/* See LICENSE file for copyright and license details. */
#include <ctype.h>
#include <locale.h>
#include <stdbool.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 <X11/Xresource.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)
#define NUMBERSMAXDIGITS      100
#define NUMBERSBUFSIZE         (NUMBERSMAXDIGITS * 2) +1

/* define opaqueness */
#define OPAQUE 0xFFU

/* enums */
enum { SchemeNorm, SchemeSel, SchemeOut, SchemeLast }; /* color schemes */

struct item {
	char *text;
	struct item *left, *right;
	int out;
	int index;
};

static char numbers[NUMBERSBUFSIZE] = "";
static char text[BUFSIZ] = "";
static char *embed;
static int bh, mw, mh;
static int inputw = 0, promptw, passwd = 0;
static int lrpad; /* sum of left and right padding */
static int reject_no_match = 0;
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 int print_index = 0;
static bool sortmatches = true;

static Atom clip, utf8;
static Display *dpy;
static Window root, parentwin, win;
static XIC xic;

static Drw *drw;
static int usergb = 0;
static Visual *visual;
static int depth;
static Colormap cmap;
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 unsigned int
textw_clamp(const char *str, unsigned int n)
{
	unsigned int w = drw_fontset_getwidth_clamp(drw, str, n) + lrpad;
	return MIN(w, n);
}


static void
xinitvisual()
{
	XVisualInfo *infos;
	XRenderPictFormat *fmt;
	int nitems;
	int i;

	XVisualInfo tpl = {
		.screen = screen,
		.depth = 32,
		.class = TrueColor
	};

	long masks = VisualScreenMask | VisualDepthMask | VisualClassMask;

	infos = XGetVisualInfo(dpy, masks, &tpl, &nitems);
	visual = NULL;

	for (i = 0; i < nitems; i++){
		fmt = XRenderFindVisualFormat(dpy, infos[i].visual);
		if (fmt->type == PictTypeDirect && fmt->direct.alphaMask) {
			visual = infos[i].visual;
			depth = infos[i].depth;
			cmap = XCreateColormap(dpy, root, visual, AllocNone);
			usergb = 1;
			break;
		}
	}

	XFree(infos);

	if (! visual) {
		visual = DefaultVisual(dpy, screen);
		depth = DefaultDepth(dpy, screen);
		cmap = DefaultColormap(dpy, screen);
	}
}

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 * columns * bh;
	else
		n = mw - (promptw + inputw + TEXTW("<") + TEXTW(">") + TEXTW(numbers));
	/* 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 int
max_textw(void)
{
	int len = 0;
	for (struct item *item = items; item && item->text; item++)
		len = MAX(TEXTW(item->text), len);
	return len;
}

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
recalculatenumbers()
{
   unsigned int numer = 0, denom = 0;
   struct item *item;
   if (matchend) {
       numer++;
       for (item = matchend; item && item->left; item = item->left)
           numer++;
   }
   for (item = items; item && item->text; item++)
       denom++;
   snprintf(numbers, NUMBERSBUFSIZE, "%d/%d", numer, denom);
}


static void
drawmenu(void)
{
	unsigned int curpos;
	struct item *item;
	int x = 0, y = 0, fh = drw->fonts->h,  w;
 	char *censort;

	drw_setscheme(drw, scheme[SchemeNorm]);
	drw_rect(drw, 0, 0, mw, mh, 1, 1);

	if (prompt && *prompt) {
		if (colorprompt)
			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]);
	if (passwd) {
	        censort = ecalloc(1, sizeof(text));
		memset(censort, '.', strlen(text));
		drw_text(drw, x, 0, w, bh, lrpad / 2, censort, 0);
		free(censort);
	} else 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);
	}

	recalculatenumbers();
	if (lines > 0) {
		/* draw grid */
		int i = 0;
		for (item = curr; item != next; item = item->right, i++)
			drawitem(
				item,
				((i / lines) * ((mw -x) / columns)),
				y + (((i % lines) + 1) * bh),
				(mw - x) / columns
			);
	} 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(">") - TEXTW(numbers)));
		if (next) {
			w = TEXTW(">");
			drw_setscheme(drw, scheme[SchemeNorm]);
			drw_text(drw, mw - w - TEXTW(numbers), 0, w, bh, lrpad / 2, ">", 0);
		}
	}
	drw_setscheme(drw, scheme[SchemeNorm]);
	drw_text(drw, mw - TEXTW(numbers), 0, TEXTW(numbers), bh, lrpad / 2, numbers, 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");
}

static void
match(void)
{
	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;

	if (use_prefix) {
		matches = lprefix = matchend = prefixend = NULL;
		textsize = strlen(text);
	} else {
		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;
		if (!sortmatches)
			appenditem(item, &matches, &matchend);
		else {
			/* 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 if (!use_prefix)
				appenditem(item, &lsubstr, &substrend);
		}
	}
	if (lprefix) {
		if (matches) {
			matchend->right = lprefix;
			lprefix->left = matchend;
		} else
			matches = lprefix;
		matchend = prefixend;
	}
	if (!use_prefix && 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;

	static char last[BUFSIZ] = "";
	if(reject_no_match) {
		/* store last text value in case we need to revert it */
		memcpy(last, text, BUFSIZ);
	}

	/* 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();

	if(!matches && reject_no_match) {
		/* revert to last text value if theres no match */
		memcpy(text, last, BUFSIZ);
		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;
	struct item * item;
	KeySym ksym;
	Status status;
	int i, offscreen = 0;
	struct item *tmpsel;

	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 (columns > 1) {
			if (!sel)
				return;
			tmpsel = sel;
			for (i = 0; i < lines; i++) {
				if (!tmpsel->left || tmpsel->left->right != tmpsel) {
					if (offscreen)
						break;
					return;
				}
				if (tmpsel == curr)
					offscreen = 1;
				tmpsel = tmpsel->left;
			}
			sel = tmpsel;
			if (offscreen) {
				curr = prev;
				calcoffsets();
			}
			break;
		}
		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:
		if (print_index)
			printf("%d\n", (sel && !(ev->state & ShiftMask)) ? sel->index : -1);
		else
			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 (columns > 1) {
			if (!sel)
				return;
			tmpsel = sel;
			for (i = 0; i < lines; i++) {
				if (!tmpsel->right || tmpsel->right->left != tmpsel) {
					if (offscreen)
						break;
					return;
				}
				tmpsel = tmpsel->right;
				if (tmpsel == next)
					offscreen = 1;
			}
			sel = tmpsel;
			if (offscreen) {
				curr = next;
				calcoffsets();
			}
			break;
		}
		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 (!matches) break; /* cannot complete no matches */
		strncpy(text, matches->text, sizeof text - 1);
		text[sizeof text - 1] = '\0';
		len = cursor = strlen(text); /* length of longest common prefix */
		for (item = matches; item && item->text; item = item->right) {
			cursor = 0;
			while (cursor < len && text[cursor] == item->text[cursor])
				cursor++;
			len = cursor;
		}
		memset(text + len, '\0', strlen(text) - len);
		break;
	}

draw:
	drawmenu();
}

static void
buttonpress(XEvent *e)
{
	struct item *item;
	XButtonPressedEvent *ev = &e->xbutton;
	int x = 0, y = 0, h = bh, w, item_num = 0;

	if (ev->window != win)
		return;

	/* right-click: exit */
	if (ev->button == Button3)
		exit(1);

	if (prompt && *prompt)
		x += promptw;

	/* input field */
	w = (lines > 0 || !matches) ? mw - x : inputw;

	/* left-click on input: clear input,
	 * NOTE: if there is no left-arrow the space for < is reserved so
	 *       add that to the input width */
	if (ev->button == Button1 &&
	   ((lines <= 0 && ev->x >= 0 && ev->x <= x + w +
	   ((!prev || !curr->left) ? TEXTW("<") : 0)) ||
	   (lines > 0 && ev->y >= y && ev->y <= y + h))) {
		insert(NULL, -cursor);
		drawmenu();
		return;
	}
	/* middle-mouse click: paste selection */
	if (ev->button == Button2) {
		XConvertSelection(dpy, (ev->state & ShiftMask) ? clip : XA_PRIMARY,
		                  utf8, utf8, win, CurrentTime);
		drawmenu();
		return;
	}
	/* scroll up */
	if (ev->button == Button4 && prev) {
		sel = curr = prev;
		calcoffsets();
		drawmenu();
		return;
	}
	/* scroll down */
	if (ev->button == Button5 && next) {
		sel = curr = next;
		calcoffsets();
		drawmenu();
		return;
	}
	if (ev->button != Button1)
		return;
	if (ev->state & ~ControlMask)
		return;
	if (lines > 0) {
		/* vertical list: (ctrl)left-click on item */
		w = mw - x;
		for (item = curr; item != next; item = item->right) {
			if (item_num++ == lines) {
				item_num = 1;
				x += w / columns;
				y = 0;
			}
			y += h;
			if (ev->y >= y && ev->y <= (y + h)) {
				puts(item->text);
				if (!(ev->state & ControlMask))
					exit(0);
				sel = item;
				if (sel) {
					sel->out = 1;
					drawmenu();
				}
				return;
			}
		}
	} else if (matches) {
		/* left-click on left arrow */
		x += inputw;
		w = TEXTW("<");
		if (prev && curr->left) {
			if (ev->x >= x && ev->x <= x + w) {
				sel = curr = prev;
				calcoffsets();
				drawmenu();
				return;
			}
		}
		/* horizontal list: (ctrl)left-click on item */
		for (item = curr; item != next; item = item->right) {
			x += w;
			w = MIN(TEXTW(item->text), mw - x - TEXTW(">"));
			if (ev->x >= x && ev->x <= x + w) {
				puts(item->text);
				if (!(ev->state & ControlMask))
					exit(0);
				sel = item;
				if (sel) {
					sel->out = 1;
					drawmenu();
				}
				return;
			}
		}
		/* left-click on right arrow */
		w = TEXTW(">");
		x = mw - w;
		if (next && ev->x >= x && ev->x <= x + w) {
			sel = curr = next;
			calcoffsets();
			drawmenu();
			return;
		}
	}
}

static void
motionevent(XButtonEvent *ev)
{
	struct item *it;
	int xy, ev_xy;

	if (ev->window != win || matches == 0)
		return;

	xy = lines > 0 ? bh : inputw + promptw + TEXTW("<");
	ev_xy = lines > 0 ? ev->y : ev->x;
	for (it = curr; it && it != next; it = it->right) {
		int wh = lines > 0 ? bh : textw_clamp(it->text, mw - xy - TEXTW(">"));
		if (ev_xy >= xy && ev_xy < (xy + wh)) {
			sel = it;
			calcoffsets();
			drawmenu();
			break;
		}
		xy += wh;
	}
}

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;

  if(passwd){
    inputw = lines = 0;
    return;
  }

	/* 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;
		items[i].index = i;
		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;
	int i;

	while (!XNextEvent(dpy, &ev)) {
		if (preselected) {
			for (i = 0; i < preselected; i++) {
				if (sel && sel->right && (sel = sel->right) == next) {
					curr = next;
					calcoffsets();
				}
			}
			drawmenu();
			preselected = 0;
		}
		if (XFilterEvent(&ev, win))
			continue;
		switch(ev.type) {
		case MotionNotify:
			motionevent(&ev.xbutton);
			break;
		case DestroyNotify:
			if (ev.xdestroywindow.window != win)
				break;
			cleanup();
			exit(1);
		case ButtonPress:
			buttonpress(&ev);
			break;
		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], alphas[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;
	promptw = (prompt && *prompt) ? TEXTW(prompt) - lrpad / 4 : 0;
#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;

		if (centered) {
			mw = MIN(MAX(max_textw() + promptw, min_width), info[i].width);
			x = info[i].x_org + ((info[i].width  - mw) / 2);
			y = info[i].y_org + ((info[i].height - mh) / 2);
		} else {
			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);

		if (centered) {
			mw = MIN(MAX(max_textw() + promptw, min_width), wa.width);
			x = (wa.width - mw) / 2;
			y = (wa.height - mh) / 2;
		} else {
			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.border_pixel = 0;
	swa.colormap = cmap;
	swa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask |
		ButtonPressMask | PointerMotionMask;
	win = XCreateWindow(dpy, parentwin, x, y - (topbar ? 0: border_width * 2),
						mw - border_width * 2, mh, border_width,
	                    depth, InputOutput, visual,
	                    CWOverrideRedirect | CWBackPixel | CWColormap |  CWEventMask | CWBorderPixel, &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 [-bfiPrSvx] [-l lines] [-p prompt] [-fn font] [-m monitor]\n"
	      "             [-nb color] [-nf color] [-sb color] [-sf color] [-w windowid]\n"
	      "             [-n number] [-bw width] [-h height]\n", stderr);
	exit(1);
}

void
read_Xresources(void) {
	XrmInitialize();

	char* xrm;
	if ((xrm = XResourceManagerString(drw->dpy))) {
		char *type;
		XrmDatabase xdb = XrmGetStringDatabase(xrm);
		XrmValue xval;

		if (XrmGetResource(xdb, "dmenu.font", "*", &type, &xval) == True) /* font or font set */
			fonts[0] = strdup(xval.addr);
		if (XrmGetResource(xdb, "dmenu.color0", "*", &type, &xval) == True)  /* normal background color */
			colors[SchemeNorm][ColBg] = strdup(xval.addr);
		if (XrmGetResource(xdb, "dmenu.color4", "*", &type, &xval) == True)  /* normal foreground color */
			colors[SchemeNorm][ColFg] = strdup(xval.addr);
		if (XrmGetResource(xdb, "dmenu.color4", "*", &type, &xval) == True)  /* selected background color */
			colors[SchemeSel][ColBg] = strdup(xval.addr);
		if (XrmGetResource(xdb, "dmenu.color0", "*", &type, &xval) == True)  /* selected foreground color */
			colors[SchemeSel][ColFg] = strdup(xval.addr);

		XrmDestroyDatabase(xdb);
	}
}

int
main(int argc, char *argv[])
{
	XWindowAttributes wa;
	int i, fast = 0;

	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);
	xinitvisual();
	drw = drw_create(dpy, screen, root, wa.width, wa.height, visual, depth, cmap);
	read_Xresources();

	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], "-S"))   /* do not sort matches */
			sortmatches = false;
		else if (!strcmp(argv[i], "-c"))   /* centers dmenu on screen */
			centered = 1;
		else if (!strcmp(argv[i], "-i")) { /* case-insensitive item matching */
			fstrncmp = strncasecmp;
			fstrstr = cistrstr;
		} else if (!strcmp(argv[i], "-P")) /* is the input a password */
		        passwd = 1;
		else if (!strcmp(argv[i], "-ix"))  /* adds ability to return index in list */
			print_index = 1;
		else if (!strcmp(argv[i], "-r"))   /* reject input which results in no match */
			reject_no_match = 1;
		else if (!strcmp(argv[i], "-x"))   /* invert use_prefix */
			use_prefix = !use_prefix;
		else if (i + 1 == argc)
			usage();
		/* these options take one argument */
		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], "-g")) {   /* number of columns in grid */
			columns = atoi(argv[++i]);
			if (lines == 0) lines = 1;
		} else if (!strcmp(argv[i], "-l")) { /* number of lines in grid */
			lines = atoi(argv[++i]);
			if (columns == 0) columns = 1;
		} 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 if (!strcmp(argv[i], "-bw"))  /* border width */
			border_width = atoi(argv[++i]);
		else if (!strcmp(argv[i], "-n"))   /* preselected item */
			preselected = atoi(argv[++i]);
		else
			usage();

	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 */
}