text: /* See LICENSE file for copyright and license details. */
  #include <ctype.h>
  #include <locale.h>
  #include <math.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <strings.h>
  #include <time.h>
  #include <unistd.h>
  
  #include <X11/Xlib.h>
  #include <X11/Xatom.h>
  #include <X11/Xutil.h>
  #ifdef XINERAMA
  #include <X11/extensions/Xinerama.h>
  #endif
  #include <X11/Xft/Xft.h>
  
  #include "drw.h"
  #include "util.h"
  
  /* macros */
  #define INTERSECT(x,y,w,h,r)  (MAX(0, MIN((x)+(w),(r).x_org+(r).width)  - MAX((x),(r).x_org)) \
                               * MAX(0, MIN((y)+(h),(r).y_org+(r).height) - MAX((y),(r).y_org)))
  #define LENGTH(X)             (sizeof X / sizeof X[0])
  #define TEXTW(X)              (drw_fontset_getwidth(drw, (X)) + lrpad)
  
  /* enums */
  enum { SchemeNorm, SchemeSel, SchemeOut, SchemeLast }; /* color schemes */
  
  struct item {
  	char *text;
  	struct item *left, *right;
  	int out;
  	double distance;
  };
  
  static char text[BUFSIZ] = "";
  static char *embed;
  static int bh, mw, mh;
  static int inputw = 0, promptw;
  static int lrpad; /* sum of left and right padding */
  static size_t cursor;
  static struct item *items = NULL;
  static struct item *matches, *matchend;
  static struct item *prev, *curr, *next, *sel;
  static int mon = -1, screen;
  
  static Atom clip, utf8;
  static Display *dpy;
  static Window root, parentwin, win;
  static XIC xic;
  
  static Drw *drw;
  static Clr *scheme[SchemeLast];
  
  #include "config.h"
  
  static int (*fstrncmp)(const char *, const char *, size_t) = strncmp;
  static char *(*fstrstr)(const char *, const char *) = strstr;
  
  static void
  appenditem(struct item *item, struct item **list, struct item **last)
  {
  	if (*last)
  		(*last)->right = item;
  	else
  		*list = item;
  
  	item->left = *last;
  	item->right = NULL;
  	*last = item;
  }
  
  static void
  calcoffsets(void)
  {
  	int i, n;
  
  	if (lines > 0)
  		n = lines * bh;
  	else
  		n = mw - (promptw + inputw + TEXTW("<") + TEXTW(">"));
  	/* calculate which items will begin the next page and previous page */
  	for (i = 0, next = curr; next; next = next->right)
  		if ((i += (lines > 0) ? bh : MIN(TEXTW(next->text), n)) > n)
  			break;
  	for (i = 0, prev = curr; prev && prev->left; prev = prev->left)
  		if ((i += (lines > 0) ? bh : MIN(TEXTW(prev->left->text), n)) > n)
  			break;
  }
  
  static void
  cleanup(void)
  {
  	size_t i;
  
  	XUngrabKey(dpy, AnyKey, AnyModifier, root);
  	for (i = 0; i < SchemeLast; i++)
  		free(scheme[i]);
  	drw_free(drw);
  	XSync(dpy, False);
  	XCloseDisplay(dpy);
  }
  
  static char *
  cistrstr(const char *s, const char *sub)
  {
  	size_t len;
  
  	for (len = strlen(sub); *s; s++)
  		if (!strncasecmp(s, sub, len))
  			return (char *)s;
  	return NULL;
  }
  
  static int
  drawitem(struct item *item, int x, int y, int w)
  {
  	if (item == sel)
  		drw_setscheme(drw, scheme[SchemeSel]);
  	else if (item->out)
  		drw_setscheme(drw, scheme[SchemeOut]);
  	else
  		drw_setscheme(drw, scheme[SchemeNorm]);
  
  	return drw_text(drw, x, y, w, bh, lrpad / 2, item->text, 0);
  }
  
  static void
  drawmenu(void)
  {
  	unsigned int curpos;
  	struct item *item;
  	int x = 0, y = 0, fh = drw->fonts->h, w;
  
  	drw_setscheme(drw, scheme[SchemeNorm]);
  	drw_rect(drw, 0, 0, mw, mh, 1, 1);
  
  	if (prompt && *prompt) {
  		drw_setscheme(drw, scheme[SchemeSel]);
  		x = drw_text(drw, x, 0, promptw, bh, lrpad / 2, prompt, 0);
  	}
  	/* draw input field */
  	w = (lines > 0 || !matches) ? mw - x : inputw;
  	drw_setscheme(drw, scheme[SchemeNorm]);
  	drw_text(drw, x, 0, w, bh, lrpad / 2, text, 0);
  
  	curpos = TEXTW(text) - TEXTW(&text[cursor]);
  	if ((curpos += lrpad / 2 - 1) < w) {
  		drw_setscheme(drw, scheme[SchemeNorm]);
  		drw_rect(drw, x + curpos, 2 + (bh - fh) / 2, 2, fh - 4, 1, 0);
  	}
  
  	if (lines > 0) {
  		/* draw vertical list */
  		for (item = curr; item != next; item = item->right)
  			drawitem(item, x, y += bh, mw - x);
  	} else if (matches) {
  		/* draw horizontal list */
  		x += inputw;
  		w = TEXTW("<");
  		if (curr->left) {
  			drw_setscheme(drw, scheme[SchemeNorm]);
  			drw_text(drw, x, 0, w, bh, lrpad / 2, "<", 0);
  		}
  		x += w;
  		for (item = curr; item != next; item = item->right)
  			x = drawitem(item, x, 0, MIN(TEXTW(item->text), mw - x - TEXTW(">")));
  		if (next) {
  			w = TEXTW(">");
  			drw_setscheme(drw, scheme[SchemeNorm]);
  			drw_text(drw, mw - w, 0, w, bh, lrpad / 2, ">", 0);
  		}
  	}
  	drw_map(drw, win, 0, 0, mw, mh);
  }
  
  static void
  grabfocus(void)
  {
  	struct timespec ts = { .tv_sec = 0, .tv_nsec = 10000000  };
  	Window focuswin;
  	int i, revertwin;
  
  	for (i = 0; i < 100; ++i) {
  		XGetInputFocus(dpy, &focuswin, &revertwin);
  		if (focuswin == win)
  			return;
  		XSetInputFocus(dpy, win, RevertToParent, CurrentTime);
  		nanosleep(&ts, NULL);
  	}
  	die("cannot grab focus");
  }
  
  static void
  grabkeyboard(void)
  {
  	struct timespec ts = { .tv_sec = 0, .tv_nsec = 1000000  };
  	int i;
  
  	if (embed)
  		return;
  	/* try to grab keyboard, we may have to wait for another process to ungrab */
  	for (i = 0; i < 1000; i++) {
  		if (XGrabKeyboard(dpy, DefaultRootWindow(dpy), True, GrabModeAsync,
  		                  GrabModeAsync, CurrentTime) == GrabSuccess)
  			return;
  		nanosleep(&ts, NULL);
  	}
  	die("cannot grab keyboard");
  }
  
  int
  compare_distance(const void *a, const void *b)
  {
  	struct item *da = *(struct item **) a;
  	struct item *db = *(struct item **) b;
  
  	if (!db)
  		return 1;
  	if (!da)
  		return -1;
  
  	return da->distance == db->distance ? 0 : da->distance < db->distance ? -1 : 1;
  }
  
  void
  fuzzymatch(void)
  {
  	/* bang - we have so much memory */
  	struct item *it;
  	struct item **fuzzymatches = NULL;
  	char c;
  	int number_of_matches = 0, i, pidx, sidx, eidx;
  	int text_len = strlen(text), itext_len;
  
  	matches = matchend = NULL;
  
  	/* walk through all items */
  	for (it = items; it && it->text; it++) {
  		if (text_len) {
  			itext_len = strlen(it->text);
  			pidx = 0; /* pointer */
  			sidx = eidx = -1; /* start of match, end of match */
  			/* walk through item text */
  			for (i = 0; i < itext_len && (c = it->text[i]); i++) {
  				/* fuzzy match pattern */
  				if (!fstrncmp(&text[pidx], &c, 1)) {
  					if(sidx == -1)
  						sidx = i;
  					pidx++;
  					if (pidx == text_len) {
  						eidx = i;
  						break;
  					}
  				}
  			}
  			/* build list of matches */
  			if (eidx != -1) {
  				/* compute distance */
  				/* add penalty if match starts late (log(sidx+2))
  				 * add penalty for long a match without many matching characters */
  				it->distance = log(sidx + 2) + (double)(eidx - sidx - text_len);
  				/* fprintf(stderr, "distance %s %f\n", it->text, it->distance); */
  				appenditem(it, &matches, &matchend);
  				number_of_matches++;
  			}
  		} else {
  			appenditem(it, &matches, &matchend);
  		}
  	}
  
  	if (number_of_matches) {
  		/* initialize array with matches */
  		if (!(fuzzymatches = realloc(fuzzymatches, number_of_matches * sizeof(struct item*))))
  			die("cannot realloc %u bytes:", number_of_matches * sizeof(struct item*));
  		for (i = 0, it = matches; it && i < number_of_matches; i++, it = it->right) {
  			fuzzymatches[i] = it;
  		}
  		/* sort matches according to distance */
  		qsort(fuzzymatches, number_of_matches, sizeof(struct item*), compare_distance);
  		/* rebuild list of matches */
  		matches = matchend = NULL;
  		for (i = 0, it = fuzzymatches[i];  i < number_of_matches && it && \
  				it->text; i++, it = fuzzymatches[i]) {
  			appenditem(it, &matches, &matchend);
  		}
  		free(fuzzymatches);
  	}
  	curr = sel = matches;
  	calcoffsets();
  }
  
  static void
  match(void)
  {
  	if (fuzzy) {
  		fuzzymatch();
  		return;
  	}
  	static char **tokv = NULL;
  	static int tokn = 0;
  
  	char buf[sizeof text], *s;
  	int i, tokc = 0;
  	size_t len, textsize;
  	struct item *item, *lprefix, *lsubstr, *prefixend, *substrend;
  
  	strcpy(buf, text);
  	/* separate input text into tokens to be matched individually */
  	for (s = strtok(buf, " "); s; tokv[tokc - 1] = s, s = strtok(NULL, " "))
  		if (++tokc > tokn && !(tokv = realloc(tokv, ++tokn * sizeof *tokv)))
  			die("cannot realloc %u bytes:", tokn * sizeof *tokv);
  	len = tokc ? strlen(tokv[0]) : 0;
  
  	matches = lprefix = lsubstr = matchend = prefixend = substrend = NULL;
  	textsize = strlen(text) + 1;
  	for (item = items; item && item->text; item++) {
  		for (i = 0; i < tokc; i++)
  			if (!fstrstr(item->text, tokv[i]))
  				break;
  		if (i != tokc) /* not all tokens match */
  			continue;
  		/* exact matches go first, then prefixes, then substrings */
  		if (!tokc || !fstrncmp(text, item->text, textsize))
  			appenditem(item, &matches, &matchend);
  		else if (!fstrncmp(tokv[0], item->text, len))
  			appenditem(item, &lprefix, &prefixend);
  		else
  			appenditem(item, &lsubstr, &substrend);
  	}
  	if (lprefix) {
  		if (matches) {
  			matchend->right = lprefix;
  			lprefix->left = matchend;
  		} else
  			matches = lprefix;
  		matchend = prefixend;
  	}
  	if (lsubstr) {
  		if (matches) {
  			matchend->right = lsubstr;
  			lsubstr->left = matchend;
  		} else
  			matches = lsubstr;
  		matchend = substrend;
  	}
  	curr = sel = matches;
  	calcoffsets();
  }
  
  static void
  insert(const char *str, ssize_t n)
  {
  	if (strlen(text) + n > sizeof text - 1)
  		return;
  	/* move existing text out of the way, insert new text, and update cursor */
  	memmove(&text[cursor + n], &text[cursor], sizeof text - cursor - MAX(n, 0));
  	if (n > 0)
  		memcpy(&text[cursor], str, n);
  	cursor += n;
  	match();
  }
  
  static size_t
  nextrune(int inc)
  {
  	ssize_t n;
  
  	/* return location of next utf8 rune in the given direction (+1 or -1) */
  	for (n = cursor + inc; n + inc >= 0 && (text[n] & 0xc0) == 0x80; n += inc)
  		;
  	return n;
  }
  
  static void
  movewordedge(int dir)
  {
  	if (dir < 0) { /* move cursor to the start of the word*/
  		while (cursor > 0 && strchr(worddelimiters, text[nextrune(-1)]))
  			cursor = nextrune(-1);
  		while (cursor > 0 && !strchr(worddelimiters, text[nextrune(-1)]))
  			cursor = nextrune(-1);
  	} else { /* move cursor to the end of the word */
  		while (text[cursor] && strchr(worddelimiters, text[cursor]))
  			cursor = nextrune(+1);
  		while (text[cursor] && !strchr(worddelimiters, text[cursor]))
  			cursor = nextrune(+1);
  	}
  }
  
  static void
  keypress(XKeyEvent *ev)
  {
  	char buf[32];
  	int len;
  	KeySym ksym;
  	Status status;
  
  	len = XmbLookupString(xic, ev, buf, sizeof buf, &ksym, &status);
  	switch (status) {
  	default: /* XLookupNone, XBufferOverflow */
  		return;
  	case XLookupChars:
  		goto insert;
  	case XLookupKeySym:
  	case XLookupBoth:
  		break;
  	}
  
  	if (ev->state & ControlMask) {
  		switch(ksym) {
  		case XK_a: ksym = XK_Home;      break;
  		case XK_b: ksym = XK_Left;      break;
  		case XK_c: ksym = XK_Escape;    break;
  		case XK_d: ksym = XK_Delete;    break;
  		case XK_e: ksym = XK_End;       break;
  		case XK_f: ksym = XK_Right;     break;
  		case XK_g: ksym = XK_Escape;    break;
  		case XK_h: ksym = XK_BackSpace; break;
  		case XK_i: ksym = XK_Tab;       break;
  		case XK_j: /* fallthrough */
  		case XK_J: /* fallthrough */
  		case XK_m: /* fallthrough */
  		case XK_M: ksym = XK_Return; ev->state &= ~ControlMask; break;
  		case XK_n: ksym = XK_Down;      break;
  		case XK_p: ksym = XK_Up;        break;
  
  		case XK_k: /* delete right */
  			text[cursor] = '\0';
  			match();
  			break;
  		case XK_u: /* delete left */
  			insert(NULL, 0 - cursor);
  			break;
  		case XK_w: /* delete word */
  			while (cursor > 0 && strchr(worddelimiters, text[nextrune(-1)]))
  				insert(NULL, nextrune(-1) - cursor);
  			while (cursor > 0 && !strchr(worddelimiters, text[nextrune(-1)]))
  				insert(NULL, nextrune(-1) - cursor);
  			break;
  		case XK_y: /* paste selection */
  		case XK_Y:
  			XConvertSelection(dpy, (ev->state & ShiftMask) ? clip : XA_PRIMARY,
  			                  utf8, utf8, win, CurrentTime);
  			return;
  		case XK_Left:
  			movewordedge(-1);
  			goto draw;
  		case XK_Right:
  			movewordedge(+1);
  			goto draw;
  		case XK_Return:
  		case XK_KP_Enter:
  			break;
  		case XK_bracketleft:
  			cleanup();
  			exit(1);
  		default:
  			return;
  		}
  	} else if (ev->state & Mod1Mask) {
  		switch(ksym) {
  		case XK_b:
  			movewordedge(-1);
  			goto draw;
  		case XK_f:
  			movewordedge(+1);
  			goto draw;
  		case XK_g: ksym = XK_Home;  break;
  		case XK_G: ksym = XK_End;   break;
  		case XK_h: ksym = XK_Up;    break;
  		case XK_j: ksym = XK_Next;  break;
  		case XK_k: ksym = XK_Prior; break;
  		case XK_l: ksym = XK_Down;  break;
  		default:
  			return;
  		}
  	}
  
  	switch(ksym) {
  	default:
  insert:
  		if (!iscntrl(*buf))
  			insert(buf, len);
  		break;
  	case XK_Delete:
  		if (text[cursor] == '\0')
  			return;
  		cursor = nextrune(+1);
  		/* fallthrough */
  	case XK_BackSpace:
  		if (cursor == 0)
  			return;
  		insert(NULL, nextrune(-1) - cursor);
  		break;
  	case XK_End:
  		if (text[cursor] != '\0') {
  			cursor = strlen(text);
  			break;
  		}
  		if (next) {
  			/* jump to end of list and position items in reverse */
  			curr = matchend;
  			calcoffsets();
  			curr = prev;
  			calcoffsets();
  			while (next && (curr = curr->right))
  				calcoffsets();
  		}
  		sel = matchend;
  		break;
  	case XK_Escape:
  		cleanup();
  		exit(1);
  	case XK_Home:
  		if (sel == matches) {
  			cursor = 0;
  			break;
  		}
  		sel = curr = matches;
  		calcoffsets();
  		break;
  	case XK_Left:
  		if (cursor > 0 && (!sel || !sel->left || lines > 0)) {
  			cursor = nextrune(-1);
  			break;
  		}
  		if (lines > 0)
  			return;
  		/* fallthrough */
  	case XK_Up:
  		if (sel && sel->left && (sel = sel->left)->right == curr) {
  			curr = prev;
  			calcoffsets();
  		}
  		break;
  	case XK_Next:
  		if (!next)
  			return;
  		sel = curr = next;
  		calcoffsets();
  		break;
  	case XK_Prior:
  		if (!prev)
  			return;
  		sel = curr = prev;
  		calcoffsets();
  		break;
  	case XK_Return:
  	case XK_KP_Enter:
  		puts((sel && !(ev->state & ShiftMask)) ? sel->text : text);
  		if (!(ev->state & ControlMask)) {
  			cleanup();
  			exit(0);
  		}
  		if (sel)
  			sel->out = 1;
  		break;
  	case XK_Right:
  		if (text[cursor] != '\0') {
  			cursor = nextrune(+1);
  			break;
  		}
  		if (lines > 0)
  			return;
  		/* fallthrough */
  	case XK_Down:
  		if (sel && sel->right && (sel = sel->right) == next) {
  			curr = next;
  			calcoffsets();
  		}
  		break;
  	case XK_Tab:
  		if (!sel)
  			return;
  		strncpy(text, sel->text, sizeof text - 1);
  		text[sizeof text - 1] = '\0';
  		cursor = strlen(text);
  		match();
  		break;
  	}
  
  draw:
  	drawmenu();
  }
  
  static void
  paste(void)
  {
  	char *p, *q;
  	int di;
  	unsigned long dl;
  	Atom da;
  
  	/* we have been given the current selection, now insert it into input */
  	if (XGetWindowProperty(dpy, win, utf8, 0, (sizeof text / 4) + 1, False,
  	                   utf8, &da, &di, &dl, &dl, (unsigned char **)&p)
  	    == Success && p) {
  		insert(p, (q = strchr(p, '\n')) ? q - p : (ssize_t)strlen(p));
  		XFree(p);
  	}
  	drawmenu();
  }
  
  static void
  readstdin(void)
  {
  	char buf[sizeof text], *p;
  	size_t i, imax = 0, size = 0;
  	unsigned int tmpmax = 0;
  
  	/* read each line from stdin and add it to the item list */
  	for (i = 0; fgets(buf, sizeof buf, stdin); i++) {
  		if (i + 1 >= size / sizeof *items)
  			if (!(items = realloc(items, (size += BUFSIZ))))
  				die("cannot realloc %u bytes:", size);
  		if ((p = strchr(buf, '\n')))
  			*p = '\0';
  		if (!(items[i].text = strdup(buf)))
  			die("cannot strdup %u bytes:", strlen(buf) + 1);
  		items[i].out = 0;
  		drw_font_getexts(drw->fonts, buf, strlen(buf), &tmpmax, NULL);
  		if (tmpmax > inputw) {
  			inputw = tmpmax;
  			imax = i;
  		}
  	}
  	if (items)
  		items[i].text = NULL;
  	inputw = items ? TEXTW(items[imax].text) : 0;
  	lines = MIN(lines, i);
  }
  
  static void
  run(void)
  {
  	XEvent ev;
  
  	while (!XNextEvent(dpy, &ev)) {
  		if (XFilterEvent(&ev, win))
  			continue;
  		switch(ev.type) {
  		case DestroyNotify:
  			if (ev.xdestroywindow.window != win)
  				break;
  			cleanup();
  			exit(1);
  		case Expose:
  			if (ev.xexpose.count == 0)
  				drw_map(drw, win, 0, 0, mw, mh);
  			break;
  		case FocusIn:
  			/* regrab focus from parent window */
  			if (ev.xfocus.window != win)
  				grabfocus();
  			break;
  		case KeyPress:
  			keypress(&ev.xkey);
  			break;
  		case SelectionNotify:
  			if (ev.xselection.property == utf8)
  				paste();
  			break;
  		case VisibilityNotify:
  			if (ev.xvisibility.state != VisibilityUnobscured)
  				XRaiseWindow(dpy, win);
  			break;
  		}
  	}
  }
  
  static void
  setup(void)
  {
  	int x, y, i, j;
  	unsigned int du;
  	XSetWindowAttributes swa;
  	XIM xim;
  	Window w, dw, *dws;
  	XWindowAttributes wa;
  	XClassHint ch = {"dmenu", "dmenu"};
  #ifdef XINERAMA
  	XineramaScreenInfo *info;
  	Window pw;
  	int a, di, n, area = 0;
  #endif
  	/* init appearance */
  	for (j = 0; j < SchemeLast; j++)
  		scheme[j] = drw_scm_create(drw, colors[j], 2);
  
  	clip = XInternAtom(dpy, "CLIPBOARD",   False);
  	utf8 = XInternAtom(dpy, "UTF8_STRING", False);
  
  	/* calculate menu geometry */
  	bh = drw->fonts->h + 2;
  	bh = MAX(bh,lineheight);	/* make a menu line AT LEAST 'lineheight' tall */
  	lines = MAX(lines, 0);
  	mh = (lines + 1) * bh;
  #ifdef XINERAMA
  	i = 0;
  	if (parentwin == root && (info = XineramaQueryScreens(dpy, &n))) {
  		XGetInputFocus(dpy, &w, &di);
  		if (mon >= 0 && mon < n)
  			i = mon;
  		else if (w != root && w != PointerRoot && w != None) {
  			/* find top-level window containing current input focus */
  			do {
  				if (XQueryTree(dpy, (pw = w), &dw, &w, &dws, &du) && dws)
  					XFree(dws);
  			} while (w != root && w != pw);
  			/* find xinerama screen with which the window intersects most */
  			if (XGetWindowAttributes(dpy, pw, &wa))
  				for (j = 0; j < n; j++)
  					if ((a = INTERSECT(wa.x, wa.y, wa.width, wa.height, info[j])) > area) {
  						area = a;
  						i = j;
  					}
  		}
  		/* no focused window is on screen, so use pointer location instead */
  		if (mon < 0 && !area && XQueryPointer(dpy, root, &dw, &dw, &x, &y, &di, &di, &du))
  			for (i = 0; i < n; i++)
  				if (INTERSECT(x, y, 1, 1, info[i]))
  					break;
  
  		x = info[i].x_org;
  		y = info[i].y_org + (topbar ? 0 : info[i].height - mh);
  		mw = info[i].width;
  		XFree(info);
  	} else
  #endif
  	{
  		if (!XGetWindowAttributes(dpy, parentwin, &wa))
  			die("could not get embedding window attributes: 0x%lx",
  			    parentwin);
  		x = 0;
  		y = topbar ? 0 : wa.height - mh;
  		mw = wa.width;
  	}
  	promptw = (prompt && *prompt) ? TEXTW(prompt) - lrpad / 4 : 0;
  	inputw = MIN(inputw, mw/3);
  	match();
  
  	/* create menu window */
  	swa.override_redirect = True;
  	swa.background_pixel = scheme[SchemeNorm][ColBg].pixel;
  	swa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
  	win = XCreateWindow(dpy, parentwin, x, y, mw, mh, 0,
  	                    CopyFromParent, CopyFromParent, CopyFromParent,
  	                    CWOverrideRedirect | CWBackPixel | CWEventMask, &swa);
  	XSetClassHint(dpy, win, &ch);
  
  
  	/* input methods */
  	if ((xim = XOpenIM(dpy, NULL, NULL, NULL)) == NULL)
  		die("XOpenIM failed: could not open input device");
  
  	xic = XCreateIC(xim, XNInputStyle, XIMPreeditNothing | XIMStatusNothing,
  	                XNClientWindow, win, XNFocusWindow, win, NULL);
  
  	XMapRaised(dpy, win);
  	if (embed) {
  		XSelectInput(dpy, parentwin, FocusChangeMask | SubstructureNotifyMask);
  		if (XQueryTree(dpy, parentwin, &dw, &w, &dws, &du) && dws) {
  			for (i = 0; i < du && dws[i] != win; ++i)
  				XSelectInput(dpy, dws[i], FocusChangeMask);
  			XFree(dws);
  		}
  		grabfocus();
  	}
  	drw_resize(drw, mw, mh);
  	drawmenu();
  }
  
  static void
  usage(void)
  {
  	fputs("usage: dmenu [-bfiv] [-l lines] [-h height] [-p prompt] [-fn font] [-m monitor]\n"
  	      "             [-nb color] [-nf color] [-sb color] [-sf color] [-w windowid]\n", stderr);
  	exit(1);
  }
  
  int
  main(int argc, char *argv[])
  {
  	XWindowAttributes wa;
  	int i, fast = 0;
  
  	for (i = 1; i < argc; i++)
  		/* these options take no arguments */
  		if (!strcmp(argv[i], "-v")) {      /* prints version information */
  			puts("dmenu-"VERSION);
  			exit(0);
  		} else if (!strcmp(argv[i], "-b")) /* appears at the bottom of the screen */
  			topbar = 0;
  		else if (!strcmp(argv[i], "-f"))   /* grabs keyboard before reading stdin */
  			fast = 1;
  		else if (!strcmp(argv[i], "-F"))   /* grabs keyboard before reading stdin */
  			fuzzy = 0;
  		else if (!strcmp(argv[i], "-i")) { /* case-insensitive item matching */
  			fstrncmp = strncasecmp;
  			fstrstr = cistrstr;
  		} else if (i + 1 == argc)
  			usage();
  		/* these options take one argument */
  		else if (!strcmp(argv[i], "-l"))   /* number of lines in vertical list */
  			lines = atoi(argv[++i]);
  		else if (!strcmp(argv[i], "-h")) { /* minimum height of one menu line */
  			lineheight = atoi(argv[++i]);
  			lineheight = MAX(lineheight, min_lineheight);
  		}
  		else if (!strcmp(argv[i], "-m"))
  			mon = atoi(argv[++i]);
  		else if (!strcmp(argv[i], "-p"))   /* adds prompt to left of input field */
  			prompt = argv[++i];
  		else if (!strcmp(argv[i], "-fn"))  /* font or font set */
  			fonts[0] = argv[++i];
  		else if (!strcmp(argv[i], "-nb"))  /* normal background color */
  			colors[SchemeNorm][ColBg] = argv[++i];
  		else if (!strcmp(argv[i], "-nf"))  /* normal foreground color */
  			colors[SchemeNorm][ColFg] = argv[++i];
  		else if (!strcmp(argv[i], "-sb"))  /* selected background color */
  			colors[SchemeSel][ColBg] = argv[++i];
  		else if (!strcmp(argv[i], "-sf"))  /* selected foreground color */
  			colors[SchemeSel][ColFg] = argv[++i];
  		else if (!strcmp(argv[i], "-w"))   /* embedding window id */
  			embed = argv[++i];
  		else
  			usage();
  
  	if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
  		fputs("warning: no locale support\n", stderr);
  	if (!(dpy = XOpenDisplay(NULL)))
  		die("cannot open display");
  	screen = DefaultScreen(dpy);
  	root = RootWindow(dpy, screen);
  	if (!embed || !(parentwin = strtol(embed, NULL, 0)))
  		parentwin = root;
  	if (!XGetWindowAttributes(dpy, parentwin, &wa))
  		die("could not get embedding window attributes: 0x%lx",
  		    parentwin);
  	drw = drw_create(dpy, screen, root, wa.width, wa.height);
  	if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
  		die("no fonts could be loaded.");
  	lrpad = drw->fonts->h;
  
  #ifdef __OpenBSD__
  	if (pledge("stdio rpath", NULL) == -1)
  		die("pledge");
  #endif
  
  	if (fast && !isatty(0)) {
  		grabkeyboard();
  		readstdin();
  	} else {
  		readstdin();
  		grabkeyboard();
  	}
  	setup();
  	run();
  
  	return 1; /* unreachable */
  }
  