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When mode-mouse is on (it is off by default), automatically enter copy
mode when the mouse is dragged or the mouse wheel is used. Also exit
copy mode when the mouse wheel is scrolled off the bottom. Discussed
with and written by hsim at gmx dot li.

/* $OpenBSD: window-copy.c,v 1.68 2011/04/19 21:31:33 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <stdlib.h>
#include <string.h>

#include "tmux.h"

struct screen *window_copy_init(struct window_pane *);
void	window_copy_free(struct window_pane *);
void	window_copy_resize(struct window_pane *, u_int, u_int);
void	window_copy_key(struct window_pane *, struct session *, int);
int	window_copy_key_input(struct window_pane *, int);
int	window_copy_key_numeric_prefix(struct window_pane *, int);
void	window_copy_mouse(
	    struct window_pane *, struct session *, struct mouse_event *);

void	window_copy_redraw_lines(struct window_pane *, u_int, u_int);
void	window_copy_redraw_screen(struct window_pane *);
void	window_copy_write_line(
	    struct window_pane *, struct screen_write_ctx *, u_int);
void	window_copy_write_lines(
	    struct window_pane *, struct screen_write_ctx *, u_int, u_int);

void	window_copy_scroll_to(struct window_pane *, u_int, u_int);
int	window_copy_search_compare(
	    struct grid *, u_int, u_int, struct grid *, u_int);
int	window_copy_search_lr(
	    struct grid *, struct grid *, u_int *, u_int, u_int, u_int);
int	window_copy_search_rl(
	    struct grid *, struct grid *, u_int *, u_int, u_int, u_int);
void	window_copy_search_up(struct window_pane *, const char *);
void	window_copy_search_down(struct window_pane *, const char *);
void	window_copy_goto_line(struct window_pane *, const char *);
void	window_copy_update_cursor(struct window_pane *, u_int, u_int);
void	window_copy_start_selection(struct window_pane *);
int	window_copy_update_selection(struct window_pane *);
void	window_copy_copy_selection(struct window_pane *);
void	window_copy_clear_selection(struct window_pane *);
void	window_copy_copy_line(
	    struct window_pane *, char **, size_t *, u_int, u_int, u_int);
int	window_copy_in_set(struct window_pane *, u_int, u_int, const char *);
u_int	window_copy_find_length(struct window_pane *, u_int);
void	window_copy_cursor_start_of_line(struct window_pane *);
void	window_copy_cursor_back_to_indentation(struct window_pane *);
void	window_copy_cursor_end_of_line(struct window_pane *);
void	window_copy_cursor_left(struct window_pane *);
void	window_copy_cursor_right(struct window_pane *);
void	window_copy_cursor_up(struct window_pane *, int);
void	window_copy_cursor_down(struct window_pane *, int);
void	window_copy_cursor_jump(struct window_pane *);
void	window_copy_cursor_jump_back(struct window_pane *);
void	window_copy_cursor_next_word(struct window_pane *, const char *);
void	window_copy_cursor_next_word_end(struct window_pane *, const char *);
void	window_copy_cursor_previous_word(struct window_pane *, const char *);
void	window_copy_scroll_up(struct window_pane *, u_int);
void	window_copy_scroll_down(struct window_pane *, u_int);
void	window_copy_rectangle_toggle(struct window_pane *);

const struct window_mode window_copy_mode = {
	window_copy_init,
	window_copy_free,
	window_copy_resize,
	window_copy_key,
	window_copy_mouse,
	NULL,
};

enum window_copy_input_type {
	WINDOW_COPY_OFF,
	WINDOW_COPY_NUMERICPREFIX,
	WINDOW_COPY_SEARCHUP,
	WINDOW_COPY_SEARCHDOWN,
	WINDOW_COPY_JUMPFORWARD,
	WINDOW_COPY_JUMPBACK,
	WINDOW_COPY_GOTOLINE,
};

/*
 * Copy-mode's visible screen (the "screen" field) is filled from one of
 * two sources: the original contents of the pane (used when we
 * actually enter via the "copy-mode" command, to copy the contents of
 * the current pane), or else a series of lines containing the output
 * from an output-writing tmux command (such as any of the "show-*" or
 * "list-*" commands).
 *
 * In either case, the full content of the copy-mode grid is pointed at
 * by the "backing" field, and is copied into "screen" as needed (that
 * is, when scrolling occurs). When copy-mode is backed by a pane,
 * backing points directly at that pane's screen structure (&wp->base);
 * when backed by a list of output-lines from a command, it points at
 * a newly-allocated screen structure (which is deallocated when the
 * mode ends).
 */
struct window_copy_mode_data {
	struct screen	screen;

	struct screen  *backing;
	int		backing_written; /* backing display has started */

	struct mode_key_data mdata;

	u_int		oy;

	u_int		selx;
	u_int		sely;

	u_int		rectflag; /* are we in rectangle copy mode? */

	u_int		cx;
	u_int		cy;

	u_int		lastcx; /* position in last line with content */
	u_int		lastsx; /* size of last line with content */

	enum window_copy_input_type inputtype;
	const char     *inputprompt;
	char   	       *inputstr;

	u_int		numprefix;

	enum window_copy_input_type searchtype;
	char	       *searchstr;

	enum window_copy_input_type jumptype;
	char		jumpchar;
};

struct screen *
window_copy_init(struct window_pane *wp)
{
	struct window_copy_mode_data	*data;
	struct screen			*s;
	int				 keys;

	wp->modedata = data = xmalloc(sizeof *data);
	data->oy = 0;
	data->cx = 0;
	data->cy = 0;

	data->lastcx = 0;
	data->lastsx = 0;

	data->backing_written = 0;

	data->rectflag = 0;

	data->inputtype = WINDOW_COPY_OFF;
	data->inputprompt = NULL;
	data->inputstr = xstrdup("");
	data->numprefix = 0;

	data->searchtype = WINDOW_COPY_OFF;
	data->searchstr = NULL;

	wp->flags |= PANE_FREEZE;
	if (wp->fd != -1)
		bufferevent_disable(wp->event, EV_READ|EV_WRITE);

	data->jumptype = WINDOW_COPY_OFF;
	data->jumpchar = '\0';

	s = &data->screen;
	screen_init(s, screen_size_x(&wp->base), screen_size_y(&wp->base), 0);
	if (options_get_number(&wp->window->options, "mode-mouse"))
		s->mode |= MODE_MOUSE_STANDARD;

	keys = options_get_number(&wp->window->options, "mode-keys");
	if (keys == MODEKEY_EMACS)
		mode_key_init(&data->mdata, &mode_key_tree_emacs_copy);
	else
		mode_key_init(&data->mdata, &mode_key_tree_vi_copy);

	data->backing = NULL;

	return (s);
}

void
window_copy_init_from_pane(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	struct screen_write_ctx	 	 ctx;
	u_int				 i;

	if (wp->mode != &window_copy_mode)
		fatalx("not in copy mode");

	data->backing = &wp->base;
	data->cx = data->backing->cx;
	data->cy = data->backing->cy;

	s->cx = data->cx;
	s->cy = data->cy;

	screen_write_start(&ctx, NULL, s);
	for (i = 0; i < screen_size_y(s); i++)
		window_copy_write_line(wp, &ctx, i);
	screen_write_cursormove(&ctx, data->cx, data->cy);
	screen_write_stop(&ctx);
}

void
window_copy_init_for_output(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;

	data->backing = xmalloc(sizeof *data->backing);
	screen_init(data->backing, screen_size_x(&wp->base),
	    screen_size_y(&wp->base), UINT_MAX);
	data->backing->mode &= ~MODE_WRAP;
}

void
window_copy_free(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;

	wp->flags &= ~PANE_FREEZE;
	if (wp->fd != -1)
		bufferevent_enable(wp->event, EV_READ|EV_WRITE);

	if (data->searchstr != NULL)
		xfree(data->searchstr);
	xfree(data->inputstr);

	if (data->backing != &wp->base) {
		screen_free(data->backing);
		xfree(data->backing);
	}
	screen_free(&data->screen);

	xfree(data);
}

void
window_copy_add(struct window_pane *wp, const char *fmt, ...)
{
	va_list	ap;

	va_start(ap, fmt);
	window_copy_vadd(wp, fmt, ap);
	va_end(ap);
}

void
window_copy_vadd(struct window_pane *wp, const char *fmt, va_list ap)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*backing = data->backing;
	struct screen_write_ctx	 	 back_ctx, ctx;
	struct grid_cell		 gc;
	int				 utf8flag;
	u_int				 old_hsize;

	if (backing == &wp->base)
		return;

	utf8flag = options_get_number(&wp->window->options, "utf8");
	memcpy(&gc, &grid_default_cell, sizeof gc);

	old_hsize = screen_hsize(data->backing);
	screen_write_start(&back_ctx, NULL, backing);
	if (data->backing_written) {
		/*
		 * On the second or later line, do a CRLF before writing
		 * (so it's on a new line).
		 */
		screen_write_carriagereturn(&back_ctx);
		screen_write_linefeed(&back_ctx, 0);
	} else
		data->backing_written = 1;
	screen_write_vnputs(&back_ctx, 0, &gc, utf8flag, fmt, ap);
	screen_write_stop(&back_ctx);

	data->oy += screen_hsize(data->backing) - old_hsize;

	screen_write_start(&ctx, wp, &data->screen);

	/*
	 * If the history has changed, draw the top line.
	 * (If there's any history at all, it has changed.)
	 */
	if (screen_hsize(data->backing))
		window_copy_redraw_lines(wp, 0, 1);

	/* Write the line, if it's visible. */
	if (backing->cy + data->oy < screen_size_y(backing))
		window_copy_redraw_lines(wp, backing->cy, 1);

	screen_write_stop(&ctx);
}

void
window_copy_pageup(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	u_int				 n;

	n = 1;
	if (screen_size_y(s) > 2)
		n = screen_size_y(s) - 2;
	if (data->oy + n > screen_hsize(data->backing))
		data->oy = screen_hsize(data->backing);
	else
		data->oy += n;
	window_copy_update_selection(wp);
	window_copy_redraw_screen(wp);
}

void
window_copy_resize(struct window_pane *wp, u_int sx, u_int sy)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	struct screen_write_ctx	 	 ctx;

	screen_resize(s, sx, sy);
	if (data->backing != &wp->base)
		screen_resize(data->backing, sx, sy);

	if (data->cy > sy - 1)
		data->cy = sy - 1;
	if (data->cx > sx)
		data->cx = sx;
	if (data->oy > screen_hsize(data->backing))
		data->oy = screen_hsize(data->backing);

	window_copy_clear_selection(wp);

	screen_write_start(&ctx, NULL, s);
	window_copy_write_lines(wp, &ctx, 0, screen_size_y(s) - 1);
	screen_write_stop(&ctx);

	window_copy_redraw_screen(wp);
}

void
window_copy_key(struct window_pane *wp, struct session *sess, int key)
{
	const char			*word_separators;
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	u_int				 n, np;
	int				 keys;
	enum mode_key_cmd		 cmd;

	np = data->numprefix;
	if (np == 0)
		np = 1;

	if (data->inputtype == WINDOW_COPY_JUMPFORWARD ||
	    data->inputtype == WINDOW_COPY_JUMPBACK) {
		/* Ignore keys with modifiers. */
		if ((key & KEYC_MASK_MOD) == 0) {
			data->jumpchar = key;
			if (data->inputtype == WINDOW_COPY_JUMPFORWARD) {
				for (; np != 0; np--)
					window_copy_cursor_jump(wp);
			}  else {
				for (; np != 0; np--)
					window_copy_cursor_jump_back(wp);
			}
		}
		data->jumptype = data->inputtype;
		data->inputtype = WINDOW_COPY_OFF;
		window_copy_redraw_lines(wp, screen_size_y(s) - 1, 1);
		return;
	} else if (data->inputtype == WINDOW_COPY_NUMERICPREFIX) {
		if (window_copy_key_numeric_prefix(wp, key) == 0)
			return;
		data->inputtype = WINDOW_COPY_OFF;
		window_copy_redraw_lines(wp, screen_size_y(s) - 1, 1);
	} else if (data->inputtype != WINDOW_COPY_OFF) {
		if (window_copy_key_input(wp, key) != 0)
			goto input_off;
		return;
	}

	cmd = mode_key_lookup(&data->mdata, key);
	switch (cmd) {
	case MODEKEYCOPY_CANCEL:
		window_pane_reset_mode(wp);
		return;
	case MODEKEYCOPY_LEFT:
		for (; np != 0; np--)
			window_copy_cursor_left(wp);
		break;
	case MODEKEYCOPY_RIGHT:
		for (; np != 0; np--)
			window_copy_cursor_right(wp);
		break;
	case MODEKEYCOPY_UP:
		for (; np != 0; np--)
			window_copy_cursor_up(wp, 0);
		break;
	case MODEKEYCOPY_DOWN:
		for (; np != 0; np--)
			window_copy_cursor_down(wp, 0);
		break;
	case MODEKEYCOPY_SCROLLUP:
		for (; np != 0; np--)
			window_copy_cursor_up(wp, 1);
		break;
	case MODEKEYCOPY_SCROLLDOWN:
		for (; np != 0; np--)
			window_copy_cursor_down(wp, 1);
		break;
	case MODEKEYCOPY_PREVIOUSPAGE:
		for (; np != 0; np--)
			window_copy_pageup(wp);
		break;
	case MODEKEYCOPY_NEXTPAGE:
		n = 1;
		if (screen_size_y(s) > 2)
			n = screen_size_y(s) - 2;
		for (; np != 0; np--) {
			if (data->oy < n)
				data->oy = 0;
			else
				data->oy -= n;
		}
		window_copy_update_selection(wp);
		window_copy_redraw_screen(wp);
		break;
	case MODEKEYCOPY_HALFPAGEUP:
		n = screen_size_y(s) / 2;
		for (; np != 0; np--) {
			if (data->oy + n > screen_hsize(data->backing))
				data->oy = screen_hsize(data->backing);
			else
				data->oy += n;
		}
		window_copy_update_selection(wp);
		window_copy_redraw_screen(wp);
		break;
	case MODEKEYCOPY_HALFPAGEDOWN:
		n = screen_size_y(s) / 2;
		for (; np != 0; np--) {
			if (data->oy < n)
				data->oy = 0;
			else
				data->oy -= n;
		}
		window_copy_update_selection(wp);
		window_copy_redraw_screen(wp);
		break;
	case MODEKEYCOPY_TOPLINE:
		data->cx = 0;
		data->cy = 0;
		window_copy_update_selection(wp);
		window_copy_redraw_screen(wp);
		break;
	case MODEKEYCOPY_MIDDLELINE:
		data->cx = 0;
		data->cy = (screen_size_y(s) - 1) / 2;
		window_copy_update_selection(wp);
		window_copy_redraw_screen(wp);
		break;
	case MODEKEYCOPY_BOTTOMLINE:
		data->cx = 0;
		data->cy = screen_size_y(s) - 1;
		window_copy_update_selection(wp);
		window_copy_redraw_screen(wp);
		break;
	case MODEKEYCOPY_HISTORYTOP:
		data->cx = 0;
		data->cy = 0;
		data->oy = screen_hsize(data->backing);
		window_copy_update_selection(wp);
		window_copy_redraw_screen(wp);
		break;
	case MODEKEYCOPY_HISTORYBOTTOM:
		data->cx = 0;
		data->cy = screen_size_y(s) - 1;
		data->oy = 0;
		window_copy_update_selection(wp);
		window_copy_redraw_screen(wp);
		break;
	case MODEKEYCOPY_STARTSELECTION:
		window_copy_start_selection(wp);
		window_copy_redraw_screen(wp);
		break;
	case MODEKEYCOPY_CLEARSELECTION:
		window_copy_clear_selection(wp);
		window_copy_redraw_screen(wp);
		break;
	case MODEKEYCOPY_COPYSELECTION:
		if (sess != NULL) {
			window_copy_copy_selection(wp);
			window_pane_reset_mode(wp);
			return;
		}
		break;
	case MODEKEYCOPY_STARTOFLINE:
		window_copy_cursor_start_of_line(wp);
		break;
	case MODEKEYCOPY_BACKTOINDENTATION:
		window_copy_cursor_back_to_indentation(wp);
		break;
	case MODEKEYCOPY_ENDOFLINE:
		window_copy_cursor_end_of_line(wp);
		break;
	case MODEKEYCOPY_NEXTSPACE:
		for (; np != 0; np--)
			window_copy_cursor_next_word(wp, " ");
		break;
	case MODEKEYCOPY_NEXTSPACEEND:
		for (; np != 0; np--)
			window_copy_cursor_next_word_end(wp, " ");
		break;
	case MODEKEYCOPY_NEXTWORD:
		word_separators =
		    options_get_string(&wp->window->options, "word-separators");
		for (; np != 0; np--)
			window_copy_cursor_next_word(wp, word_separators);
		break;
	case MODEKEYCOPY_NEXTWORDEND:
		word_separators =
		    options_get_string(&wp->window->options, "word-separators");
		for (; np != 0; np--)
			window_copy_cursor_next_word_end(wp, word_separators);
		break;
	case MODEKEYCOPY_PREVIOUSSPACE:
		for (; np != 0; np--)
			window_copy_cursor_previous_word(wp, " ");
		break;
	case MODEKEYCOPY_PREVIOUSWORD:
		word_separators =
		    options_get_string(&wp->window->options, "word-separators");
		for (; np != 0; np--)
			window_copy_cursor_previous_word(wp, word_separators);
		break;
	case MODEKEYCOPY_JUMP:
		data->inputtype = WINDOW_COPY_JUMPFORWARD;
		data->inputprompt = "Jump Forward";
		*data->inputstr = '\0';
		window_copy_redraw_lines(wp, screen_size_y(s) - 1, 1);
		return; /* skip numprefix reset */
	case MODEKEYCOPY_JUMPAGAIN:
		if (data->jumptype == WINDOW_COPY_JUMPFORWARD) {
			for (; np != 0; np--)
				window_copy_cursor_jump(wp);
		} else if (data->jumptype == WINDOW_COPY_JUMPBACK) {
			for (; np != 0; np--)
				window_copy_cursor_jump_back(wp);
		}
		break;
	case MODEKEYCOPY_JUMPREVERSE:
		if (data->jumptype == WINDOW_COPY_JUMPFORWARD) {
			for (; np != 0; np--)
				window_copy_cursor_jump_back(wp);
		} else if (data->jumptype == WINDOW_COPY_JUMPBACK) {
			for (; np != 0; np--)
				window_copy_cursor_jump(wp);
		}
		break;
	case MODEKEYCOPY_JUMPBACK:
		data->inputtype = WINDOW_COPY_JUMPBACK;
		data->inputprompt = "Jump Back";
		*data->inputstr = '\0';
		window_copy_redraw_lines(wp, screen_size_y(s) - 1, 1);
		return; /* skip numprefix reset */
	case MODEKEYCOPY_SEARCHUP:
		data->inputtype = WINDOW_COPY_SEARCHUP;
		data->inputprompt = "Search Up";
		goto input_on;
	case MODEKEYCOPY_SEARCHDOWN:
		data->inputtype = WINDOW_COPY_SEARCHDOWN;
		data->inputprompt = "Search Down";
		goto input_on;
	case MODEKEYCOPY_SEARCHAGAIN:
	case MODEKEYCOPY_SEARCHREVERSE:
		switch (data->searchtype) {
		case WINDOW_COPY_OFF:
		case WINDOW_COPY_GOTOLINE:
		case WINDOW_COPY_JUMPFORWARD:
		case WINDOW_COPY_JUMPBACK:
		case WINDOW_COPY_NUMERICPREFIX:
			break;
		case WINDOW_COPY_SEARCHUP:
			if (cmd == MODEKEYCOPY_SEARCHAGAIN) {
				for (; np != 0; np--) {
					window_copy_search_up(
					    wp, data->searchstr);
				}
			} else {
				for (; np != 0; np--) {
					window_copy_search_down(
					    wp, data->searchstr);
				}
			}
			break;
		case WINDOW_COPY_SEARCHDOWN:
			if (cmd == MODEKEYCOPY_SEARCHAGAIN) {
				for (; np != 0; np--) {
					window_copy_search_down(
					    wp, data->searchstr);
				}
			} else {
				for (; np != 0; np--) {
					window_copy_search_up(
					    wp, data->searchstr);
				}
			}
			break;
		}
		break;
	case MODEKEYCOPY_GOTOLINE:
		data->inputtype = WINDOW_COPY_GOTOLINE;
		data->inputprompt = "Goto Line";
		*data->inputstr = '\0';
		goto input_on;
	case MODEKEYCOPY_STARTNUMBERPREFIX:
		key &= KEYC_MASK_KEY;
		if (key >= '0' && key <= '9') {
			data->inputtype = WINDOW_COPY_NUMERICPREFIX;
			data->numprefix = 0;
			window_copy_key_numeric_prefix(wp, key);
			return;
		}
		break;
	case MODEKEYCOPY_RECTANGLETOGGLE:
		window_copy_rectangle_toggle(wp);
		break;
	default:
		break;
	}

	data->numprefix = 0;
	return;

input_on:
	keys = options_get_number(&wp->window->options, "mode-keys");
	if (keys == MODEKEY_EMACS)
		mode_key_init(&data->mdata, &mode_key_tree_emacs_edit);
	else
		mode_key_init(&data->mdata, &mode_key_tree_vi_edit);

	window_copy_redraw_lines(wp, screen_size_y(s) - 1, 1);
	return;

input_off:
	keys = options_get_number(&wp->window->options, "mode-keys");
	if (keys == MODEKEY_EMACS)
		mode_key_init(&data->mdata, &mode_key_tree_emacs_copy);
	else
		mode_key_init(&data->mdata, &mode_key_tree_vi_copy);

	data->inputtype = WINDOW_COPY_OFF;
	data->inputprompt = NULL;

	window_copy_redraw_lines(wp, screen_size_y(s) - 1, 1);
}

int
window_copy_key_input(struct window_pane *wp, int key)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	size_t				 inputlen;
	u_int				 np;

	switch (mode_key_lookup(&data->mdata, key)) {
	case MODEKEYEDIT_CANCEL:
		data->numprefix = 0;
		return (-1);
	case MODEKEYEDIT_BACKSPACE:
		inputlen = strlen(data->inputstr);
		if (inputlen > 0)
			data->inputstr[inputlen - 1] = '\0';
		break;
	case MODEKEYEDIT_DELETELINE:
		*data->inputstr = '\0';
		break;
	case MODEKEYEDIT_ENTER:
		np = data->numprefix;
		if (np == 0)
			np = 1;

		switch (data->inputtype) {
		case WINDOW_COPY_OFF:
		case WINDOW_COPY_JUMPFORWARD:
		case WINDOW_COPY_JUMPBACK:
		case WINDOW_COPY_NUMERICPREFIX:
			break;
		case WINDOW_COPY_SEARCHUP:
			for (; np != 0; np--)
				window_copy_search_up(wp, data->inputstr);
			data->searchtype = data->inputtype;
			data->searchstr = xstrdup(data->inputstr);
			break;
		case WINDOW_COPY_SEARCHDOWN:
			for (; np != 0; np--)
				window_copy_search_down(wp, data->inputstr);
			data->searchtype = data->inputtype;
			data->searchstr = xstrdup(data->inputstr);
			break;
		case WINDOW_COPY_GOTOLINE:
			window_copy_goto_line(wp, data->inputstr);
			*data->inputstr = '\0';
			break;
		}
		data->numprefix = 0;
		return (1);
	case MODEKEY_OTHER:
		if (key < 32 || key > 126)
			break;
		inputlen = strlen(data->inputstr) + 2;

		data->inputstr = xrealloc(data->inputstr, 1, inputlen);
		data->inputstr[inputlen - 2] = key;
		data->inputstr[inputlen - 1] = '\0';
		break;
	default:
		break;
	}

	window_copy_redraw_lines(wp, screen_size_y(s) - 1, 1);
	return (0);
}

int
window_copy_key_numeric_prefix(struct window_pane *wp, int key)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;

	key &= KEYC_MASK_KEY;
	if (key < '0' || key > '9')
		return 1;

	if (data->numprefix >= 100)	/* no more than three digits */
		return 0;
	data->numprefix = data->numprefix * 10 + key - '0';

	window_copy_redraw_lines(wp, screen_size_y(s) - 1, 1);
	return 0;
}

/* ARGSUSED */
void
window_copy_mouse(
    struct window_pane *wp, struct session *sess, struct mouse_event *m)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	u_int				 i, old_cy;

	if (m->x >= screen_size_x(s))
		return;
	if (m->y >= screen_size_y(s))
		return;

	/* If mouse wheel (buttons 4 and 5), scroll. */
	if ((m->b & MOUSE_45)) {
		if ((m->b & MOUSE_BUTTON) == MOUSE_1) {
			for (i = 0; i < 5; i++)
				window_copy_cursor_up(wp, 0);
		} else if ((m->b & MOUSE_BUTTON) == MOUSE_2) {
			old_cy = data->cy;
			for (i = 0; i < 5; i++)
				window_copy_cursor_down(wp, 0);
			if (old_cy == data->cy)
				goto reset_mode;
		}
		return;
	}

	/*
	 * If already reading motion, move the cursor while buttons are still
	 * pressed, or stop the selection on their release.
	 */
	if (s->mode & MODE_MOUSE_ANY) {
		if ((m->b & MOUSE_BUTTON) != MOUSE_UP) {
			window_copy_update_cursor(wp, m->x, m->y);
			if (window_copy_update_selection(wp))
				window_copy_redraw_screen(wp);
			return;
		}
		goto reset_mode;
	}

	/* Otherwise if other buttons pressed, start selection and motion. */
	if ((m->b & MOUSE_BUTTON) != MOUSE_UP) {
		s->mode &= ~MODE_MOUSE_STANDARD;
		s->mode |= MODE_MOUSE_ANY;

		window_copy_update_cursor(wp, m->x, m->y);
		window_copy_start_selection(wp);
		window_copy_redraw_screen(wp);
	}

	return;

reset_mode:
	s->mode &= ~MODE_MOUSE_ANY;
	s->mode |= MODE_MOUSE_STANDARD;
	if (sess != NULL) {
		window_copy_copy_selection(wp);
		window_pane_reset_mode(wp);
	}
}

void
window_copy_scroll_to(struct window_pane *wp, u_int px, u_int py)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct grid			*gd = data->backing->grid;
	u_int				 offset, gap;

	data->cx = px;

	gap = gd->sy / 4;
	if (py < gd->sy) {
		offset = 0;
		data->cy = py;
	} else if (py > gd->hsize + gd->sy - gap) {
		offset = gd->hsize;
		data->cy = py - gd->hsize;
	} else {
		offset = py + gap - gd->sy;
		data->cy = py - offset;
	}
	data->oy = gd->hsize - offset;

	window_copy_update_selection(wp);
	window_copy_redraw_screen(wp);
}

int
window_copy_search_compare(
    struct grid *gd, u_int px, u_int py, struct grid *sgd, u_int spx)
{
	const struct grid_cell	*gc, *sgc;
	const struct grid_utf8	*gu, *sgu;

	gc = grid_peek_cell(gd, px, py);
	sgc = grid_peek_cell(sgd, spx, 0);

	if ((gc->flags & GRID_FLAG_UTF8) != (sgc->flags & GRID_FLAG_UTF8))
		return (0);

	if (gc->flags & GRID_FLAG_UTF8) {
		gu = grid_peek_utf8(gd, px, py);
		sgu = grid_peek_utf8(sgd, spx, 0);
		if (grid_utf8_compare(gu, sgu))
			return (1);
	} else {
		if (gc->data == sgc->data)
			return (1);
	}
	return (0);
}

int
window_copy_search_lr(struct grid *gd,
    struct grid *sgd, u_int *ppx, u_int py, u_int first, u_int last)
{
	u_int	ax, bx, px;

	for (ax = first; ax < last; ax++) {
		if (ax + sgd->sx >= gd->sx)
			break;
		for (bx = 0; bx < sgd->sx; bx++) {
			px = ax + bx;
			if (!window_copy_search_compare(gd, px, py, sgd, bx))
				break;
		}
		if (bx == sgd->sx) {
			*ppx = ax;
			return (1);
		}
	}
	return (0);
}

int
window_copy_search_rl(struct grid *gd,
    struct grid *sgd, u_int *ppx, u_int py, u_int first, u_int last)
{
	u_int	ax, bx, px;

	for (ax = last + 1; ax > first; ax--) {
		if (gd->sx - (ax - 1) < sgd->sx)
			continue;
		for (bx = 0; bx < sgd->sx; bx++) {
			px = ax - 1 + bx;
			if (!window_copy_search_compare(gd, px, py, sgd, bx))
				break;
		}
		if (bx == sgd->sx) {
			*ppx = ax - 1;
			return (1);
		}
	}
	return (0);
}

void
window_copy_search_up(struct window_pane *wp, const char *searchstr)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = data->backing, ss;
	struct screen_write_ctx		 ctx;
	struct grid			*gd = s->grid, *sgd;
	struct grid_cell	 	 gc;
	size_t				 searchlen;
	u_int				 i, last, fx, fy, px;
	int				 utf8flag, n, wrapped;

	if (*searchstr == '\0')
		return;
	utf8flag = options_get_number(&wp->window->options, "utf8");
	searchlen = screen_write_strlen(utf8flag, "%s", searchstr);

	screen_init(&ss, searchlen, 1, 0);
	screen_write_start(&ctx, NULL, &ss);
	memcpy(&gc, &grid_default_cell, sizeof gc);
	screen_write_nputs(&ctx, -1, &gc, utf8flag, "%s", searchstr);
	screen_write_stop(&ctx);

	fx = data->cx;
	fy = gd->hsize - data->oy + data->cy;

	if (fx == 0) {
		if (fy == 0)
			return;
		fx = gd->sx - 1;
		fy--;
	} else
		fx--;
	n = wrapped = 0;

retry:
	sgd = ss.grid;
	for (i = fy + 1; i > 0; i--) {
		last = screen_size_x(s);
		if (i == fy + 1)
			last = fx;
		n = window_copy_search_rl(gd, sgd, &px, i - 1, 0, last);
		if (n) {
			window_copy_scroll_to(wp, px, i - 1);
			break;
		}
	}
	if (!n && !wrapped) {
		fx = gd->sx - 1;
		fy = gd->hsize + gd->sy - 1;
		wrapped = 1;
		goto retry;
	}

	screen_free(&ss);
}

void
window_copy_search_down(struct window_pane *wp, const char *searchstr)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = data->backing, ss;
	struct screen_write_ctx		 ctx;
	struct grid			*gd = s->grid, *sgd;
	struct grid_cell	 	 gc;
	size_t				 searchlen;
	u_int				 i, first, fx, fy, px;
	int				 utf8flag, n, wrapped;

	if (*searchstr == '\0')
		return;
	utf8flag = options_get_number(&wp->window->options, "utf8");
	searchlen = screen_write_strlen(utf8flag, "%s", searchstr);

	screen_init(&ss, searchlen, 1, 0);
	screen_write_start(&ctx, NULL, &ss);
	memcpy(&gc, &grid_default_cell, sizeof gc);
	screen_write_nputs(&ctx, -1, &gc, utf8flag, "%s", searchstr);
	screen_write_stop(&ctx);

	fx = data->cx;
	fy = gd->hsize - data->oy + data->cy;

	if (fx == gd->sx - 1) {
		if (fy == gd->hsize + gd->sy)
			return;
		fx = 0;
		fy++;
	} else
		fx++;
	n = wrapped = 0;

retry:
	sgd = ss.grid;
	for (i = fy + 1; i < gd->hsize + gd->sy; i++) {
		first = 0;
		if (i == fy + 1)
			first = fx;
		n = window_copy_search_lr(gd, sgd, &px, i - 1, first, gd->sx);
		if (n) {
			window_copy_scroll_to(wp, px, i - 1);
			break;
		}
	}
	if (!n && !wrapped) {
		fx = 0;
		fy = 0;
		wrapped = 1;
		goto retry;
	}

	screen_free(&ss);
}

void
window_copy_goto_line(struct window_pane *wp, const char *linestr)
{
	struct window_copy_mode_data	*data = wp->modedata;
	const char			*errstr;
	u_int				 lineno;

	lineno = strtonum(linestr, 0, screen_hsize(data->backing), &errstr);
	if (errstr != NULL)
		return;

	data->oy = lineno;
	window_copy_update_selection(wp);
	window_copy_redraw_screen(wp);
}

void
window_copy_write_line(
    struct window_pane *wp, struct screen_write_ctx *ctx, u_int py)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	struct options			*oo = &wp->window->options;
	struct grid_cell		 gc;
	char				 hdr[32];
	size_t	 			 last, xoff = 0, size = 0;

	memcpy(&gc, &grid_default_cell, sizeof gc);
	colour_set_fg(&gc, options_get_number(oo, "mode-fg"));
	colour_set_bg(&gc, options_get_number(oo, "mode-bg"));
	gc.attr |= options_get_number(oo, "mode-attr");

	last = screen_size_y(s) - 1;
	if (py == 0) {
		size = xsnprintf(hdr, sizeof hdr,
		    "[%u/%u]", data->oy, screen_hsize(data->backing));
		if (size > screen_size_x(s))
			size = screen_size_x(s);
		screen_write_cursormove(ctx, screen_size_x(s) - size, 0);
		screen_write_puts(ctx, &gc, "%s", hdr);
	} else if (py == last && data->inputtype != WINDOW_COPY_OFF) {
		if (data->inputtype == WINDOW_COPY_NUMERICPREFIX) {
			xoff = size = xsnprintf(hdr, sizeof hdr,
			    "Repeat: %u", data->numprefix);
		} else {
			xoff = size = xsnprintf(hdr, sizeof hdr,
			    "%s: %s", data->inputprompt, data->inputstr);
		}
		screen_write_cursormove(ctx, 0, last);
		screen_write_puts(ctx, &gc, "%s", hdr);
	} else
		size = 0;

	screen_write_cursormove(ctx, xoff, py);
	screen_write_copy(ctx, data->backing, xoff,
	    (screen_hsize(data->backing) - data->oy) + py,
	    screen_size_x(s) - size, 1);

	if (py == data->cy && data->cx == screen_size_x(s)) {
		memcpy(&gc, &grid_default_cell, sizeof gc);
		screen_write_cursormove(ctx, screen_size_x(s) - 1, py);
		screen_write_putc(ctx, &gc, '$');
	}
}

void
window_copy_write_lines(
    struct window_pane *wp, struct screen_write_ctx *ctx, u_int py, u_int ny)
{
	u_int	yy;

	for (yy = py; yy < py + ny; yy++)
		window_copy_write_line(wp, ctx, py);
}

void
window_copy_redraw_lines(struct window_pane *wp, u_int py, u_int ny)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen_write_ctx	 	 ctx;
	u_int				 i;

	screen_write_start(&ctx, wp, NULL);
	for (i = py; i < py + ny; i++)
		window_copy_write_line(wp, &ctx, i);
	screen_write_cursormove(&ctx, data->cx, data->cy);
	screen_write_stop(&ctx);
}

void
window_copy_redraw_screen(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;

	window_copy_redraw_lines(wp, 0, screen_size_y(&data->screen));
}

void
window_copy_update_cursor(struct window_pane *wp, u_int cx, u_int cy)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	struct screen_write_ctx		 ctx;
	u_int				 old_cx, old_cy;

	old_cx = data->cx; old_cy = data->cy;
	data->cx = cx; data->cy = cy;
	if (old_cx == screen_size_x(s))
		window_copy_redraw_lines(wp, old_cy, 1);
	if (data->cx == screen_size_x(s))
		window_copy_redraw_lines(wp, data->cy, 1);
	else {
		screen_write_start(&ctx, wp, NULL);
		screen_write_cursormove(&ctx, data->cx, data->cy);
		screen_write_stop(&ctx);
	}
}

void
window_copy_start_selection(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;

	data->selx = data->cx;
	data->sely = screen_hsize(data->backing) + data->cy - data->oy;

	s->sel.flag = 1;
	window_copy_update_selection(wp);
}

int
window_copy_update_selection(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	struct options			*oo = &wp->window->options;
	struct grid_cell		 gc;
	u_int				 sx, sy, ty, cy;

	if (!s->sel.flag)
		return (0);

	/* Set colours. */
	memcpy(&gc, &grid_default_cell, sizeof gc);
	colour_set_fg(&gc, options_get_number(oo, "mode-fg"));
	colour_set_bg(&gc, options_get_number(oo, "mode-bg"));
	gc.attr |= options_get_number(oo, "mode-attr");

	/* Find top of screen. */
	ty = screen_hsize(data->backing) - data->oy;

	/* Adjust the selection. */
	sx = data->selx;
	sy = data->sely;
	if (sy < ty) {					/* above screen */
		if (!data->rectflag)
			sx = 0;
		sy = 0;
	} else if (sy > ty + screen_size_y(s) - 1) {	/* below screen */
		if (!data->rectflag)
			sx = screen_size_x(s) - 1;
		sy = screen_size_y(s) - 1;
	} else
		sy -= ty;
	sy = screen_hsize(s) + sy;

	screen_set_selection(s,
	    sx, sy, data->cx, screen_hsize(s) + data->cy, data->rectflag, &gc);

	if (data->rectflag) {
		/*
		 * Can't rely on the caller to redraw the right lines for
		 * rectangle selection - find the highest line and the number
		 * of lines, and redraw just past that in both directions
		 */
		cy = data->cy;
		if (sy < cy)
			window_copy_redraw_lines(wp, sy, cy - sy + 1);
		else
			window_copy_redraw_lines(wp, cy, sy - cy + 1);
	}

	return (1);
}

void
window_copy_copy_selection(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	char				*buf;
	size_t				 off;
	u_int				 i, xx, yy, sx, sy, ex, ey, limit;
	u_int				 firstsx, lastex, restex, restsx;

	if (!s->sel.flag)
		return;

	buf = xmalloc(1);
	off = 0;

	*buf = '\0';

	/*
	 * The selection extends from selx,sely to (adjusted) cx,cy on
	 * the base screen.
	 */

	/* Find start and end. */
	xx = data->cx;
	yy = screen_hsize(data->backing) + data->cy - data->oy;
	if (yy < data->sely || (yy == data->sely && xx < data->selx)) {
		sx = xx; sy = yy;
		ex = data->selx; ey = data->sely;
	} else {
		sx = data->selx; sy = data->sely;
		ex = xx; ey = yy;
	}

	/* Trim ex to end of line. */
	xx = window_copy_find_length(wp, ey);
	if (ex > xx)
		ex = xx;

	/*
	 * Deal with rectangle-copy if necessary; four situations: start of
	 * first line (firstsx), end of last line (lastex), start (restsx) and
	 * end (restex) of all other lines.
	 */
	xx = screen_size_x(s);
	if (data->rectflag) {
		/*
		 * Need to ignore the column with the cursor in it, which for
		 * rectangular copy means knowing which side the cursor is on.
		 */
		if (data->selx < data->cx) {
			/* Selection start is on the left. */
			lastex = data->cx;
			restex = data->cx;
			firstsx = data->selx;
			restsx = data->selx;
		} else {
			/* Cursor is on the left. */
			lastex = data->selx + 1;
			restex = data->selx + 1;
			firstsx = data->cx;
			restsx = data->cx;
		}
	} else {
		/*
		 * Like emacs, keep the top-left-most character, and drop the
		 * bottom-right-most, regardless of copy direction.
		 */
		lastex = ex;
		restex = xx;
		firstsx = sx;
		restsx = 0;
	}

	/* Copy the lines. */
	if (sy == ey)
		window_copy_copy_line(wp, &buf, &off, sy, firstsx, lastex);
	else {
		window_copy_copy_line(wp, &buf, &off, sy, firstsx, restex);
		if (ey - sy > 1) {
			for (i = sy + 1; i < ey; i++) {
				window_copy_copy_line(
				    wp, &buf, &off, i, restsx, restex);
			}
		}
		window_copy_copy_line(wp, &buf, &off, ey, restsx, lastex);
	}

	/* Don't bother if no data. */
	if (off == 0) {
		xfree(buf);
		return;
	}
	off--;	/* remove final \n */

	/* Add the buffer to the stack. */
	limit = options_get_number(&global_options, "buffer-limit");
	paste_add(&global_buffers, buf, off, limit);
}

void
window_copy_copy_line(struct window_pane *wp,
    char **buf, size_t *off, u_int sy, u_int sx, u_int ex)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct grid			*gd = data->backing->grid;
	const struct grid_cell		*gc;
	const struct grid_utf8		*gu;
	struct grid_line		*gl;
	u_int				 i, xx, wrapped = 0;
	size_t				 size;

	if (sx > ex)
		return;

	/*
	 * Work out if the line was wrapped at the screen edge and all of it is
	 * on screen.
	 */
	gl = &gd->linedata[sy];
	if (gl->flags & GRID_LINE_WRAPPED && gl->cellsize <= gd->sx)
		wrapped = 1;

	/* If the line was wrapped, don't strip spaces (use the full length). */
	if (wrapped)
		xx = gl->cellsize;
	else
		xx = window_copy_find_length(wp, sy);
	if (ex > xx)
		ex = xx;
	if (sx > xx)
		sx = xx;

	if (sx < ex) {
		for (i = sx; i < ex; i++) {
			gc = grid_peek_cell(gd, i, sy);
			if (gc->flags & GRID_FLAG_PADDING)
				continue;
			if (!(gc->flags & GRID_FLAG_UTF8)) {
				*buf = xrealloc(*buf, 1, (*off) + 1);
				(*buf)[(*off)++] = gc->data;
			} else {
				gu = grid_peek_utf8(gd, i, sy);
				size = grid_utf8_size(gu);
				*buf = xrealloc(*buf, 1, (*off) + size);
				*off += grid_utf8_copy(gu, *buf + *off, size);
			}
		}
	}

	/* Only add a newline if the line wasn't wrapped. */
	if (!wrapped || ex != xx) {
		*buf = xrealloc(*buf, 1, (*off) + 1);
		(*buf)[(*off)++] = '\n';
	}
}

void
window_copy_clear_selection(struct window_pane *wp)
{
	struct window_copy_mode_data   *data = wp->modedata;
	u_int				px, py;

	screen_clear_selection(&data->screen);

	py = screen_hsize(data->backing) + data->cy - data->oy;
	px = window_copy_find_length(wp, py);
	if (data->cx > px)
		window_copy_update_cursor(wp, px, data->cy);
}

int
window_copy_in_set(struct window_pane *wp, u_int px, u_int py, const char *set)
{
	struct window_copy_mode_data	*data = wp->modedata;
	const struct grid_cell		*gc;

	gc = grid_peek_cell(data->backing->grid, px, py);
	if (gc->flags & (GRID_FLAG_PADDING|GRID_FLAG_UTF8))
		return (0);
	if (gc->data == 0x00 || gc->data == 0x7f)
		return (0);
	return (strchr(set, gc->data) != NULL);
}

u_int
window_copy_find_length(struct window_pane *wp, u_int py)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = data->backing;
	const struct grid_cell		*gc;
	u_int				 px;

	/*
	 * If the pane has been resized, its grid can contain old overlong
	 * lines. grid_peek_cell does not allow accessing cells beyond the
	 * width of the grid, and screen_write_copy treats them as spaces, so
	 * ignore them here too.
	 */
	px = s->grid->linedata[py].cellsize;
	if (px > screen_size_x(s))
		px = screen_size_x(s);
	while (px > 0) {
		gc = grid_peek_cell(s->grid, px - 1, py);
		if (gc->flags & GRID_FLAG_UTF8)
			break;
		if (gc->data != ' ')
			break;
		px--;
	}
	return (px);
}

void
window_copy_cursor_start_of_line(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*back_s = data->backing;
	struct grid			*gd = back_s->grid;
	u_int				 py;

	if (data->cx == 0) {
		py = screen_hsize(back_s) + data->cy - data->oy;
		while (py > 0 && gd->linedata[py-1].flags & GRID_LINE_WRAPPED) {
			window_copy_cursor_up(wp, 0);
			py = screen_hsize(back_s) + data->cy - data->oy;
		}
	}
	window_copy_update_cursor(wp, 0, data->cy);
	if (window_copy_update_selection(wp))
		window_copy_redraw_lines(wp, data->cy, 1);
}

void
window_copy_cursor_back_to_indentation(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	u_int				 px, py, xx;
	const struct grid_cell		*gc;

	px = 0;
	py = screen_hsize(data->backing) + data->cy - data->oy;
	xx = window_copy_find_length(wp, py);

	while (px < xx) {
		gc = grid_peek_cell(data->backing->grid, px, py);
		if (gc->flags & GRID_FLAG_UTF8)
			break;
		if (gc->data != ' ')
			break;
		px++;
	}

	window_copy_update_cursor(wp, px, data->cy);
	if (window_copy_update_selection(wp))
		window_copy_redraw_lines(wp, data->cy, 1);
}

void
window_copy_cursor_end_of_line(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*back_s = data->backing;
	struct grid			*gd = back_s->grid;
	u_int				 px, py;

	py = screen_hsize(back_s) + data->cy - data->oy;
	px = window_copy_find_length(wp, py);

	if (data->cx == px) {
		if (data->screen.sel.flag && data->rectflag)
			px = screen_size_x(back_s);
		if (gd->linedata[py].flags & GRID_LINE_WRAPPED) {
			while (py < gd->sy + gd->hsize &&
			    gd->linedata[py].flags & GRID_LINE_WRAPPED) {
				window_copy_cursor_down(wp, 0);
				py = screen_hsize(back_s)
				     + data->cy - data->oy;
			}
			px = window_copy_find_length(wp, py);
		}
	}
	window_copy_update_cursor(wp, px, data->cy);

	if (window_copy_update_selection(wp))
		window_copy_redraw_lines(wp, data->cy, 1);
}

void
window_copy_cursor_left(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;

	if (data->cx == 0) {
		window_copy_cursor_up(wp, 0);
		window_copy_cursor_end_of_line(wp);
	} else {
		window_copy_update_cursor(wp, data->cx - 1, data->cy);
		if (window_copy_update_selection(wp))
			window_copy_redraw_lines(wp, data->cy, 1);
	}
}

void
window_copy_cursor_right(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	u_int				 px, py;

	if (data->screen.sel.flag && data->rectflag)
		px = screen_size_x(&data->screen);
	else {
		py = screen_hsize(data->backing) + data->cy - data->oy;
		px = window_copy_find_length(wp, py);
	}

	if (data->cx >= px) {
		window_copy_cursor_start_of_line(wp);
		window_copy_cursor_down(wp, 0);
	} else {
		window_copy_update_cursor(wp, data->cx + 1, data->cy);
		if (window_copy_update_selection(wp))
			window_copy_redraw_lines(wp, data->cy, 1);
	}
}

void
window_copy_cursor_up(struct window_pane *wp, int scroll_only)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	u_int				 ox, oy, px, py;

	oy = screen_hsize(data->backing) + data->cy - data->oy;
	ox = window_copy_find_length(wp, oy);
	if (ox != 0) {
		data->lastcx = data->cx;
		data->lastsx = ox;
	}

	data->cx = data->lastcx;
	if (scroll_only || data->cy == 0) {
		window_copy_scroll_down(wp, 1);
		if (scroll_only) {
			if (data->cy == screen_size_y(s) - 1)
				window_copy_redraw_lines(wp, data->cy, 1);
			else
				window_copy_redraw_lines(wp, data->cy, 2);
		}
	} else {
		window_copy_update_cursor(wp, data->cx, data->cy - 1);
		if (window_copy_update_selection(wp)) {
			if (data->cy == screen_size_y(s) - 1)
				window_copy_redraw_lines(wp, data->cy, 1);
			else
				window_copy_redraw_lines(wp, data->cy, 2);
		}
	}

	if (!data->screen.sel.flag || !data->rectflag) {
		py = screen_hsize(data->backing) + data->cy - data->oy;
		px = window_copy_find_length(wp, py);
		if ((data->cx >= data->lastsx && data->cx != px) ||
		    data->cx > px)
			window_copy_cursor_end_of_line(wp);
	}
}

void
window_copy_cursor_down(struct window_pane *wp, int scroll_only)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	u_int				 ox, oy, px, py;

	oy = screen_hsize(data->backing) + data->cy - data->oy;
	ox = window_copy_find_length(wp, oy);
	if (ox != 0) {
		data->lastcx = data->cx;
		data->lastsx = ox;
	}

	data->cx = data->lastcx;
	if (scroll_only || data->cy == screen_size_y(s) - 1) {
		window_copy_scroll_up(wp, 1);
		if (scroll_only && data->cy > 0)
			window_copy_redraw_lines(wp, data->cy - 1, 2);
	} else {
		window_copy_update_cursor(wp, data->cx, data->cy + 1);
		if (window_copy_update_selection(wp))
			window_copy_redraw_lines(wp, data->cy - 1, 2);
	}

	if (!data->screen.sel.flag || !data->rectflag) {
		py = screen_hsize(data->backing) + data->cy - data->oy;
		px = window_copy_find_length(wp, py);
		if ((data->cx >= data->lastsx && data->cx != px) ||
		    data->cx > px)
			window_copy_cursor_end_of_line(wp);
	}
}

void
window_copy_cursor_jump(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*back_s = data->backing;
	const struct grid_cell		*gc;
	u_int				 px, py, xx;

	px = data->cx + 1;
	py = screen_hsize(back_s) + data->cy - data->oy;
	xx = window_copy_find_length(wp, py);

	while (px < xx) {
		gc = grid_peek_cell(back_s->grid, px, py);
		if ((gc->flags & (GRID_FLAG_PADDING|GRID_FLAG_UTF8)) == 0
		    && gc->data == data->jumpchar) {

			window_copy_update_cursor(wp, px, data->cy);
			if (window_copy_update_selection(wp))
				window_copy_redraw_lines(wp, data->cy, 1);
			return;
		}
		px++;
	}
}

void
window_copy_cursor_jump_back(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*back_s = data->backing;
	const struct grid_cell		*gc;
	u_int				 px, py;

	px = data->cx;
	py = screen_hsize(back_s) + data->cy - data->oy;

	if (px > 0)
		px--;

	for (;;) {
		gc = grid_peek_cell(back_s->grid, px, py);
		if ((gc->flags & (GRID_FLAG_PADDING|GRID_FLAG_UTF8)) == 0
		    && gc->data == data->jumpchar) {

			window_copy_update_cursor(wp, px, data->cy);
			if (window_copy_update_selection(wp))
				window_copy_redraw_lines(wp, data->cy, 1);
			return;
		}
		if (px == 0)
			break;
		px--;
	}
}

void
window_copy_cursor_next_word(struct window_pane *wp, const char *separators)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*back_s = data->backing;
	u_int				 px, py, xx, yy;
	int				 expected = 0;

	px = data->cx;
	py = screen_hsize(back_s) + data->cy - data->oy;
	xx = window_copy_find_length(wp, py);
	yy = screen_hsize(back_s) + screen_size_y(back_s) - 1;

	/*
	 * First skip past any nonword characters and then any word characters.
	 *
	 * expected is initially set to 0 for the former and then 1 for the
	 * latter.
	 */
	do {
		while (px > xx ||
		    window_copy_in_set(wp, px, py, separators) == expected) {
			/* Move down if we're past the end of the line. */
			if (px > xx) {
				if (py == yy)
					return;
				window_copy_cursor_down(wp, 0);
				px = 0;

				py = screen_hsize(back_s) + data->cy - data->oy;
				xx = window_copy_find_length(wp, py);
			} else
				px++;
		}
		expected = !expected;
	} while (expected == 1);

	window_copy_update_cursor(wp, px, data->cy);
	if (window_copy_update_selection(wp))
		window_copy_redraw_lines(wp, data->cy, 1);
}

void
window_copy_cursor_next_word_end(struct window_pane *wp, const char *separators)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*back_s = data->backing;
	u_int				 px, py, xx, yy;
	int				 expected = 1;

	px = data->cx;
	py = screen_hsize(back_s) + data->cy - data->oy;
	xx = window_copy_find_length(wp, py);
	yy = screen_hsize(back_s) + screen_size_y(back_s) - 1;

	/*
	 * First skip past any word characters, then any nonword characters.
	 *
	 * expected is initially set to 1 for the former and then 0 for the
	 * latter.
	 */
	do {
		while (px > xx ||
		    window_copy_in_set(wp, px, py, separators) == expected) {
			/* Move down if we're past the end of the line. */
			if (px > xx) {
				if (py == yy)
					return;
				window_copy_cursor_down(wp, 0);
				px = 0;

				py = screen_hsize(back_s) + data->cy - data->oy;
				xx = window_copy_find_length(wp, py);
			} else
				px++;
		}
		expected = !expected;
	} while (expected == 0);

	window_copy_update_cursor(wp, px, data->cy);
	if (window_copy_update_selection(wp))
		window_copy_redraw_lines(wp, data->cy, 1);
}

/* Move to the previous place where a word begins. */
void
window_copy_cursor_previous_word(struct window_pane *wp, const char *separators)
{
	struct window_copy_mode_data	*data = wp->modedata;
	u_int				 px, py;

	px = data->cx;
	py = screen_hsize(data->backing) + data->cy - data->oy;

	/* Move back to the previous word character. */
	for (;;) {
		if (px > 0) {
			px--;
			if (!window_copy_in_set(wp, px, py, separators))
				break;
		} else {
			if (data->cy == 0 &&
			    (screen_hsize(data->backing) == 0 ||
			    data->oy >= screen_hsize(data->backing) - 1))
				goto out;
			window_copy_cursor_up(wp, 0);

			py = screen_hsize(data->backing) + data->cy - data->oy;
			px = window_copy_find_length(wp, py);
		}
	}

	/* Move back to the beginning of this word. */
	while (px > 0 && !window_copy_in_set(wp, px - 1, py, separators))
		px--;

out:
	window_copy_update_cursor(wp, px, data->cy);
	if (window_copy_update_selection(wp))
		window_copy_redraw_lines(wp, data->cy, 1);
}

void
window_copy_scroll_up(struct window_pane *wp, u_int ny)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	struct screen_write_ctx		 ctx;

	if (data->oy < ny)
		ny = data->oy;
	if (ny == 0)
		return;
	data->oy -= ny;

	screen_write_start(&ctx, wp, NULL);
	screen_write_cursormove(&ctx, 0, 0);
	screen_write_deleteline(&ctx, ny);
	window_copy_write_lines(wp, &ctx, screen_size_y(s) - ny, ny);
	window_copy_write_line(wp, &ctx, 0);
	if (screen_size_y(s) > 1)
		window_copy_write_line(wp, &ctx, 1);
	if (screen_size_y(s) > 3)
		window_copy_write_line(wp, &ctx, screen_size_y(s) - 2);
	if (s->sel.flag && screen_size_y(s) > ny) {
		window_copy_update_selection(wp);
		window_copy_write_line(wp, &ctx, screen_size_y(s) - ny - 1);
	}
	screen_write_cursormove(&ctx, data->cx, data->cy);
	window_copy_update_selection(wp);
	screen_write_stop(&ctx);
}

void
window_copy_scroll_down(struct window_pane *wp, u_int ny)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	struct screen_write_ctx		 ctx;

	if (ny > screen_hsize(data->backing))
		return;

	if (data->oy > screen_hsize(data->backing) - ny)
		ny = screen_hsize(data->backing) - data->oy;
	if (ny == 0)
		return;
	data->oy += ny;

	screen_write_start(&ctx, wp, NULL);
	screen_write_cursormove(&ctx, 0, 0);
	screen_write_insertline(&ctx, ny);
	window_copy_write_lines(wp, &ctx, 0, ny);
	if (s->sel.flag && screen_size_y(s) > ny) {
		window_copy_update_selection(wp);
		window_copy_write_line(wp, &ctx, ny);
	} else if (ny == 1) /* nuke position */
		window_copy_write_line(wp, &ctx, 1);
	screen_write_cursormove(&ctx, data->cx, data->cy);
	window_copy_update_selection(wp);
	screen_write_stop(&ctx);
}

void
window_copy_rectangle_toggle(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	u_int				 px, py;

	data->rectflag = !data->rectflag;

	py = screen_hsize(data->backing) + data->cy - data->oy;
	px = window_copy_find_length(wp, py);
	if (data->cx > px)
		window_copy_update_cursor(wp, px, data->cy);

	window_copy_update_selection(wp);
	window_copy_redraw_screen(wp);
}