1/* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
  2 * See LICENSE file for license details.
  3 */
  4
  5#include "dwm.h"
  6#include <errno.h>
  7#include <locale.h>
  8#include <stdio.h>
  9#include <stdlib.h>
 10#include <string.h>
 11#include <unistd.h>
 12#include <sys/select.h>
 13#include <X11/cursorfont.h>
 14#include <X11/keysym.h>
 15#include <X11/Xatom.h>
 16#include <X11/Xproto.h>
 17
 18/* extern */
 19
 20char stext[256];
 21int screen, sx, sy, sw, sh, wax, way, waw, wah;
 22unsigned int bh, ntags, numlockmask;
 23Atom 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		if(stack->isbanned)
 45			XMoveWindow(dpy, stack->win, stack->x, stack->y);
 46		unmanage(stack);
 47	}
 48	if(dc.font.set)
 49		XFreeFontSet(dpy, dc.font.set);
 50	else
 51		XFreeFont(dpy, dc.font.xfont);
 52	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 53	XFreePixmap(dpy, dc.drawable);
 54	XFreeGC(dpy, dc.gc);
 55	XDestroyWindow(dpy, barwin);
 56	XFreeCursor(dpy, cursor[CurNormal]);
 57	XFreeCursor(dpy, cursor[CurResize]);
 58	XFreeCursor(dpy, cursor[CurMove]);
 59	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 60	XSync(dpy, False);
 61	free(seltag);
 62}
 63
 64static unsigned long
 65initcolor(const char *colstr) {
 66	Colormap cmap = DefaultColormap(dpy, screen);
 67	XColor color;
 68
 69	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 70		eprint("error, cannot allocate color '%s'\n", colstr);
 71	return color.pixel;
 72}
 73
 74static void
 75initfont(const char *fontstr) {
 76	char *def, **missing;
 77	int i, n;
 78
 79	missing = NULL;
 80	if(dc.font.set)
 81		XFreeFontSet(dpy, dc.font.set);
 82	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 83	if(missing) {
 84		while(n--)
 85			fprintf(stderr, "missing fontset: %s\n", missing[n]);
 86		XFreeStringList(missing);
 87	}
 88	if(dc.font.set) {
 89		XFontSetExtents *font_extents;
 90		XFontStruct **xfonts;
 91		char **font_names;
 92		dc.font.ascent = dc.font.descent = 0;
 93		font_extents = XExtentsOfFontSet(dc.font.set);
 94		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 95		for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 96			if(dc.font.ascent < (*xfonts)->ascent)
 97				dc.font.ascent = (*xfonts)->ascent;
 98			if(dc.font.descent < (*xfonts)->descent)
 99				dc.font.descent = (*xfonts)->descent;
100			xfonts++;
101		}
102	}
103	else {
104		if(dc.font.xfont)
105			XFreeFont(dpy, dc.font.xfont);
106		dc.font.xfont = NULL;
107		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
108			eprint("error, cannot load font: '%s'\n", fontstr);
109		dc.font.ascent = dc.font.xfont->ascent;
110		dc.font.descent = dc.font.xfont->descent;
111	}
112	dc.font.height = dc.font.ascent + dc.font.descent;
113}
114
115static void
116scan(void) {
117	unsigned int i, num;
118	Window *wins, d1, d2;
119	XWindowAttributes wa;
120
121	wins = NULL;
122	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
123		for(i = 0; i < num; i++) {
124			if(!XGetWindowAttributes(dpy, wins[i], &wa)
125			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
126				continue;
127			if(wa.map_state == IsViewable)
128				manage(wins[i], &wa);
129		}
130	}
131	if(wins)
132		XFree(wins);
133}
134
135static void
136setup(void) {
137	int i, j;
138	unsigned int mask;
139	Window w;
140	XModifierKeymap *modmap;
141	XSetWindowAttributes wa;
142
143	/* init atoms */
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	numlockmask = 0;
157	modmap = XGetModifierMapping(dpy);
158	for (i = 0; i < 8; i++)
159		for (j = 0; j < modmap->max_keypermod; j++) {
160			if(modmap->modifiermap[i * modmap->max_keypermod + j]
161					== XKeysymToKeycode(dpy, XK_Num_Lock))
162				numlockmask = (1 << i);
163		}
164	XFreeModifiermap(modmap);
165	/* select for events */
166	wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
167		| EnterWindowMask | LeaveWindowMask;
168	wa.cursor = cursor[CurNormal];
169	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
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 + (TOPBAR ? 0 : sh - bh), sw, bh, 0,
194			DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
195			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
196	XDefineCursor(dpy, barwin, cursor[CurNormal]);
197	XMapRaised(dpy, barwin);
198	strcpy(stext, "dwm-"VERSION);
199	/* windowarea */
200	wax = sx;
201	way = sy + (TOPBAR ? bh : 0);
202	wah = sh - bh;
203	waw = sw;
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	/* 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", (C)opyright MMVI-MMVII 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}