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