1/* See LICENSE file for copyright and license details. */
  2#include "dwm.h"
  3#include <errno.h>
  4#include <locale.h>
  5#include <stdio.h>
  6#include <stdlib.h>
  7#include <string.h>
  8#include <unistd.h>
  9#include <sys/select.h>
 10#include <X11/cursorfont.h>
 11#include <X11/keysym.h>
 12#include <X11/Xatom.h>
 13#include <X11/Xproto.h>
 14#include <X11/Xutil.h>
 15
 16/* extern */
 17
 18char stext[256];
 19int screen, sx, sy, sw, sh, wax, way, waw, wah;
 20unsigned int bh, ntags;
 21unsigned int bpos = BARPOS;
 22unsigned int numlockmask = 0;
 23Atom dwmconfig, wmatom[WMLast], netatom[NetLast];
 24Bool *seltag;
 25Bool selscreen = True;
 26Client *clients = NULL;
 27Client *sel = NULL;
 28Client *stack = NULL;
 29Cursor cursor[CurLast];
 30Display *dpy;
 31DC dc = {0};
 32Window root, barwin;
 33
 34/* static */
 35
 36static int (*xerrorxlib)(Display *, XErrorEvent *);
 37static Bool otherwm, readin;
 38static Bool running = True;
 39
 40static void
 41cleanup(void) {
 42	close(STDIN_FILENO);
 43	while(stack) {
 44		unban(stack);
 45		unmanage(stack, NormalState);
 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	dwmconfig = XInternAtom(dpy, "_DWM_CONFIG", False);
144	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
145	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
146	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
147	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
148	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
149	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
150			PropModeReplace, (unsigned char *) netatom, NetLast);
151	/* init cursors */
152	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
153	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
154	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
155	/* init modifier map */
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	updatebarpos();
198	XMapRaised(dpy, barwin);
199	strcpy(stext, "dwm-"VERSION);
200	/* pixmap for everything */
201	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
202	dc.gc = XCreateGC(dpy, root, 0, 0);
203	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
204	if(!dc.font.set)
205		XSetFont(dpy, dc.gc, dc.font.xfont->fid);
206	/* multihead support */
207	selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
208}
209
210/*
211 * Startup Error handler to check if another window manager
212 * is already running.
213 */
214static int
215xerrorstart(Display *dsply, XErrorEvent *ee) {
216	otherwm = True;
217	return -1;
218}
219
220/* extern */
221
222void
223quit(const char *arg) {
224	readin = running = False;
225}
226
227void
228updatebarpos(void) {
229	XEvent ev;
230
231	wax = sx;
232	way = sy;
233	wah = sh;
234	waw = sw;
235	switch(bpos) {
236	default:
237		wah -= bh;
238		way += bh;
239		XMoveWindow(dpy, barwin, sx, sy);
240		break;
241	case BarBot:
242		wah -= bh;
243		XMoveWindow(dpy, barwin, sx, sy + wah);
244		break;
245	case BarOff:
246		XMoveWindow(dpy, barwin, sx, sy - bh);
247		break;
248	}
249	XSync(dpy, False);
250	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
251}
252
253/* There's no way to check accesses to destroyed windows, thus those cases are
254 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
255 * default error handler, which may call exit.
256 */
257int
258xerror(Display *dpy, XErrorEvent *ee) {
259	if(ee->error_code == BadWindow
260	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
261	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
262	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
263	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
264	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
265	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
266	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
267		return 0;
268	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
269		ee->request_code, ee->error_code);
270	return xerrorxlib(dpy, ee); /* may call exit */
271}
272
273int
274main(int argc, char *argv[]) {
275	char *p;
276	int r, xfd;
277	fd_set rd;
278	XEvent ev;
279
280	if(argc == 2 && !strcmp("-v", argv[1]))
281		eprint("dwm-"VERSION", © 2006-2007 A. R. Garbe, S. van Dijk, J. Salmi, P. Hruby, S. Nagy\n");
282	else if(argc != 1)
283		eprint("usage: dwm [-v]\n");
284	setlocale(LC_CTYPE, "");
285	if(!(dpy = XOpenDisplay(0)))
286		eprint("dwm: cannot open display\n");
287	xfd = ConnectionNumber(dpy);
288	screen = DefaultScreen(dpy);
289	root = RootWindow(dpy, screen);
290	otherwm = False;
291	XSetErrorHandler(xerrorstart);
292	/* this causes an error if some other window manager is running */
293	XSelectInput(dpy, root, SubstructureRedirectMask);
294	XSync(dpy, False);
295	if(otherwm)
296		eprint("dwm: another window manager is already running\n");
297
298	XSync(dpy, False);
299	XSetErrorHandler(NULL);
300	xerrorxlib = XSetErrorHandler(xerror);
301	XSync(dpy, False);
302	setup();
303	drawstatus();
304	scan();
305
306	/* main event loop, also reads status text from stdin */
307	XSync(dpy, False);
308	readin = True;
309	while(running) {
310		FD_ZERO(&rd);
311		if(readin)
312			FD_SET(STDIN_FILENO, &rd);
313		FD_SET(xfd, &rd);
314		if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
315			if(errno == EINTR)
316				continue;
317			eprint("select failed\n");
318		}
319		if(FD_ISSET(STDIN_FILENO, &rd)) {
320			switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
321			case -1:
322				strncpy(stext, strerror(errno), sizeof stext - 1);
323				stext[sizeof stext - 1] = '\0';
324				readin = False;
325				break;
326			case 0:
327				strncpy(stext, "EOF", 4);
328				readin = False;
329				break;
330			default:
331				for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
332				for(; p >= stext && *p != '\n'; --p);
333				if(p > stext)
334					strncpy(stext, p + 1, sizeof stext);
335			}
336			drawstatus();
337		}
338		while(XPending(dpy)) {
339			XNextEvent(dpy, &ev);
340			if(handler[ev.type])
341				(handler[ev.type])(&ev); /* call handler */
342		}
343	}
344	cleanup();
345	XCloseDisplay(dpy);
346	return 0;
347}