230	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
231
232	grabkeys();
233	initrregs();
234
235	for(ntags = 0; tags[ntags]; ntags++);
236	seltag = emallocz(sizeof(Bool) * ntags);
237	seltag[DEFTAG] = True;
238
239	/* style */
240	dc.bg = getcolor(BGCOLOR);
241	dc.fg = getcolor(FGCOLOR);
242	dc.border = getcolor(BORDERCOLOR);
243	setfont(FONT);
244
245	sx = sy = 0;
246	sw = DisplayWidth(dpy, screen);
247	sh = DisplayHeight(dpy, screen);
248	mw = (sw * MASTERW) / 100;
249
250	bx = by = 0;
251	bw = sw;
252	dc.h = bh = dc.font.height + 4;
253	wa.override_redirect = 1;
254	wa.background_pixmap = ParentRelative;
255	wa.event_mask = ButtonPressMask | ExposureMask;
256	barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
257			CopyFromParent, DefaultVisual(dpy, screen),
258			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
259	XDefineCursor(dpy, barwin, cursor[CurNormal]);
260	XMapRaised(dpy, barwin);
261
262	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
263	dc.gc = XCreateGC(dpy, root, 0, 0);
264
265	strcpy(stext, "dwm-"VERSION);
266	drawstatus();
267
268	issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
269
270	scan();
271
272	/* main event loop, also reads status text from stdin */
273	XSync(dpy, False);
274	procevent();
275	while(running) {
276		FD_ZERO(&rd);
277		if(readin)
278			FD_SET(STDIN_FILENO, &rd);
279		FD_SET(xfd, &rd);
280		i = select(xfd + 1, &rd, NULL, NULL, NULL);
281		if(i == -1 && errno == EINTR)
282			continue;
283		if(i < 0)
284			eprint("select failed\n");
285		else if(i > 0) {
286			if(readin && FD_ISSET(STDIN_FILENO, &rd)) {
287				readin = NULL != fgets(stext, sizeof(stext), stdin);
288				if(readin)
289					stext[strlen(stext) - 1] = 0;
290				else 
291					strcpy(stext, "broken pipe");
292				drawstatus();
293			}
294		}
295		procevent();
296	}
297	cleanup();
298	XCloseDisplay(dpy);
299
300	return 0;
301}