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Add a window or pane id "tag" to each format tree and use it to separate
jobs, this means that if the same job is used for different windows or
panes (for example in pane-border-format), it will be run separately for
each pane.

/* $OpenBSD: window-copy.c,v 1.165 2017/02/03 11:57:28 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * 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 <ctype.h>
#include <stdlib.h>
#include <string.h>

#include "tmux.h"

static const char *window_copy_key_table(struct window_pane *);
static void	window_copy_command(struct window_pane *, struct client *,
		    struct session *, struct args *, struct mouse_event *);
static struct screen *window_copy_init(struct window_pane *);
static void	window_copy_free(struct window_pane *);
static void	window_copy_pagedown(struct window_pane *, int);
static void	window_copy_next_paragraph(struct window_pane *);
static void	window_copy_previous_paragraph(struct window_pane *);
static void	window_copy_resize(struct window_pane *, u_int, u_int);

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

static void	window_copy_scroll_to(struct window_pane *, u_int, u_int);
static int	window_copy_search_compare(struct grid *, u_int, u_int,
		    struct grid *, u_int, int);
static int	window_copy_search_lr(struct grid *, struct grid *, u_int *,
		    u_int, u_int, u_int, int);
static int	window_copy_search_rl(struct grid *, struct grid *, u_int *,
		    u_int, u_int, u_int, int);
static int	window_copy_search_marks(struct window_pane *, struct screen *);
static void	window_copy_clear_marks(struct window_pane *);
static void	window_copy_move_left(struct screen *, u_int *, u_int *);
static void	window_copy_move_right(struct screen *, u_int *, u_int *);
static int	window_copy_is_lowercase(const char *);
static int	window_copy_search_jump(struct window_pane *, struct grid *,
		    struct grid *, u_int, u_int, u_int, int, int, int);
static int	window_copy_search(struct window_pane *, int, int);
static int	window_copy_search_up(struct window_pane *, int);
static int	window_copy_search_down(struct window_pane *, int);
static void	window_copy_goto_line(struct window_pane *, const char *);
static void	window_copy_update_cursor(struct window_pane *, u_int, u_int);
static void	window_copy_start_selection(struct window_pane *);
static int	window_copy_adjust_selection(struct window_pane *, u_int *,
		    u_int *);
static int	window_copy_update_selection(struct window_pane *, int);
static void	window_copy_synchronize_cursor(struct window_pane *wp);
static void    *window_copy_get_selection(struct window_pane *, size_t *);
static void	window_copy_copy_buffer(struct window_pane *, const char *,
		    void *, size_t);
static void	window_copy_copy_pipe(struct window_pane *, struct session *,
		    const char *, const char *);
static void	window_copy_copy_selection(struct window_pane *, const char *);
static void	window_copy_append_selection(struct window_pane *,
		    const char *);
static void	window_copy_clear_selection(struct window_pane *);
static void	window_copy_copy_line(struct window_pane *, char **, size_t *,
		    u_int, u_int, u_int);
static int	window_copy_in_set(struct window_pane *, u_int, u_int,
		    const char *);
static u_int	window_copy_find_length(struct window_pane *, u_int);
static void	window_copy_cursor_start_of_line(struct window_pane *);
static void	window_copy_cursor_back_to_indentation(struct window_pane *);
static void	window_copy_cursor_end_of_line(struct window_pane *);
static void	window_copy_other_end(struct window_pane *);
static void	window_copy_cursor_left(struct window_pane *);
static void	window_copy_cursor_right(struct window_pane *);
static void	window_copy_cursor_up(struct window_pane *, int);
static void	window_copy_cursor_down(struct window_pane *, int);
static void	window_copy_cursor_jump(struct window_pane *);
static void	window_copy_cursor_jump_back(struct window_pane *);
static void	window_copy_cursor_jump_to(struct window_pane *, int);
static void	window_copy_cursor_jump_to_back(struct window_pane *, int);
static void	window_copy_cursor_next_word(struct window_pane *,
		    const char *);
static void	window_copy_cursor_next_word_end(struct window_pane *,
		    const char *);
static void	window_copy_cursor_previous_word(struct window_pane *,
		    const char *);
static void	window_copy_scroll_up(struct window_pane *, u_int);
static void	window_copy_scroll_down(struct window_pane *, u_int);
static void	window_copy_rectangle_toggle(struct window_pane *);
static void	window_copy_move_mouse(struct mouse_event *);
static void	window_copy_drag_update(struct client *, struct mouse_event *);

const struct window_mode window_copy_mode = {
	.init = window_copy_init,
	.free = window_copy_free,
	.resize = window_copy_resize,
	.key_table = window_copy_key_table,
	.command = window_copy_command,
};

enum {
	WINDOW_COPY_OFF,
	WINDOW_COPY_SEARCHUP,
	WINDOW_COPY_SEARCHDOWN,
	WINDOW_COPY_JUMPFORWARD,
	WINDOW_COPY_JUMPBACKWARD,
	WINDOW_COPY_JUMPTOFORWARD,
	WINDOW_COPY_JUMPTOBACKWARD,
};

enum {
	WINDOW_COPY_REL_POS_ABOVE,
	WINDOW_COPY_REL_POS_ON_SCREEN,
	WINDOW_COPY_REL_POS_BELOW,
};

/*
 * 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 started */

	u_int		 oy; /* number of lines scrolled up */

	u_int		 selx; /* beginning of selection */
	u_int		 sely;

	u_int		 endselx; /* end of selection */
	u_int		 endsely;

	enum {
		CURSORDRAG_NONE,	/* selection is independent of cursor */
		CURSORDRAG_ENDSEL,	/* end is synchronized with cursor */
		CURSORDRAG_SEL,		/* start is synchronized with cursor */
	} cursordrag;

	int		 rectflag;	/* in rectangle copy mode? */
	int		 scroll_exit;	/* exit on scroll to end? */

	u_int		 cx;
	u_int		 cy;

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

	int		 searchtype;
	char		*searchstr;
	bitstr_t        *searchmark;
	int		 searchx;
	int		 searchy;
	int		 searcho;

	int		 jumptype;
	char		 jumpchar;
};

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

	wp->modedata = data = xmalloc(sizeof *data);

	data->oy = 0;
	data->cx = 0;
	data->cy = 0;

	data->cursordrag = CURSORDRAG_NONE;

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

	data->backing_written = 0;

	data->rectflag = 0;
	data->scroll_exit = 0;

	data->searchtype = WINDOW_COPY_OFF;
	data->searchstr = NULL;
	data->searchmark = NULL;
	data->searchx = data->searchy = data->searcho = -1;

	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);
	s->sel.modekeys = options_get_number(wp->window->options, "mode-keys");

	data->backing = NULL;

	return (s);
}

void
window_copy_init_from_pane(struct window_pane *wp, int scroll_exit)
{
	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;
	data->scroll_exit = scroll_exit;

	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);
}

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

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

	free(data->searchmark);
	free(data->searchstr);

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

	free(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;
	u_int				 old_hsize, old_cy;

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

	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;
	old_cy = backing->cy;
	screen_write_vnputs(&back_ctx, 0, &gc, 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 new lines. */
	window_copy_redraw_lines(wp, old_cy, backing->cy - old_cy + 1);

	screen_write_stop(&ctx);
}

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

	oy = screen_hsize(data->backing) + data->cy - data->oy;
	ox = window_copy_find_length(wp, oy);

	if (s->sel.lineflag == LINE_SEL_LEFT_RIGHT && oy == data->sely)
		window_copy_other_end(wp);

	if (data->cx != ox) {
		data->lastcx = data->cx;
		data->lastsx = ox;
	}
	data->cx = data->lastcx;

	n = 1;
	if (screen_size_y(s) > 2) {
		if (half_page)
			n = screen_size_y(s) / 2;
		else
			n = screen_size_y(s) - 2;
	}

	if (data->oy + n > screen_hsize(data->backing))
		data->oy = screen_hsize(data->backing);
	else
		data->oy += n;

	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);
	}

	window_copy_update_selection(wp, 1);
	window_copy_redraw_screen(wp);
}

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

	oy = screen_hsize(data->backing) + data->cy - data->oy;
	ox = window_copy_find_length(wp, oy);

	if (s->sel.lineflag == LINE_SEL_RIGHT_LEFT && oy == data->sely)
		window_copy_other_end(wp);

	if (data->cx != ox) {
		data->lastcx = data->cx;
		data->lastsx = ox;
	}
	data->cx = data->lastcx;

	n = 1;
	if (screen_size_y(s) > 2) {
		if (half_page)
			n = screen_size_y(s) / 2;
		else
			n = screen_size_y(s) - 2;
	}

	if (data->oy < n)
		data->oy = 0;
	else
		data->oy -= n;

	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);
	}

	if (data->scroll_exit && data->oy == 0) {
		window_pane_reset_mode(wp);
		return;
	}

	window_copy_update_selection(wp, 1);
	window_copy_redraw_screen(wp);
}

static void
window_copy_previous_paragraph(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	u_int				 oy;

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

	while (oy > 0 && window_copy_find_length(wp, oy) == 0)
		oy--;

	while (oy > 0 && window_copy_find_length(wp, oy) > 0)
		oy--;

	window_copy_scroll_to(wp, 0, oy);
}

static void
window_copy_next_paragraph(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	u_int				 maxy, ox, oy;

	oy = screen_hsize(data->backing) + data->cy - data->oy;
	maxy = screen_hsize(data->backing) + screen_size_y(s) - 1;

	while (oy < maxy && window_copy_find_length(wp, oy) == 0)
		oy++;

	while (oy < maxy && window_copy_find_length(wp, oy) > 0)
		oy++;

	ox = window_copy_find_length(wp, oy);
	window_copy_scroll_to(wp, ox, oy);
}

static 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, 1);
	if (data->backing != &wp->base)
		screen_resize(data->backing, sx, sy, 1);

	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);

	if (data->searchmark != NULL)
		window_copy_search_marks(wp, NULL);
	data->searchx = data->cx;
	data->searchy = data->cy;
	data->searcho = data->oy;

	window_copy_redraw_screen(wp);
}

static const char *
window_copy_key_table(struct window_pane *wp)
{
	if (options_get_number(wp->window->options, "mode-keys") == MODEKEY_VI)
		return ("copy-mode-vi");
	return ("copy-mode");
}

static void
window_copy_command(struct window_pane *wp, struct client *c, struct session *s,
    struct args *args, struct mouse_event *m)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*sn = &data->screen;
	const char			*command, *argument, *ws;
	u_int				 np = wp->modeprefix;
	int				 cancel = 0, redraw = 0;
	char				 prefix;

	if (args->argc == 0)
		return;
	command = args->argv[0];

	if (m != NULL && m->valid)
		window_copy_move_mouse(m);

	if (args->argc == 1) {
		if (strcmp(command, "append-selection") == 0) {
			if (s != NULL)
				window_copy_append_selection(wp, NULL);
			window_copy_clear_selection(wp);
			redraw = 1;
		}
		if (strcmp(command, "append-selection-and-cancel") == 0) {
			if (s != NULL)
				window_copy_append_selection(wp, NULL);
			window_copy_clear_selection(wp);
			redraw = 1;
			cancel = 1;
		}
		if (strcmp(command, "back-to-indentation") == 0)
			window_copy_cursor_back_to_indentation(wp);
		if (strcmp(command, "begin-selection") == 0) {
			if (m != NULL)
				window_copy_start_drag(c, m);
			else {
				sn->sel.lineflag = LINE_SEL_NONE;
				window_copy_start_selection(wp);
				redraw = 1;
			}
		}
		if (strcmp(command, "stop-selection") == 0)
			data->cursordrag = CURSORDRAG_NONE;
		if (strcmp(command, "bottom-line") == 0) {
			data->cx = 0;
			data->cy = screen_size_y(sn) - 1;
			window_copy_update_selection(wp, 1);
			redraw = 1;
		}
		if (strcmp(command, "cancel") == 0)
			cancel = 1;
		if (strcmp(command, "clear-selection") == 0) {
			window_copy_clear_selection(wp);
			redraw = 1;
		}
		if (strcmp(command, "copy-end-of-line") == 0) {
			window_copy_start_selection(wp);
			for (; np > 1; np--)
				window_copy_cursor_down(wp, 0);
			window_copy_cursor_end_of_line(wp);
			redraw = 1;

			if (s != NULL) {
				window_copy_copy_selection(wp, NULL);
				cancel = 1;
			}
		}
		if (strcmp(command, "copy-line") == 0) {
			window_copy_cursor_start_of_line(wp);
			window_copy_start_selection(wp);
			for (; np > 1; np--)
				window_copy_cursor_down(wp, 0);
			window_copy_cursor_end_of_line(wp);
			redraw = 1;

			if (s != NULL) {
				window_copy_copy_selection(wp, NULL);
				cancel = 1;
			}
		}
		if (strcmp(command, "copy-selection") == 0) {
			if (s != NULL)
				window_copy_copy_selection(wp, NULL);
			window_copy_clear_selection(wp);
			redraw = 1;
		}
		if (strcmp(command, "copy-selection-and-cancel") == 0) {
			if (s != NULL)
				window_copy_copy_selection(wp, NULL);
			window_copy_clear_selection(wp);
			redraw = 1;
			cancel = 1;
		}
		if (strcmp(command, "cursor-down") == 0) {
			for (; np != 0; np--)
				window_copy_cursor_down(wp, 0);
		}
		if (strcmp(command, "cursor-left") == 0) {
			for (; np != 0; np--)
				window_copy_cursor_left(wp);
		}
		if (strcmp(command, "cursor-right") == 0) {
			for (; np != 0; np--)
				window_copy_cursor_right(wp);
		}
		if (strcmp(command, "cursor-up") == 0) {
			for (; np != 0; np--)
				window_copy_cursor_up(wp, 0);
		}
		if (strcmp(command, "end-of-line") == 0)
			window_copy_cursor_end_of_line(wp);
		if (strcmp(command, "halfpage-down") == 0) {
			for (; np != 0; np--)
				window_copy_pagedown(wp, 1);
		}
		if (strcmp(command, "halfpage-up") == 0) {
			for (; np != 0; np--)
				window_copy_pageup(wp, 1);
		}
		if (strcmp(command, "history-bottom") == 0) {
			data->cx = 0;
			data->cy = screen_size_y(sn) - 1;
			data->oy = 0;
			window_copy_update_selection(wp, 1);
			redraw = 1;
		}
		if (strcmp(command, "history-top") == 0) {
			data->cx = 0;
			data->cy = 0;
			data->oy = screen_hsize(data->backing);
			window_copy_update_selection(wp, 1);
			redraw = 1;
		}
		if (strcmp(command, "jump-again") == 0) {
			switch (data->jumptype) {
			case WINDOW_COPY_JUMPFORWARD:
				for (; np != 0; np--)
					window_copy_cursor_jump(wp);
				break;
			case WINDOW_COPY_JUMPBACKWARD:
				for (; np != 0; np--)
					window_copy_cursor_jump_back(wp);
				break;
			case WINDOW_COPY_JUMPTOFORWARD:
				for (; np != 0; np--)
					window_copy_cursor_jump_to(wp, 1);
				break;
			case WINDOW_COPY_JUMPTOBACKWARD:
				for (; np != 0; np--)
					window_copy_cursor_jump_to_back(wp, 1);
				break;
			}
		}
		if (strcmp(command, "jump-reverse") == 0) {
			switch (data->jumptype) {
			case WINDOW_COPY_JUMPFORWARD:
				for (; np != 0; np--)
					window_copy_cursor_jump_back(wp);
				break;
			case WINDOW_COPY_JUMPBACKWARD:
				for (; np != 0; np--)
					window_copy_cursor_jump(wp);
				break;
			case WINDOW_COPY_JUMPTOFORWARD:
				for (; np != 0; np--)
					window_copy_cursor_jump_to_back(wp, 1);
				break;
			case WINDOW_COPY_JUMPTOBACKWARD:
				for (; np != 0; np--)
					window_copy_cursor_jump_to(wp, 1);
				break;
			}
		}
		if (strcmp(command, "middle-line") == 0) {
			data->cx = 0;
			data->cy = (screen_size_y(sn) - 1) / 2;
			window_copy_update_selection(wp, 1);
			redraw = 1;
		}
		if (strcmp(command, "next-paragraph") == 0) {
			for (; np != 0; np--)
				window_copy_next_paragraph(wp);
		}
		if (strcmp(command, "next-space") == 0) {
			for (; np != 0; np--)
				window_copy_cursor_next_word(wp, " ");
		}
		if (strcmp(command, "next-space-end") == 0) {
			for (; np != 0; np--)
				window_copy_cursor_next_word_end(wp, " ");
		}
		if (strcmp(command, "next-word") == 0) {
			ws = options_get_string(s->options, "word-separators");
			for (; np != 0; np--)
				window_copy_cursor_next_word(wp, ws);
		}
		if (strcmp(command, "next-word-end") == 0) {
			ws = options_get_string(s->options, "word-separators");
			for (; np != 0; np--)
				window_copy_cursor_next_word_end(wp, ws);
		}
		if (strcmp(command, "other-end") == 0) {
			if ((np % 2) != 0)
				window_copy_other_end(wp);
		}
		if (strcmp(command, "page-down") == 0) {
			for (; np != 0; np--)
				window_copy_pagedown(wp, 0);
		}
		if (strcmp(command, "page-up") == 0) {
			for (; np != 0; np--)
				window_copy_pageup(wp, 0);
		}
		if (strcmp(command, "previous-paragraph") == 0) {
			for (; np != 0; np--)
				window_copy_previous_paragraph(wp);
		}
		if (strcmp(command, "previous-space") == 0) {
			for (; np != 0; np--)
				window_copy_cursor_previous_word(wp, " ");
		}
		if (strcmp(command, "previous-word") == 0) {
			ws = options_get_string(s->options, "word-separators");
			for (; np != 0; np--)
				window_copy_cursor_previous_word(wp, ws);
		}
		if (strcmp(command, "rectangle-toggle") == 0) {
			sn->sel.lineflag = LINE_SEL_NONE;
			window_copy_rectangle_toggle(wp);
		}
		if (strcmp(command, "scroll-down") == 0) {
			for (; np != 0; np--)
				window_copy_cursor_down(wp, 1);
			if (data->scroll_exit && data->oy == 0)
				cancel = 1;
		}
		if (strcmp(command, "scroll-up") == 0) {
			for (; np != 0; np--)
				window_copy_cursor_up(wp, 1);
		}
		if (strcmp(command, "search-again") == 0) {
			if (data->searchtype == WINDOW_COPY_SEARCHUP) {
				for (; np != 0; np--)
					window_copy_search_up(wp, 1);
			} else if (data->searchtype == WINDOW_COPY_SEARCHDOWN) {
				for (; np != 0; np--)
					window_copy_search_down(wp, 1);
			}
		}
		if (strcmp(command, "search-reverse") == 0) {
			if (data->searchtype == WINDOW_COPY_SEARCHUP) {
				for (; np != 0; np--)
					window_copy_search_down(wp, 1);
			} else if (data->searchtype == WINDOW_COPY_SEARCHDOWN) {
				for (; np != 0; np--)
					window_copy_search_up(wp, 1);
			}
		}
		if (strcmp(command, "select-line") == 0) {
			sn->sel.lineflag = LINE_SEL_LEFT_RIGHT;
			data->rectflag = 0;
			window_copy_cursor_start_of_line(wp);
			window_copy_start_selection(wp);
			for (; np > 1; np--)
				window_copy_cursor_down(wp, 0);
			window_copy_cursor_end_of_line(wp);
			redraw = 1;
		}
		if (strcmp(command, "select-word") == 0) {
			sn->sel.lineflag = LINE_SEL_LEFT_RIGHT;
			data->rectflag = 0;
			ws = options_get_string(s->options, "word-separators");
			window_copy_cursor_previous_word(wp, ws);
			window_copy_start_selection(wp);
			window_copy_cursor_next_word_end(wp, ws);
			redraw = 1;
		}
		if (strcmp(command, "start-of-line") == 0)
			window_copy_cursor_start_of_line(wp);
		if (strcmp(command, "top-line") == 0) {
			data->cx = 0;
			data->cy = 0;
			window_copy_update_selection(wp, 1);
			redraw = 1;
		}
	} else if (args->argc == 2 && *args->argv[1] != '\0') {
		argument = args->argv[1];
		if (strcmp(command, "copy-pipe") == 0) {
			if (s != NULL)
				window_copy_copy_pipe(wp, s, NULL, argument);
		}
		if (strcmp(command, "copy-pipe-and-cancel") == 0) {
			if (s != NULL) {
				window_copy_copy_pipe(wp, s, NULL, argument);
				cancel = 1;
			}
		}
		if (strcmp(command, "goto-line") == 0)
			window_copy_goto_line(wp, argument);
		if (strcmp(command, "jump-backward") == 0) {
			data->jumptype = WINDOW_COPY_JUMPBACKWARD;
			data->jumpchar = *argument;
			for (; np != 0; np--)
				window_copy_cursor_jump_back(wp);
		}
		if (strcmp(command, "jump-forward") == 0) {
			data->jumptype = WINDOW_COPY_JUMPFORWARD;
			data->jumpchar = *argument;
			for (; np != 0; np--)
				window_copy_cursor_jump(wp);
		}
		if (strcmp(command, "jump-to-backward") == 0) {
			data->jumptype = WINDOW_COPY_JUMPTOBACKWARD;
			data->jumpchar = *argument;
			for (; np != 0; np--)
				window_copy_cursor_jump_to_back(wp, 1);
		}
		if (strcmp(command, "jump-to-forward") == 0) {
			data->jumptype = WINDOW_COPY_JUMPTOFORWARD;
			data->jumpchar = *argument;
			for (; np != 0; np--)
				window_copy_cursor_jump_to(wp, 1);
		}
		if (strcmp(command, "search-backward") == 0) {
			data->searchtype = WINDOW_COPY_SEARCHUP;
			free(data->searchstr);
			data->searchstr = xstrdup(argument);
			for (; np != 0; np--)
				window_copy_search_up(wp, 1);
		}
		if (strcmp(command, "search-forward") == 0) {
			data->searchtype = WINDOW_COPY_SEARCHDOWN;
			free(data->searchstr);
			data->searchstr = xstrdup(argument);
			for (; np != 0; np--)
				window_copy_search_down(wp, 1);
		}
		if (strcmp(command, "search-backward-incremental") == 0) {
			prefix = *argument++;
			if (data->searchx == -1 || data->searchy == -1) {
				data->searchx = data->cx;
				data->searchy = data->cy;
				data->searcho = data->oy;
			} else if (data->searchstr != NULL &&
			    strcmp(argument, data->searchstr) != 0) {
				data->cx = data->searchx;
				data->cy = data->searchy;
				data->oy = data->searcho;
				redraw = 1;
			}
			if (*argument == '\0') {
				window_copy_clear_marks(wp);
				redraw = 1;
			} else if (prefix == '=' || prefix == '-') {
				data->searchtype = WINDOW_COPY_SEARCHUP;
				free(data->searchstr);
				data->searchstr = xstrdup(argument);
				if (!window_copy_search_up(wp, 1)) {
					window_copy_clear_marks(wp);
					redraw = 1;
				}
			} else if (prefix == '+') {
				data->searchtype = WINDOW_COPY_SEARCHDOWN;
				free(data->searchstr);
				data->searchstr = xstrdup(argument);
				if (!window_copy_search_down(wp, 1)) {
					window_copy_clear_marks(wp);
					redraw = 1;
				}
			}
		}
		if (strcmp(command, "search-forward-incremental") == 0) {
			prefix = *argument++;
			if (data->searchx == -1 || data->searchy == -1) {
				data->searchx = data->cx;
				data->searchy = data->cy;
				data->searcho = data->oy;
			} else if (data->searchstr != NULL &&
			    strcmp(argument, data->searchstr) != 0) {
				data->cx = data->searchx;
				data->cy = data->searchy;
				data->oy = data->searcho;
				redraw = 1;
			}
			if (*argument == '\0') {
				window_copy_clear_marks(wp);
				redraw = 1;
			} else if (prefix == '=' || prefix == '+') {
				data->searchtype = WINDOW_COPY_SEARCHDOWN;
				free(data->searchstr);
				data->searchstr = xstrdup(argument);
				if (!window_copy_search_down(wp, 1)) {
					window_copy_clear_marks(wp);
					redraw = 1;
				}
			} else if (prefix == '-') {
				data->searchtype = WINDOW_COPY_SEARCHUP;
				free(data->searchstr);
				data->searchstr = xstrdup(argument);
				if (!window_copy_search_up(wp, 1)) {
					window_copy_clear_marks(wp);
					redraw = 1;
				}
			}
		}
	}

	if (strncmp(command, "search-", 7) != 0 && data->searchmark != NULL) {
		window_copy_clear_marks(wp);
		redraw = 1;
		data->searchx = data->searchy = -1;
	}

	if (cancel)
		window_pane_reset_mode(wp);
	else if (redraw)
		window_copy_redraw_screen(wp);
	wp->modeprefix = 1;
}

static 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, 1);
	window_copy_redraw_screen(wp);
}

static int
window_copy_search_compare(struct grid *gd, u_int px, u_int py,
    struct grid *sgd, u_int spx, int cis)
{
	struct grid_cell	 gc, sgc;
	const struct utf8_data	*ud, *sud;

	grid_get_cell(gd, px, py, &gc);
	ud = &gc.data;
	grid_get_cell(sgd, spx, 0, &sgc);
	sud = &sgc.data;

	if (ud->size != sud->size || ud->width != sud->width)
		return (0);

	if (cis && ud->size == 1)
		return (tolower(ud->data[0]) == sud->data[0]);

	return (memcmp(ud->data, sud->data, ud->size) == 0);
}

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

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

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

	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;
			matched = window_copy_search_compare(gd, px, py, sgd,
			    bx, cis);
			if (!matched)
				break;
		}
		if (bx == sgd->sx) {
			*ppx = ax - 1;
			return (1);
		}
	}
	return (0);
}

static void
window_copy_move_left(struct screen *s, u_int *fx, u_int *fy)
{
	if (*fx == 0) {	/* left */
		if (*fy == 0) /* top */
			return;
		*fx = screen_size_x(s) - 1;
		*fy = *fy - 1;
	} else
		*fx = *fx - 1;
}

static void
window_copy_move_right(struct screen *s, u_int *fx, u_int *fy)
{
	if (*fx == screen_size_x(s) - 1) { /* right */
		if (*fy == screen_hsize(s) + screen_size_y(s)) /* bottom */
			return;
		*fx = 0;
		*fy = *fy + 1;
	} else
		*fx = *fx + 1;
}

static int
window_copy_is_lowercase(const char *ptr)
{
	while (*ptr != '\0') {
		if (*ptr != tolower((u_char)*ptr))
			return (0);
		++ptr;
	}
	return (1);
}

/*
 * Search for text stored in sgd starting from position fx,fy up to endline. If
 * found, jump to it. If cis then ignore case. The direction is 0 for searching
 * up, down otherwise. If wrap then go to begin/end of grid and try again if
 * not found.
 */
static int
window_copy_search_jump(struct window_pane *wp, struct grid *gd,
    struct grid *sgd, u_int fx, u_int fy, u_int endline, int cis, int wrap,
    int direction)
{
	u_int	i, px;
	int	found;

	found = 0;
	if (direction) {
		for (i = fy; i <= endline; i++) {
			found = window_copy_search_lr(gd, sgd, &px, i, fx,
			    gd->sx, cis);
			if (found)
				break;
			fx = 0;
		}
	} else {
		for (i = fy + 1; endline < i; i--) {
			found = window_copy_search_rl(gd, sgd, &px, i - 1, 0,
			    fx, cis);
			if (found) {
				i--;
				break;
			}
			fx = gd->sx;
		}
	}

	if (found) {
		window_copy_scroll_to(wp, px, i);
		return (1);
	}
	if (wrap) {
		return (window_copy_search_jump(wp, gd, sgd,
		    direction ? 0 : gd->sx - 1,
		    direction ? 0 : gd->hsize + gd->sy - 1, fy, cis, 0,
		    direction));
	}
	return (0);
}

/*
 * Search in for text searchstr. If direction is 0 then search up, otherwise
 * down. If moveflag is 0 then look for string at the current cursor position
 * as well.
 */
static int
window_copy_search(struct window_pane *wp, int direction, int moveflag)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = data->backing, ss;
	struct screen_write_ctx		 ctx;
	struct grid			*gd = s->grid;
	u_int				 fx, fy, endline;
	int				 wrapflag, cis, found;

	fx = data->cx;
	fy = screen_hsize(data->backing) - data->oy + data->cy;

	screen_init(&ss, screen_write_strlen("%s", data->searchstr), 1, 0);
	screen_write_start(&ctx, NULL, &ss);
	screen_write_nputs(&ctx, -1, &grid_default_cell, "%s", data->searchstr);
	screen_write_stop(&ctx);

	if (moveflag) {
		if (direction)
			window_copy_move_right(s, &fx, &fy);
		else
			window_copy_move_left(s, &fx, &fy);
	}
	window_copy_clear_selection(wp);

	wrapflag = options_get_number(wp->window->options, "wrap-search");
	cis = window_copy_is_lowercase(data->searchstr);

	if (direction)
		endline = gd->hsize + gd->sy - 1;
	else
		endline = 0;
	found = window_copy_search_jump(wp, gd, ss.grid, fx, fy, endline, cis,
	    wrapflag, direction);

	if (window_copy_search_marks(wp, &ss))
		window_copy_redraw_screen(wp);

	screen_free(&ss);
	return (found);
}

static int
window_copy_search_marks(struct window_pane *wp, struct screen *ssp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = data->backing, ss;
	struct screen_write_ctx		 ctx;
	struct grid			*gd = s->grid;
	int				 found, cis;
	u_int				 px, py, b, nfound = 0, width;

	if (ssp == NULL) {
		width = screen_write_strlen("%s", data->searchstr);
		screen_init(&ss, width, 1, 0);
		screen_write_start(&ctx, NULL, &ss);
		screen_write_nputs(&ctx, -1, &grid_default_cell, "%s",
		    data->searchstr);
		screen_write_stop(&ctx);
		ssp = &ss;
	} else
		width = screen_size_x(ssp);

	cis = window_copy_is_lowercase(data->searchstr);

	free(data->searchmark);
	data->searchmark = bit_alloc((gd->hsize + gd->sy) * gd->sx);

	for (py = 0; py < gd->hsize + gd->sy; py++) {
		px = 0;
		for (;;) {
			found = window_copy_search_lr(gd, ssp->grid, &px, py,
			    px, gd->sx, cis);
			if (!found)
				break;
			nfound++;

			b = (py * gd->sx) + px;
			bit_nset(data->searchmark, b, b + width - 1);

			px++;
		}
	}

	if (ssp == &ss)
		screen_free(&ss);
	return (nfound);
}

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

	free(data->searchmark);
	data->searchmark = NULL;
}

static int
window_copy_search_up(struct window_pane *wp, int moveflag)
{
	return (window_copy_search(wp, 0, moveflag));
}

static int
window_copy_search_down(struct window_pane *wp, int moveflag)
{
	return (window_copy_search(wp, 1, moveflag));
}

static 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, 1);
	window_copy_redraw_screen(wp);
}

static 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[512];
	size_t				 size = 0;

	style_apply(&gc, oo, "mode-style");
	gc.flags |= GRID_FLAG_NOPALETTE;

	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
		size = 0;

	if (size < screen_size_x(s)) {
		screen_write_cursormove(ctx, 0, py);
		screen_write_copy(ctx, data->backing, 0,
		    (screen_hsize(data->backing) - data->oy) + py,
		    screen_size_x(s) - size, 1, data->searchmark, &gc);
	}

	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, '$');
	}
}

static 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);
}

static void
window_copy_redraw_selection(struct window_pane *wp, u_int old_y)
{
	struct window_copy_mode_data	*data = wp->modedata;
	u_int				 new_y, start, end;

	new_y = data->cy;
	if (old_y <= new_y) {
		start = old_y;
		end = new_y;
	} else {
		start = new_y;
		end = old_y;
	}
	window_copy_redraw_lines(wp, start, end - start + 1);
}

static 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);
}

static 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));
}

static void
window_copy_synchronize_cursor(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	u_int				 xx, yy;

	xx = data->cx;
	yy = screen_hsize(data->backing) + data->cy - data->oy;

	switch (data->cursordrag) {
	case CURSORDRAG_ENDSEL:
		data->endselx = xx;
		data->endsely = yy;
		break;
	case CURSORDRAG_SEL:
		data->selx = xx;
		data->sely = yy;
		break;
	case CURSORDRAG_NONE:
		break;
	}
}

static 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);
	}
}

static 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;

	data->endselx = data->selx;
	data->endsely = data->sely;

	data->cursordrag = CURSORDRAG_ENDSEL;

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

static int
window_copy_adjust_selection(struct window_pane *wp, u_int *selx, u_int *sely)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	u_int 				 sx, sy, ty;
	int				 relpos;

	sx = *selx;
	sy = *sely;

	ty = screen_hsize(data->backing) - data->oy;
	if (sy < ty) {
		relpos = WINDOW_COPY_REL_POS_ABOVE;
		if (!data->rectflag)
			sx = 0;
		sy = 0;
	} else if (sy > ty + screen_size_y(s) - 1) {
		relpos = WINDOW_COPY_REL_POS_BELOW;
		if (!data->rectflag)
			sx = screen_size_x(s) - 1;
		sy = screen_size_y(s) - 1;
	} else {
		relpos = WINDOW_COPY_REL_POS_ON_SCREEN;
		sy -= ty;
	}

	*selx = sx;
	*sely = screen_hsize(s) + sy;
	return (relpos);
}

static int
window_copy_update_selection(struct window_pane *wp, int may_redraw)
{
	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, cy, endsx, endsy;
	int				 startrelpos, endrelpos;

	if (!s->sel.flag && s->sel.lineflag == LINE_SEL_NONE)
		return (0);

	window_copy_synchronize_cursor(wp);

	/* Adjust the selection. */
	sx = data->selx;
	sy = data->sely;
	startrelpos = window_copy_adjust_selection(wp, &sx, &sy);

	/* Adjust the end of selection. */
	endsx = data->endselx;
	endsy = data->endsely;
	endrelpos = window_copy_adjust_selection(wp, &endsx, &endsy);

	/* Selection is outside of the current screen */
	if (startrelpos == endrelpos &&
	    startrelpos != WINDOW_COPY_REL_POS_ON_SCREEN) {
		screen_hide_selection(s);
		return (0);
	}

	/* Set colours and selection. */
	style_apply(&gc, oo, "mode-style");
	gc.flags |= GRID_FLAG_NOPALETTE;
	screen_set_selection(s, sx, sy, endsx, endsy, data->rectflag, &gc);

	if (data->rectflag && may_redraw) {
		/*
		 * 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);
}

static void *
window_copy_get_selection(struct window_pane *wp, size_t *len)
{
	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, ey_last;
	u_int				 firstsx, lastex, restex, restsx;
	int				 keys;

	if (!s->sel.flag && s->sel.lineflag == LINE_SEL_NONE)
		return (NULL);

	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->endselx;
	yy = data->endsely;
	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. */
	ey_last = window_copy_find_length(wp, ey);
	if (ex > ey_last)
		ex = ey_last;

	/*
	 * 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);

	/*
	 * Behave according to mode-keys. If it is emacs, copy like emacs,
	 * keeping the top-left-most character, and dropping the
	 * bottom-right-most, regardless of copy direction. If it is vi, also
	 * keep bottom-right-most character.
	 */
	keys = options_get_number(wp->window->options, "mode-keys");
	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. */
			if (keys == MODEKEY_EMACS) {
				lastex = data->cx;
				restex = data->cx;
			}
			else {
				lastex = data->cx + 1;
				restex = data->cx + 1;
			}
			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 {
		if (keys == MODEKEY_EMACS)
			lastex = ex;
		else
			lastex = ex + 1;
		restex = xx;
		firstsx = sx;
		restsx = 0;
	}

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

	/* Don't bother if no data. */
	if (off == 0) {
		free(buf);
		return (NULL);
	}
	if (keys == MODEKEY_EMACS || lastex <= ey_last)
		off -= 1; /* remove final \n (unless at end in vi mode) */
	*len = off;
	return (buf);
}

static void
window_copy_copy_buffer(struct window_pane *wp, const char *bufname, void *buf,
    size_t len)
{
	struct screen_write_ctx	ctx;

	if (options_get_number(global_options, "set-clipboard")) {
		screen_write_start(&ctx, wp, NULL);
		screen_write_setselection(&ctx, buf, len);
		screen_write_stop(&ctx);
	}

	if (paste_set(buf, len, bufname, NULL) != 0)
		free(buf);
}

static void
window_copy_copy_pipe(struct window_pane *wp, struct session *sess,
    const char *bufname, const char *arg)
{
	void			*buf;
	size_t			 len;
	struct job		*job;
	struct format_tree	*ft;
	char			*expanded;

	buf = window_copy_get_selection(wp, &len);
	if (buf == NULL)
		return;

	ft = format_create(NULL, FORMAT_NONE, 0);
	format_defaults(ft, NULL, sess, NULL, wp);
	expanded = format_expand(ft, arg);

	job = job_run(expanded, sess, NULL, NULL, NULL, NULL);
	bufferevent_write(job->event, buf, len);

	free(expanded);
	format_free(ft);

	window_copy_copy_buffer(wp, bufname, buf, len);
}

static void
window_copy_copy_selection(struct window_pane *wp, const char *bufname)
{
	void	*buf;
	size_t	 len;

	buf = window_copy_get_selection(wp, &len);
	if (buf == NULL)
		return;

	window_copy_copy_buffer(wp, bufname, buf, len);
}

static void
window_copy_append_selection(struct window_pane *wp, const char *bufname)
{
	char				*buf;
	struct paste_buffer		*pb;
	const char			*bufdata;
	size_t				 len, bufsize;
	struct screen_write_ctx		 ctx;

	buf = window_copy_get_selection(wp, &len);
	if (buf == NULL)
		return;

	if (options_get_number(global_options, "set-clipboard")) {
		screen_write_start(&ctx, wp, NULL);
		screen_write_setselection(&ctx, buf, len);
		screen_write_stop(&ctx);
	}

	if (bufname == NULL || *bufname == '\0')
		pb = paste_get_top(&bufname);
	else
		pb = paste_get_name(bufname);
	if (pb != NULL) {
		bufdata = paste_buffer_data(pb, &bufsize);
		buf = xrealloc(buf, len + bufsize);
		memmove(buf + bufsize, buf, len);
		memcpy(buf, bufdata, bufsize);
		len += bufsize;
	}
	if (paste_set(buf, len, bufname, NULL) != 0)
		free(buf);
}

static 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;
	struct grid_cell		 gc;
	struct grid_line		*gl;
	struct utf8_data		 ud;
	u_int				 i, xx, wrapped = 0;
	const char			*s;

	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++) {
			grid_get_cell(gd, i, sy, &gc);
			if (gc.flags & GRID_FLAG_PADDING)
				continue;
			utf8_copy(&ud, &gc.data);
			if (ud.size == 1 && (gc.attr & GRID_ATTR_CHARSET)) {
				s = tty_acs_get(NULL, ud.data[0]);
				if (s != NULL && strlen(s) <= sizeof ud.data) {
					ud.size = strlen(s);
					memcpy(ud.data, s, ud.size);
				}
			}

			*buf = xrealloc(*buf, (*off) + ud.size);
			memcpy(*buf + *off, ud.data, ud.size);
			*off += ud.size;
		}
	}

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

static 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);

	data->cursordrag = CURSORDRAG_NONE;

	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);
}

static 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;
	struct grid_cell		 gc;
	const struct utf8_data		*ud;

	grid_get_cell(data->backing->grid, px, py, &gc);

	ud = &gc.data;
	if (ud->size != 1 || (gc.flags & GRID_FLAG_PADDING))
		return (0);
	if (*ud->data == 0x00 || *ud->data == 0x7f)
		return (0);
	return (strchr(set, *ud->data) != NULL);
}

static 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;
	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) {
		grid_get_cell(s->grid, px - 1, py, &gc);
		if (gc.data.size != 1 || *gc.data.data != ' ')
			break;
		px--;
	}
	return (px);
}

static 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 screen			*s = &data->screen;
	struct grid			*gd = back_s->grid;
	u_int				 py;

	if (data->cx == 0 && s->sel.lineflag == LINE_SEL_NONE) {
		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, 1))
		window_copy_redraw_lines(wp, data->cy, 1);
}

static void
window_copy_cursor_back_to_indentation(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	u_int				 px, py, xx;
	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) {
		grid_get_cell(data->backing->grid, px, py, &gc);
		if (gc.data.size != 1 || *gc.data.data != ' ')
			break;
		px++;
	}

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

static 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 screen			*s = &data->screen;
	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 && s->sel.lineflag == LINE_SEL_NONE) {
		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, 1))
		window_copy_redraw_lines(wp, data->cy, 1);
}

static void
window_copy_other_end(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;
	u_int				 selx, sely, cy, yy, hsize;

	if (!s->sel.flag && s->sel.lineflag == LINE_SEL_NONE)
		return;

	if (s->sel.lineflag == LINE_SEL_LEFT_RIGHT)
		s->sel.lineflag = LINE_SEL_RIGHT_LEFT;
	else if (s->sel.lineflag == LINE_SEL_RIGHT_LEFT)
		s->sel.lineflag = LINE_SEL_LEFT_RIGHT;

	switch (data->cursordrag) {
		case CURSORDRAG_NONE:
		case CURSORDRAG_SEL:
			data->cursordrag = CURSORDRAG_ENDSEL;
			break;
		case CURSORDRAG_ENDSEL:
			data->cursordrag = CURSORDRAG_SEL;
			break;
	}

	selx = data->endselx;
	sely = data->endsely;
	if (data->cursordrag == CURSORDRAG_SEL) {
		selx = data->selx;
		sely = data->sely;
	}

	cy = data->cy;
	yy = screen_hsize(data->backing) + data->cy - data->oy;

	data->cx = selx;

	hsize = screen_hsize(data->backing);
	if (sely < hsize - data->oy) { /* above */
		data->oy = hsize - sely;
		data->cy = 0;
	} else if (sely > hsize - data->oy + screen_size_y(s)) { /* below */
		data->oy = hsize - sely + screen_size_y(s) - 1;
		data->cy = screen_size_y(s) - 1;
	} else
		data->cy = cy + sely - yy;

	window_copy_update_selection(wp, 1);
	window_copy_redraw_screen(wp);
}

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

	py = screen_hsize(data->backing) + data->cy - data->oy;
	if (data->cx == 0 && py > 0) {
		window_copy_cursor_up(wp, 0);
		window_copy_cursor_end_of_line(wp);
	} else if (data->cx > 0) {
		window_copy_update_cursor(wp, data->cx - 1, data->cy);
		if (window_copy_update_selection(wp, 1))
			window_copy_redraw_lines(wp, data->cy, 1);
	}
}

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

	py = screen_hsize(data->backing) + data->cy - data->oy;
	yy = screen_hsize(data->backing) + screen_size_y(data->backing) - 1;
	if (data->screen.sel.flag && data->rectflag)
		px = screen_size_x(&data->screen);
	else {
		px = window_copy_find_length(wp, py);
	}

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

static 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 (data->cx != ox) {
		data->lastcx = data->cx;
		data->lastsx = ox;
	}

	if (s->sel.lineflag == LINE_SEL_LEFT_RIGHT && oy == data->sely)
		window_copy_other_end(wp);

	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, 1)) {
			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);
	}

	if (s->sel.lineflag == LINE_SEL_LEFT_RIGHT)
		window_copy_cursor_end_of_line(wp);
	else if (s->sel.lineflag == LINE_SEL_RIGHT_LEFT)
		window_copy_cursor_start_of_line(wp);
}

static 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 (data->cx != ox) {
		data->lastcx = data->cx;
		data->lastsx = ox;
	}

	if (s->sel.lineflag == LINE_SEL_RIGHT_LEFT && oy == data->sely)
		window_copy_other_end(wp);

	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, 1))
			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);
	}

	if (s->sel.lineflag == LINE_SEL_LEFT_RIGHT)
		window_copy_cursor_end_of_line(wp);
	else if (s->sel.lineflag == LINE_SEL_RIGHT_LEFT)
		window_copy_cursor_start_of_line(wp);
}

static void
window_copy_cursor_jump(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*back_s = data->backing;
	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) {
		grid_get_cell(back_s->grid, px, py, &gc);
		if (!(gc.flags & GRID_FLAG_PADDING) &&
		    gc.data.size == 1 && *gc.data.data == data->jumpchar) {
			window_copy_update_cursor(wp, px, data->cy);
			if (window_copy_update_selection(wp, 1))
				window_copy_redraw_lines(wp, data->cy, 1);
			return;
		}
		px++;
	}
}

static void
window_copy_cursor_jump_back(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;
	struct screen			*back_s = data->backing;
	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 (;;) {
		grid_get_cell(back_s->grid, px, py, &gc);
		if (!(gc.flags & GRID_FLAG_PADDING) &&
		    gc.data.size == 1 && *gc.data.data == data->jumpchar) {
			window_copy_update_cursor(wp, px, data->cy);
			if (window_copy_update_selection(wp, 1))
				window_copy_redraw_lines(wp, data->cy, 1);
			return;
		}
		if (px == 0)
			break;
		px--;
	}
}

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

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

	while (px < xx) {
		grid_get_cell(back_s->grid, px, py, &gc);
		if (!(gc.flags & GRID_FLAG_PADDING) &&
		    gc.data.size == 1 && *gc.data.data == data->jumpchar) {
			window_copy_update_cursor(wp, px - 1, data->cy);
			if (window_copy_update_selection(wp, 1))
				window_copy_redraw_lines(wp, data->cy, 1);
			return;
		}
		px++;
	}
}

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

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

	if (px > 0)
		px--;

	if (jump_again && px > 0)
		px--;

	for (;;) {
		grid_get_cell(back_s->grid, px, py, &gc);
		if (!(gc.flags & GRID_FLAG_PADDING) &&
		    gc.data.size == 1 && *gc.data.data == data->jumpchar) {
			window_copy_update_cursor(wp, px + 1, data->cy);
			if (window_copy_update_selection(wp, 1))
				window_copy_redraw_lines(wp, data->cy, 1);
			return;
		}
		if (px == 0)
			break;
		px--;
	}
}

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

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

	keys = options_get_number(oo, "mode-keys");
	if (keys == MODEKEY_VI && !window_copy_in_set(wp, px, py, separators))
		px++;

	/*
	 * 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);

	if (keys == MODEKEY_VI && px != 0)
		px--;

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

/* Move to the previous place where a word begins. */
static 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, 1))
		window_copy_redraw_lines(wp, data->cy, 1);
}

static 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;

	window_copy_update_selection(wp, 0);

	screen_write_start(&ctx, wp, NULL);
	screen_write_cursormove(&ctx, 0, 0);
	screen_write_deleteline(&ctx, ny, 8);
	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_write_line(wp, &ctx, screen_size_y(s) - ny - 1);
	screen_write_cursormove(&ctx, data->cx, data->cy);
	screen_write_stop(&ctx);
}

static 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;

	window_copy_update_selection(wp, 0);

	screen_write_start(&ctx, wp, NULL);
	screen_write_cursormove(&ctx, 0, 0);
	screen_write_insertline(&ctx, ny, 8);
	window_copy_write_lines(wp, &ctx, 0, ny);
	if (s->sel.flag && screen_size_y(s) > ny)
		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);
	screen_write_stop(&ctx);
}

int
window_copy_scroll_position(struct window_pane *wp)
{
	struct window_copy_mode_data	*data = wp->modedata;

	if (wp->mode != &window_copy_mode)
		return (-1);
	return (data->oy);
}

static 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, 1);
	window_copy_redraw_screen(wp);
}

static void
window_copy_move_mouse(struct mouse_event *m)
{
	struct window_pane	*wp;
	u_int			 x, y;

	wp = cmd_mouse_pane(m, NULL, NULL);
	if (wp == NULL || wp->mode != &window_copy_mode)
		return;

	if (cmd_mouse_at(wp, m, &x, &y, 1) != 0)
		return;

	window_copy_update_cursor(wp, x, y);
}

void
window_copy_start_drag(struct client *c, struct mouse_event *m)
{
	struct window_pane	*wp;
	u_int			 x, y;

	if (c == NULL)
		return;

	wp = cmd_mouse_pane(m, NULL, NULL);
	if (wp == NULL || wp->mode != &window_copy_mode)
		return;

	if (cmd_mouse_at(wp, m, &x, &y, 1) != 0)
		return;

	c->tty.mouse_drag_update = window_copy_drag_update;
	c->tty.mouse_drag_release = NULL; /* will fire MouseDragEnd key */

	window_copy_update_cursor(wp, x, y);
	window_copy_start_selection(wp);
	window_copy_redraw_screen(wp);
}

static void
window_copy_drag_update(__unused struct client *c, struct mouse_event *m)
{
	struct window_pane		*wp;
	struct window_copy_mode_data	*data;
	u_int				 x, y, old_cy;

	wp = cmd_mouse_pane(m, NULL, NULL);
	if (wp == NULL || wp->mode != &window_copy_mode)
		return;
	data = wp->modedata;

	if (cmd_mouse_at(wp, m, &x, &y, 0) != 0)
		return;
	old_cy = data->cy;

	window_copy_update_cursor(wp, x, y);
	if (window_copy_update_selection(wp, 1))
		window_copy_redraw_selection(wp, old_cy);
}