1/* © 2006-2007 Anselm R. Garbe <garbeam at gmail dot com>
  2 * © 2006-2007 Sander van Dijk <a dot h dot vandijk at gmail dot com>
  3 * See LICENSE file for license details. */
  4#include "dwm.h"
  5#include <errno.h>
  6#include <locale.h>
  7#include <stdio.h>
  8#include <stdlib.h>
  9#include <string.h>
 10#include <unistd.h>
 11#include <sys/select.h>
 12#include <X11/cursorfont.h>
 13#include <X11/keysym.h>
 14#include <X11/Xatom.h>
 15#include <X11/Xproto.h>
 16
 17/* extern */
 18
 19char stext[256];
 20int screen, sx, sy, sw, sh, wax, way, waw, wah;
 21unsigned int bh, bpos, ntags, numlockmask;
 22Atom wmatom[WMLast], netatom[NetLast];
 23Bool *seltag;
 24Bool selscreen = True;
 25Client *clients = NULL;
 26Client *sel = NULL;
 27Client *stack = NULL;
 28Cursor cursor[CurLast];
 29Display *dpy;
 30DC dc = {0};
 31Window root, barwin;
 32
 33/* static */
 34
 35static int (*xerrorxlib)(Display *, XErrorEvent *);
 36static Bool otherwm, readin;
 37static Bool running = True;
 38
 39static void
 40cleanup(void) {
 41	close(STDIN_FILENO);
 42	while(stack) {
 43		if(stack->isbanned)
 44			XMoveWindow(dpy, stack->win, stack->x, stack->y);
 45		unmanage(stack);
 46	}
 47	if(dc.font.set)
 48		XFreeFontSet(dpy, dc.font.set);
 49	else
 50		XFreeFont(dpy, dc.font.xfont);
 51	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 52	XFreePixmap(dpy, dc.drawable);
 53	XFreeGC(dpy, dc.gc);
 54	XDestroyWindow(dpy, barwin);
 55	XFreeCursor(dpy, cursor[CurNormal]);
 56	XFreeCursor(dpy, cursor[CurResize]);
 57	XFreeCursor(dpy, cursor[CurMove]);
 58	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 59	XSync(dpy, False);
 60	free(seltag);
 61}
 62
 63static unsigned long
 64initcolor(const char *colstr) {
 65	Colormap cmap = DefaultColormap(dpy, screen);
 66	XColor color;
 67
 68	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 69		eprint("error, cannot allocate color '%s'\n", colstr);
 70	return color.pixel;
 71}
 72
 73static void
 74initfont(const char *fontstr) {
 75	char *def, **missing;
 76	int i, n;
 77
 78	missing = NULL;
 79	if(dc.font.set)
 80		XFreeFontSet(dpy, dc.font.set);
 81	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 82	if(missing) {
 83		while(n--)
 84			fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 85		XFreeStringList(missing);
 86	}
 87	if(dc.font.set) {
 88		XFontSetExtents *font_extents;
 89		XFontStruct **xfonts;
 90		char **font_names;
 91		dc.font.ascent = dc.font.descent = 0;
 92		font_extents = XExtentsOfFontSet(dc.font.set);
 93		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 94		for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 95			if(dc.font.ascent < (*xfonts)->ascent)
 96				dc.font.ascent = (*xfonts)->ascent;
 97			if(dc.font.descent < (*xfonts)->descent)
 98				dc.font.descent = (*xfonts)->descent;
 99			xfonts++;
100		}
101	}
102	else {
103		if(dc.font.xfont)
104			XFreeFont(dpy, dc.font.xfont);
105		dc.font.xfont = NULL;
106		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
107			eprint("error, cannot load font: '%s'\n", fontstr);
108		dc.font.ascent = dc.font.xfont->ascent;
109		dc.font.descent = dc.font.xfont->descent;
110	}
111	dc.font.height = dc.font.ascent + dc.font.descent;
112}
113
114static void
115scan(void) {
116	unsigned int i, num;
117	Window *wins, d1, d2;
118	XWindowAttributes wa;
119
120	wins = NULL;
121	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
122		for(i = 0; i < num; i++) {
123			if(!XGetWindowAttributes(dpy, wins[i], &wa)
124			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
125				continue;
126			if(wa.map_state == IsViewable)
127				manage(wins[i], &wa);
128		}
129	}
130	if(wins)
131		XFree(wins);
132}
133
134static void
135setup(void) {
136	int i, j;
137	unsigned int mask;
138	Window w;
139	XModifierKeymap *modmap;
140	XSetWindowAttributes wa;
141
142	/* init atoms */
143	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
144	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
145	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
146	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
147	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
148	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
149			PropModeReplace, (unsigned char *) netatom, NetLast);
150	/* init cursors */
151	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
152	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
153	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
154	/* init modifier map */
155	numlockmask = 0;
156	modmap = XGetModifierMapping(dpy);
157	for (i = 0; i < 8; i++)
158		for (j = 0; j < modmap->max_keypermod; j++) {
159			if(modmap->modifiermap[i * modmap->max_keypermod + j]
160					== XKeysymToKeycode(dpy, XK_Num_Lock))
161				numlockmask = (1 << i);
162		}
163	XFreeModifiermap(modmap);
164	/* select for events */
165	wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
166		| EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
167	wa.cursor = cursor[CurNormal];
168	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
169	XSelectInput(dpy, root, wa.event_mask);
170	grabkeys();
171	compileregs();
172	for(ntags = 0; tags[ntags]; ntags++);
173	seltag = emallocz(sizeof(Bool) * ntags);
174	seltag[0] = True;
175	/* style */
176	dc.norm[ColBorder] = initcolor(NORMBORDERCOLOR);
177	dc.norm[ColBG] = initcolor(NORMBGCOLOR);
178	dc.norm[ColFG] = initcolor(NORMFGCOLOR);
179	dc.sel[ColBorder] = initcolor(SELBORDERCOLOR);
180	dc.sel[ColBG] = initcolor(SELBGCOLOR);
181	dc.sel[ColFG] = initcolor(SELFGCOLOR);
182	initfont(FONT);
183	/* geometry */
184	sx = sy = 0;
185	sw = DisplayWidth(dpy, screen);
186	sh = DisplayHeight(dpy, screen);
187	initlayouts();
188	/* bar */
189	dc.h = bh = dc.font.height + 2;
190	wa.override_redirect = 1;
191	wa.background_pixmap = ParentRelative;
192	wa.event_mask = ButtonPressMask | ExposureMask;
193	barwin = XCreateWindow(dpy, root, sx, sy, sw, bh, 0,
194			DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
195			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
196	XDefineCursor(dpy, barwin, cursor[CurNormal]);
197	bpos = BARPOS;
198	updatebarpos();
199	XMapRaised(dpy, barwin);
200	strcpy(stext, "dwm-"VERSION);
201	/* pixmap for everything */
202	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
203	dc.gc = XCreateGC(dpy, root, 0, 0);
204	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
205	if(!dc.font.set)
206		XSetFont(dpy, dc.gc, dc.font.xfont->fid);
207	/* multihead support */
208	selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
209}
210
211/*
212 * Startup Error handler to check if another window manager
213 * is already running.
214 */
215static int
216xerrorstart(Display *dsply, XErrorEvent *ee) {
217	otherwm = True;
218	return -1;
219}
220
221/* extern */
222
223void
224quit(const char *arg) {
225	readin = running = False;
226}
227
228void
229updatebarpos(void) {
230	wax = sx;
231	way = sy;
232	wah = sh;
233	waw = sw;
234	switch(bpos) {
235	default:
236		wah -= bh;
237		way += bh;
238		XMoveWindow(dpy, barwin, sx, sy);
239		break;
240	case BarBot:
241		wah -= bh;
242		XMoveWindow(dpy, barwin, sx, sy + wah);
243		break;
244	case BarOff:
245		XMoveWindow(dpy, barwin, sx, sy - bh);
246		break;
247	}
248}
249
250/* There's no way to check accesses to destroyed windows, thus those cases are
251 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
252 * default error handler, which may call exit.
253 */
254int
255xerror(Display *dpy, XErrorEvent *ee) {
256	if(ee->error_code == BadWindow
257	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
258	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
259	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
260	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
261	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
262	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
263	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
264		return 0;
265	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
266		ee->request_code, ee->error_code);
267	return xerrorxlib(dpy, ee); /* may call exit */
268}
269
270int
271main(int argc, char *argv[]) {
272	char *p;
273	int r, xfd;
274	fd_set rd;
275	XEvent ev;
276
277	if(argc == 2 && !strncmp("-v", argv[1], 3))
278		eprint("dwm-"VERSION", © 2004-2007 Anselm R. Garbe, Sander van Dijk\n");
279	else if(argc != 1)
280		eprint("usage: dwm [-v]\n");
281	setlocale(LC_CTYPE, "");
282	if(!(dpy = XOpenDisplay(0)))
283		eprint("dwm: cannot open display\n");
284	xfd = ConnectionNumber(dpy);
285	screen = DefaultScreen(dpy);
286	root = RootWindow(dpy, screen);
287	otherwm = False;
288	XSetErrorHandler(xerrorstart);
289	/* this causes an error if some other window manager is running */
290	XSelectInput(dpy, root, SubstructureRedirectMask);
291	XSync(dpy, False);
292	if(otherwm)
293		eprint("dwm: another window manager is already running\n");
294
295	XSync(dpy, False);
296	XSetErrorHandler(NULL);
297	xerrorxlib = XSetErrorHandler(xerror);
298	XSync(dpy, False);
299	setup();
300	drawstatus();
301	scan();
302
303	/* main event loop, also reads status text from stdin */
304	XSync(dpy, False);
305	readin = True;
306	while(running) {
307		FD_ZERO(&rd);
308		if(readin)
309			FD_SET(STDIN_FILENO, &rd);
310		FD_SET(xfd, &rd);
311		if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
312			if(errno == EINTR)
313				continue;
314			eprint("select failed\n");
315		}
316		if(FD_ISSET(STDIN_FILENO, &rd)) {
317			switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
318			case -1:
319				strncpy(stext, strerror(errno), sizeof stext - 1);
320				stext[sizeof stext - 1] = '\0';
321				readin = False;
322				break;
323			case 0:
324				strncpy(stext, "EOF", 4);
325				readin = False;
326				break;
327			default:
328				for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
329				for(; p >= stext && *p != '\n'; --p);
330				if(p > stext)
331					strncpy(stext, p + 1, sizeof stext);
332			}
333			drawstatus();
334		}
335		while(XPending(dpy)) {
336			XNextEvent(dpy, &ev);
337			if(handler[ev.type])
338				(handler[ev.type])(&ev); /* call handler */
339		}
340	}
341	cleanup();
342	XCloseDisplay(dpy);
343	return 0;
344}