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 * © 2006-2007 Jukka Salmi <jukka at salmi dot ch>
  4 * © 2007 Premysl Hruby <dfenze at gmail dot com>
  5 * © 2007 Szabolcs Nagy <nszabolcs at gmail dot com>
  6 * See LICENSE file for license details. */
  7#include "dwm.h"
  8#include <errno.h>
  9#include <locale.h>
 10#include <stdio.h>
 11#include <stdlib.h>
 12#include <string.h>
 13#include <unistd.h>
 14#include <sys/select.h>
 15#include <X11/cursorfont.h>
 16#include <X11/keysym.h>
 17#include <X11/Xatom.h>
 18#include <X11/Xproto.h>
 19
 20/* extern */
 21
 22char stext[256];
 23int screen, sx, sy, sw, sh, wax, way, waw, wah;
 24unsigned int bh, bpos, ntags, numlockmask;
 25Atom wmatom[WMLast], netatom[NetLast];
 26Bool *seltag;
 27Bool selscreen = True;
 28Client *clients = NULL;
 29Client *sel = NULL;
 30Client *stack = NULL;
 31Cursor cursor[CurLast];
 32Display *dpy;
 33DC dc = {0};
 34Window root, barwin;
 35
 36/* static */
 37
 38static int (*xerrorxlib)(Display *, XErrorEvent *);
 39static Bool otherwm, readin;
 40static Bool running = True;
 41
 42static void
 43cleanup(void) {
 44	close(STDIN_FILENO);
 45	while(stack) {
 46		if(stack->isbanned)
 47			XMoveWindow(dpy, stack->win, stack->x, stack->y);
 48		unmanage(stack);
 49	}
 50	if(dc.font.set)
 51		XFreeFontSet(dpy, dc.font.set);
 52	else
 53		XFreeFont(dpy, dc.font.xfont);
 54	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 55	XFreePixmap(dpy, dc.drawable);
 56	XFreeGC(dpy, dc.gc);
 57	XDestroyWindow(dpy, barwin);
 58	XFreeCursor(dpy, cursor[CurNormal]);
 59	XFreeCursor(dpy, cursor[CurResize]);
 60	XFreeCursor(dpy, cursor[CurMove]);
 61	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 62	XSync(dpy, False);
 63	free(seltag);
 64}
 65
 66static unsigned long
 67initcolor(const char *colstr) {
 68	Colormap cmap = DefaultColormap(dpy, screen);
 69	XColor color;
 70
 71	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 72		eprint("error, cannot allocate color '%s'\n", colstr);
 73	return color.pixel;
 74}
 75
 76static void
 77initfont(const char *fontstr) {
 78	char *def, **missing;
 79	int i, n;
 80
 81	missing = NULL;
 82	if(dc.font.set)
 83		XFreeFontSet(dpy, dc.font.set);
 84	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 85	if(missing) {
 86		while(n--)
 87			fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 88		XFreeStringList(missing);
 89	}
 90	if(dc.font.set) {
 91		XFontSetExtents *font_extents;
 92		XFontStruct **xfonts;
 93		char **font_names;
 94		dc.font.ascent = dc.font.descent = 0;
 95		font_extents = XExtentsOfFontSet(dc.font.set);
 96		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 97		for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 98			if(dc.font.ascent < (*xfonts)->ascent)
 99				dc.font.ascent = (*xfonts)->ascent;
100			if(dc.font.descent < (*xfonts)->descent)
101				dc.font.descent = (*xfonts)->descent;
102			xfonts++;
103		}
104	}
105	else {
106		if(dc.font.xfont)
107			XFreeFont(dpy, dc.font.xfont);
108		dc.font.xfont = NULL;
109		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
110			eprint("error, cannot load font: '%s'\n", fontstr);
111		dc.font.ascent = dc.font.xfont->ascent;
112		dc.font.descent = dc.font.xfont->descent;
113	}
114	dc.font.height = dc.font.ascent + dc.font.descent;
115}
116
117static void
118scan(void) {
119	unsigned int i, num;
120	Window *wins, d1, d2;
121	XWindowAttributes wa;
122
123	wins = NULL;
124	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
125		for(i = 0; i < num; i++) {
126			if(!XGetWindowAttributes(dpy, wins[i], &wa)
127			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
128				continue;
129			if(wa.map_state == IsViewable)
130				manage(wins[i], &wa);
131		}
132	}
133	if(wins)
134		XFree(wins);
135}
136
137static void
138setup(void) {
139	int i, j;
140	unsigned int mask;
141	Window w;
142	XModifierKeymap *modmap;
143	XSetWindowAttributes wa;
144
145	/* init atoms */
146	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
147	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
148	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
149	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
150	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
151	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
152			PropModeReplace, (unsigned char *) netatom, NetLast);
153	/* init cursors */
154	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
155	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
156	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
157	/* init modifier map */
158	numlockmask = 0;
159	modmap = XGetModifierMapping(dpy);
160	for (i = 0; i < 8; i++)
161		for (j = 0; j < modmap->max_keypermod; j++) {
162			if(modmap->modifiermap[i * modmap->max_keypermod + j]
163					== XKeysymToKeycode(dpy, XK_Num_Lock))
164				numlockmask = (1 << i);
165		}
166	XFreeModifiermap(modmap);
167	/* select for events */
168	wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
169		| EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
170	wa.cursor = cursor[CurNormal];
171	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
172	XSelectInput(dpy, root, wa.event_mask);
173	grabkeys();
174	compileregs();
175	for(ntags = 0; tags[ntags]; ntags++);
176	seltag = emallocz(sizeof(Bool) * ntags);
177	seltag[0] = True;
178	/* style */
179	dc.norm[ColBorder] = initcolor(NORMBORDERCOLOR);
180	dc.norm[ColBG] = initcolor(NORMBGCOLOR);
181	dc.norm[ColFG] = initcolor(NORMFGCOLOR);
182	dc.sel[ColBorder] = initcolor(SELBORDERCOLOR);
183	dc.sel[ColBG] = initcolor(SELBGCOLOR);
184	dc.sel[ColFG] = initcolor(SELFGCOLOR);
185	initfont(FONT);
186	/* geometry */
187	sx = sy = 0;
188	sw = DisplayWidth(dpy, screen);
189	sh = DisplayHeight(dpy, screen);
190	initlayouts();
191	/* bar */
192	dc.h = bh = dc.font.height + 2;
193	wa.override_redirect = 1;
194	wa.background_pixmap = ParentRelative;
195	wa.event_mask = ButtonPressMask | ExposureMask;
196	barwin = XCreateWindow(dpy, root, sx, sy, sw, bh, 0,
197			DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
198			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
199	XDefineCursor(dpy, barwin, cursor[CurNormal]);
200	bpos = BARPOS;
201	updatebarpos();
202	XMapRaised(dpy, barwin);
203	strcpy(stext, "dwm-"VERSION);
204	/* pixmap for everything */
205	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
206	dc.gc = XCreateGC(dpy, root, 0, 0);
207	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
208	if(!dc.font.set)
209		XSetFont(dpy, dc.gc, dc.font.xfont->fid);
210	/* multihead support */
211	selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
212}
213
214/*
215 * Startup Error handler to check if another window manager
216 * is already running.
217 */
218static int
219xerrorstart(Display *dsply, XErrorEvent *ee) {
220	otherwm = True;
221	return -1;
222}
223
224/* extern */
225
226void
227quit(const char *arg) {
228	readin = running = False;
229}
230
231void
232updatebarpos(void) {
233	XEvent ev;
234
235	wax = sx;
236	way = sy;
237	wah = sh;
238	waw = sw;
239	switch(bpos) {
240	default:
241		wah -= bh;
242		way += bh;
243		XMoveWindow(dpy, barwin, sx, sy);
244		break;
245	case BarBot:
246		wah -= bh;
247		XMoveWindow(dpy, barwin, sx, sy + wah);
248		break;
249	case BarOff:
250		XMoveWindow(dpy, barwin, sx, sy - bh);
251		break;
252	}
253	XSync(dpy, False);
254	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
255}
256
257/* There's no way to check accesses to destroyed windows, thus those cases are
258 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
259 * default error handler, which may call exit.
260 */
261int
262xerror(Display *dpy, XErrorEvent *ee) {
263	if(ee->error_code == BadWindow
264	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
265	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
266	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
267	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
268	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
269	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
270	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
271		return 0;
272	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
273		ee->request_code, ee->error_code);
274	return xerrorxlib(dpy, ee); /* may call exit */
275}
276
277int
278main(int argc, char *argv[]) {
279	char *p;
280	int r, xfd;
281	fd_set rd;
282	XEvent ev;
283
284	if(argc == 2 && !strcmp("-v", argv[1]))
285		eprint("dwm-"VERSION", © 2006-2007 A. R. Garbe, S. van Dijk, J. Salmi, P. Hruby, S. Nagy\n");
286	else if(argc != 1)
287		eprint("usage: dwm [-v]\n");
288	setlocale(LC_CTYPE, "");
289	if(!(dpy = XOpenDisplay(0)))
290		eprint("dwm: cannot open display\n");
291	xfd = ConnectionNumber(dpy);
292	screen = DefaultScreen(dpy);
293	root = RootWindow(dpy, screen);
294	otherwm = False;
295	XSetErrorHandler(xerrorstart);
296	/* this causes an error if some other window manager is running */
297	XSelectInput(dpy, root, SubstructureRedirectMask);
298	XSync(dpy, False);
299	if(otherwm)
300		eprint("dwm: another window manager is already running\n");
301
302	XSync(dpy, False);
303	XSetErrorHandler(NULL);
304	xerrorxlib = XSetErrorHandler(xerror);
305	XSync(dpy, False);
306	setup();
307	drawstatus();
308	scan();
309
310	/* main event loop, also reads status text from stdin */
311	XSync(dpy, False);
312	readin = True;
313	while(running) {
314		FD_ZERO(&rd);
315		if(readin)
316			FD_SET(STDIN_FILENO, &rd);
317		FD_SET(xfd, &rd);
318		if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
319			if(errno == EINTR)
320				continue;
321			eprint("select failed\n");
322		}
323		if(FD_ISSET(STDIN_FILENO, &rd)) {
324			switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
325			case -1:
326				strncpy(stext, strerror(errno), sizeof stext - 1);
327				stext[sizeof stext - 1] = '\0';
328				readin = False;
329				break;
330			case 0:
331				strncpy(stext, "EOF", 4);
332				readin = False;
333				break;
334			default:
335				for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
336				for(; p >= stext && *p != '\n'; --p);
337				if(p > stext)
338					strncpy(stext, p + 1, sizeof stext);
339			}
340			drawstatus();
341		}
342		while(XPending(dpy)) {
343			XNextEvent(dpy, &ev);
344			if(handler[ev.type])
345				(handler[ev.type])(&ev); /* call handler */
346		}
347	}
348	cleanup();
349	XCloseDisplay(dpy);
350	return 0;
351}