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 * © 2007 Premysl Hruby <dfenze at gmail dot com>
  4 * © 2007 Szabolcs Nagy <nszabolcs at gmail dot com>
  5 * See LICENSE file for license details. */
  6#include "dwm.h"
  7#include <errno.h>
  8#include <locale.h>
  9#include <stdio.h>
 10#include <stdlib.h>
 11#include <string.h>
 12#include <unistd.h>
 13#include <sys/select.h>
 14#include <X11/cursorfont.h>
 15#include <X11/keysym.h>
 16#include <X11/Xatom.h>
 17#include <X11/Xproto.h>
 18
 19/* extern */
 20
 21char stext[256];
 22int screen, sx, sy, sw, sh, wax, way, waw, wah;
 23unsigned int bh, bpos, ntags, numlockmask;
 24Atom wmatom[WMLast], netatom[NetLast];
 25Bool *seltag;
 26Bool selscreen = True;
 27Client *clients = NULL;
 28Client *sel = NULL;
 29Client *stack = NULL;
 30Cursor cursor[CurLast];
 31Display *dpy;
 32DC dc = {0};
 33Window root, barwin;
 34
 35/* static */
 36
 37static int (*xerrorxlib)(Display *, XErrorEvent *);
 38static Bool otherwm, readin;
 39static Bool running = True;
 40
 41static void
 42cleanup(void) {
 43	close(STDIN_FILENO);
 44	while(stack) {
 45		if(stack->isbanned)
 46			XMoveWindow(dpy, stack->win, stack->x, stack->y);
 47		unmanage(stack);
 48	}
 49	if(dc.font.set)
 50		XFreeFontSet(dpy, dc.font.set);
 51	else
 52		XFreeFont(dpy, dc.font.xfont);
 53	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 54	XFreePixmap(dpy, dc.drawable);
 55	XFreeGC(dpy, dc.gc);
 56	XDestroyWindow(dpy, barwin);
 57	XFreeCursor(dpy, cursor[CurNormal]);
 58	XFreeCursor(dpy, cursor[CurResize]);
 59	XFreeCursor(dpy, cursor[CurMove]);
 60	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 61	XSync(dpy, False);
 62	free(seltag);
 63}
 64
 65static unsigned long
 66initcolor(const char *colstr) {
 67	Colormap cmap = DefaultColormap(dpy, screen);
 68	XColor color;
 69
 70	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 71		eprint("error, cannot allocate color '%s'\n", colstr);
 72	return color.pixel;
 73}
 74
 75static void
 76initfont(const char *fontstr) {
 77	char *def, **missing;
 78	int i, n;
 79
 80	missing = NULL;
 81	if(dc.font.set)
 82		XFreeFontSet(dpy, dc.font.set);
 83	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 84	if(missing) {
 85		while(n--)
 86			fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 87		XFreeStringList(missing);
 88	}
 89	if(dc.font.set) {
 90		XFontSetExtents *font_extents;
 91		XFontStruct **xfonts;
 92		char **font_names;
 93		dc.font.ascent = dc.font.descent = 0;
 94		font_extents = XExtentsOfFontSet(dc.font.set);
 95		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 96		for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 97			if(dc.font.ascent < (*xfonts)->ascent)
 98				dc.font.ascent = (*xfonts)->ascent;
 99			if(dc.font.descent < (*xfonts)->descent)
100				dc.font.descent = (*xfonts)->descent;
101			xfonts++;
102		}
103	}
104	else {
105		if(dc.font.xfont)
106			XFreeFont(dpy, dc.font.xfont);
107		dc.font.xfont = NULL;
108		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
109			eprint("error, cannot load font: '%s'\n", fontstr);
110		dc.font.ascent = dc.font.xfont->ascent;
111		dc.font.descent = dc.font.xfont->descent;
112	}
113	dc.font.height = dc.font.ascent + dc.font.descent;
114}
115
116static void
117scan(void) {
118	unsigned int i, num;
119	Window *wins, d1, d2;
120	XWindowAttributes wa;
121
122	wins = NULL;
123	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
124		for(i = 0; i < num; i++) {
125			if(!XGetWindowAttributes(dpy, wins[i], &wa)
126			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
127				continue;
128			if(wa.map_state == IsViewable)
129				manage(wins[i], &wa);
130		}
131	}
132	if(wins)
133		XFree(wins);
134}
135
136static void
137setup(void) {
138	int i, j;
139	unsigned int mask;
140	Window w;
141	XModifierKeymap *modmap;
142	XSetWindowAttributes wa;
143
144	/* init atoms */
145	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
146	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
147	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
148	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
149	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
150	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
151			PropModeReplace, (unsigned char *) netatom, NetLast);
152	/* init cursors */
153	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
154	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
155	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
156	/* init modifier map */
157	numlockmask = 0;
158	modmap = XGetModifierMapping(dpy);
159	for (i = 0; i < 8; i++)
160		for (j = 0; j < modmap->max_keypermod; j++) {
161			if(modmap->modifiermap[i * modmap->max_keypermod + j]
162					== XKeysymToKeycode(dpy, XK_Num_Lock))
163				numlockmask = (1 << i);
164		}
165	XFreeModifiermap(modmap);
166	/* select for events */
167	wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
168		| EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
169	wa.cursor = cursor[CurNormal];
170	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
171	XSelectInput(dpy, root, wa.event_mask);
172	grabkeys();
173	compileregs();
174	for(ntags = 0; tags[ntags]; ntags++);
175	seltag = emallocz(sizeof(Bool) * ntags);
176	seltag[0] = True;
177	/* style */
178	dc.norm[ColBorder] = initcolor(NORMBORDERCOLOR);
179	dc.norm[ColBG] = initcolor(NORMBGCOLOR);
180	dc.norm[ColFG] = initcolor(NORMFGCOLOR);
181	dc.sel[ColBorder] = initcolor(SELBORDERCOLOR);
182	dc.sel[ColBG] = initcolor(SELBGCOLOR);
183	dc.sel[ColFG] = initcolor(SELFGCOLOR);
184	initfont(FONT);
185	/* geometry */
186	sx = sy = 0;
187	sw = DisplayWidth(dpy, screen);
188	sh = DisplayHeight(dpy, screen);
189	initlayouts();
190	/* bar */
191	dc.h = bh = dc.font.height + 2;
192	wa.override_redirect = 1;
193	wa.background_pixmap = ParentRelative;
194	wa.event_mask = ButtonPressMask | ExposureMask;
195	barwin = XCreateWindow(dpy, root, sx, sy, sw, bh, 0,
196			DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
197			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
198	XDefineCursor(dpy, barwin, cursor[CurNormal]);
199	bpos = BARPOS;
200	updatebarpos();
201	XMapRaised(dpy, barwin);
202	strcpy(stext, "dwm-"VERSION);
203	/* pixmap for everything */
204	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
205	dc.gc = XCreateGC(dpy, root, 0, 0);
206	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
207	if(!dc.font.set)
208		XSetFont(dpy, dc.gc, dc.font.xfont->fid);
209	/* multihead support */
210	selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
211}
212
213/*
214 * Startup Error handler to check if another window manager
215 * is already running.
216 */
217static int
218xerrorstart(Display *dsply, XErrorEvent *ee) {
219	otherwm = True;
220	return -1;
221}
222
223/* extern */
224
225void
226quit(const char *arg) {
227	readin = running = False;
228}
229
230void
231updatebarpos(void) {
232	XEvent ev;
233
234	wax = sx;
235	way = sy;
236	wah = sh;
237	waw = sw;
238	switch(bpos) {
239	default:
240		wah -= bh;
241		way += bh;
242		XMoveWindow(dpy, barwin, sx, sy);
243		break;
244	case BarBot:
245		wah -= bh;
246		XMoveWindow(dpy, barwin, sx, sy + wah);
247		break;
248	case BarOff:
249		XMoveWindow(dpy, barwin, sx, sy - bh);
250		break;
251	}
252	XSync(dpy, False);
253	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
254}
255
256/* There's no way to check accesses to destroyed windows, thus those cases are
257 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
258 * default error handler, which may call exit.
259 */
260int
261xerror(Display *dpy, XErrorEvent *ee) {
262	if(ee->error_code == BadWindow
263	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
264	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
265	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
266	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
267	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
268	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
269	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
270		return 0;
271	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
272		ee->request_code, ee->error_code);
273	return xerrorxlib(dpy, ee); /* may call exit */
274}
275
276int
277main(int argc, char *argv[]) {
278	char *p;
279	int r, xfd;
280	fd_set rd;
281	XEvent ev;
282
283	if(argc == 2 && !strcmp("-v", argv[1]))
284		eprint("dwm-"VERSION", © 2004-2007 Anselm R. Garbe, Sander van Dijk, Premysl Hruby, Szabolcs Nagy\n");
285	else if(argc != 1)
286		eprint("usage: dwm [-v]\n");
287	setlocale(LC_CTYPE, "");
288	if(!(dpy = XOpenDisplay(0)))
289		eprint("dwm: cannot open display\n");
290	xfd = ConnectionNumber(dpy);
291	screen = DefaultScreen(dpy);
292	root = RootWindow(dpy, screen);
293	otherwm = False;
294	XSetErrorHandler(xerrorstart);
295	/* this causes an error if some other window manager is running */
296	XSelectInput(dpy, root, SubstructureRedirectMask);
297	XSync(dpy, False);
298	if(otherwm)
299		eprint("dwm: another window manager is already running\n");
300
301	XSync(dpy, False);
302	XSetErrorHandler(NULL);
303	xerrorxlib = XSetErrorHandler(xerror);
304	XSync(dpy, False);
305	setup();
306	drawstatus();
307	scan();
308
309	/* main event loop, also reads status text from stdin */
310	XSync(dpy, False);
311	readin = True;
312	while(running) {
313		FD_ZERO(&rd);
314		if(readin)
315			FD_SET(STDIN_FILENO, &rd);
316		FD_SET(xfd, &rd);
317		if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
318			if(errno == EINTR)
319				continue;
320			eprint("select failed\n");
321		}
322		if(FD_ISSET(STDIN_FILENO, &rd)) {
323			switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
324			case -1:
325				strncpy(stext, strerror(errno), sizeof stext - 1);
326				stext[sizeof stext - 1] = '\0';
327				readin = False;
328				break;
329			case 0:
330				strncpy(stext, "EOF", 4);
331				readin = False;
332				break;
333			default:
334				for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
335				for(; p >= stext && *p != '\n'; --p);
336				if(p > stext)
337					strncpy(stext, p + 1, sizeof stext);
338			}
339			drawstatus();
340		}
341		while(XPending(dpy)) {
342			XNextEvent(dpy, &ev);
343			if(handler[ev.type])
344				(handler[ev.type])(&ev); /* call handler */
345		}
346	}
347	cleanup();
348	XCloseDisplay(dpy);
349	return 0;
350}