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Break cursor movement in grid into a common set of functions that can

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handle line wrapping and so on in one place and use them for the obvious
copy mode commands. From Anindya Mukherjee.
This commit is contained in:
nicm 2020-12-22 09:22:14 +00:00
parent 8bd29a30bf
commit c43f2dce1b
4 changed files with 515 additions and 144 deletions
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4
Makefile
View File

@ -76,6 +76,7 @@ SRCS= alerts.c \
file.c \
format.c \
format-draw.c \
grid-reader.c \
grid-view.c \
grid.c \
input-keys.c \
@ -123,8 +124,7 @@ SRCS= alerts.c \
window-customize.c \
window-tree.c \
window.c \
xmalloc.c \
xterm-keys.c
xmalloc.c
CDIAGFLAGS+= -Wno-long-long -Wall -W -Wnested-externs -Wformat=2
CDIAGFLAGS+= -Wmissing-prototypes -Wstrict-prototypes -Wmissing-declarations

303
grid-reader.c Normal file
View File

@ -0,0 +1,303 @@
/* $OpenBSD$ */
/*
* Copyright (c) 2020 Anindya Mukherjee <anindya49@hotmail.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 "tmux.h"
/* Initialise virtual cursor. */
void
grid_reader_start(struct grid_reader *gr, struct grid *gd, u_int cx, u_int cy)
{
gr->gd = gd;
gr->cx = cx;
gr->cy = cy;
}
/* Get cursor position from reader. */
void
grid_reader_get_cursor(struct grid_reader *gr, u_int *cx, u_int *cy)
{
*cx = gr->cx;
*cy = gr->cy;
}
/* Get length of line containing the cursor. */
u_int
grid_reader_line_length(struct grid_reader *gr)
{
return (grid_line_length(gr->gd, gr->cy));
}
/* Move cursor forward one position. */
void
grid_reader_cursor_right(struct grid_reader *gr, int wrap, int all)
{
u_int px;
struct grid_cell gc;
if (all)
px = gr->gd->sx;
else
px = grid_reader_line_length(gr);
if (wrap && gr->cx >= px && gr->cy < gr->gd->hsize + gr->gd->sy - 1) {
grid_reader_cursor_start_of_line(gr, 0);
grid_reader_cursor_down(gr);
} else if (gr->cx < px) {
gr->cx++;
while (gr->cx < px) {
grid_get_cell(gr->gd, gr->cx, gr->cy, &gc);
if (~gc.flags & GRID_FLAG_PADDING)
break;
gr->cx++;
}
}
}
/* Move cursor back one position. */
void
grid_reader_cursor_left(struct grid_reader *gr)
{
struct grid_cell gc;
while (gr->cx > 0) {
grid_get_cell(gr->gd, gr->cx, gr->cy, &gc);
if (~gc.flags & GRID_FLAG_PADDING)
break;
gr->cx--;
}
if (gr->cx == 0 && gr->cy > 0) {
grid_reader_cursor_up(gr);
grid_reader_cursor_end_of_line(gr, 0, 0);
} else if (gr->cx > 0)
gr->cx--;
}
/* Move cursor down one line. */
void
grid_reader_cursor_down(struct grid_reader *gr)
{
struct grid_cell gc;
if (gr->cy < gr->gd->hsize + gr->gd->sy - 1)
gr->cy++;
while (gr->cx > 0) {
grid_get_cell(gr->gd, gr->cx, gr->cy, &gc);
if (~gc.flags & GRID_FLAG_PADDING)
break;
gr->cx--;
}
}
/* Move cursor up one line. */
void
grid_reader_cursor_up(struct grid_reader *gr)
{
struct grid_cell gc;
if (gr->cy > 0)
gr->cy--;
while (gr->cx > 0) {
grid_get_cell(gr->gd, gr->cx, gr->cy, &gc);
if (~gc.flags & GRID_FLAG_PADDING)
break;
gr->cx--;
}
}
/* Move cursor to the start of the line. */
void
grid_reader_cursor_start_of_line(struct grid_reader *gr, int wrap)
{
if (wrap) {
while (gr->cy > 0 &&
grid_get_line(gr->gd, gr->cy - 1)->flags &
GRID_LINE_WRAPPED)
gr->cy--;
}
gr->cx = 0;
}
/* Move cursor to the end of the line. */
void
grid_reader_cursor_end_of_line(struct grid_reader *gr, int wrap, int all)
{
u_int yy;
if (wrap) {
yy = gr->gd->hsize + gr->gd->sy - 1;
while (gr->cy < yy && grid_get_line(gr->gd, gr->cy)->flags &
GRID_LINE_WRAPPED)
gr->cy++;
}
if (all)
gr->cx = gr->gd->sx;
else
gr->cx = grid_reader_line_length(gr);
}
/* Check if character under cursor is in set. */
int
grid_reader_in_set(struct grid_reader *gr, const char *set)
{
struct grid_cell gc;
grid_get_cell(gr->gd, gr->cx, gr->cy, &gc);
if (gc.flags & GRID_FLAG_PADDING)
return (0);
return (utf8_cstrhas(set, &gc.data));
}
/* Move cursor to the start of the next word. */
void
grid_reader_cursor_next_word(struct grid_reader *gr, const char *separators)
{
u_int xx, yy;
int expected = 0;
/* Do not break up wrapped words. */
if (grid_get_line(gr->gd, gr->cy)->flags & GRID_LINE_WRAPPED)
xx = grid_reader_line_length(gr) - 1;
else
xx = grid_reader_line_length(gr);
yy = gr->gd->hsize + gr->gd->sy - 1;
/*
* If we started inside a word, skip over word characters. Then skip
* over separators till the next word.
*
* expected is initially set to 0 for the former and then 1 for the
* latter. It is finally set to 0 when the beginning of the next word is
* found.
*/
do {
while (gr->cx > xx ||
grid_reader_in_set(gr, separators) == expected) {
/* Move down if we are past the end of the line. */
if (gr->cx > xx) {
if (gr->cy == yy)
return;
grid_reader_cursor_start_of_line(gr, 0);
grid_reader_cursor_down(gr);
if (grid_get_line(gr->gd, gr->cy)->flags &
GRID_LINE_WRAPPED)
xx = grid_reader_line_length(gr) - 1;
else
xx = grid_reader_line_length(gr);
} else
gr->cx++;
}
expected = !expected;
} while (expected == 1);
}
/* Move cursor to the end of the next word. */
void
grid_reader_cursor_next_word_end(struct grid_reader *gr, const char *separators)
{
u_int xx, yy;
int expected = 1;
/* Do not break up wrapped words. */
if (grid_get_line(gr->gd, gr->cy)->flags & GRID_LINE_WRAPPED)
xx = grid_reader_line_length(gr) - 1;
else
xx = grid_reader_line_length(gr);
yy = gr->gd->hsize + gr->gd->sy - 1;
/*
* If we started on a separator, skip over separators. Then skip over
* word characters till the next separator.
*
* expected is initially set to 1 for the former and then 1 for the
* latter. It is finally set to 1 when the end of the next word is
* found.
*/
do {
while (gr->cx > xx ||
grid_reader_in_set(gr, separators) == expected) {
/* Move down if we are past the end of the line. */
if (gr->cx > xx) {
if (gr->cy == yy)
return;
grid_reader_cursor_start_of_line(gr, 0);
grid_reader_cursor_down(gr);
if (grid_get_line(gr->gd, gr->cy)->flags &
GRID_LINE_WRAPPED)
xx = grid_reader_line_length(gr) - 1;
else
xx = grid_reader_line_length(gr);
} else
gr->cx++;
}
expected = !expected;
} while (expected == 0);
}
/* Move to the previous place where a word begins. */
void
grid_reader_cursor_previous_word(struct grid_reader *gr, const char *separators,
int already)
{
int oldx, oldy, r;
/* Move back to the previous word character. */
if (already || grid_reader_in_set(gr, separators)) {
for (;;) {
if (gr->cx > 0) {
gr->cx--;
if (!grid_reader_in_set(gr, separators))
break;
} else {
if (gr->cy == 0)
return;
grid_reader_cursor_up(gr);
grid_reader_cursor_end_of_line(gr, 0, 0);
/* Stop if separator at EOL. */
if (gr->cx > 0) {
oldx = gr->cx;
gr->cx--;
r = grid_reader_in_set(gr, separators);
gr->cx = oldx;
if (r)
break;
}
}
}
}
/* Move back to the beginning of this word. */
do {
oldx = gr->cx;
oldy = gr->cy;
if (gr->cx == 0) {
if (gr->cy == 0 ||
~grid_get_line(gr->gd, gr->cy - 1)->flags &
GRID_LINE_WRAPPED)
break;
grid_reader_cursor_up(gr);
grid_reader_cursor_end_of_line(gr, 0, 0);
}
if (gr->cx > 0)
gr->cx--;
} while (!grid_reader_in_set(gr, separators));
gr->cx = oldx;
gr->cy = oldy;
}

23
tmux.h
View File

@ -726,6 +726,13 @@ struct grid {
struct grid_line *linedata;
};
/* Virtual cursor in a grid. */
struct grid_reader {
struct grid *gd;
u_int cx;
u_int cy;
};
/* Style alignment. */
enum style_align {
STYLE_ALIGN_DEFAULT,
@ -2548,6 +2555,22 @@ void grid_wrap_position(struct grid *, u_int, u_int, u_int *, u_int *);
void grid_unwrap_position(struct grid *, u_int *, u_int *, u_int, u_int);
u_int grid_line_length(struct grid *, u_int);
/* grid-reader.c */
void grid_reader_start(struct grid_reader *, struct grid *, u_int, u_int);
void grid_reader_get_cursor(struct grid_reader *, u_int *, u_int *);
u_int grid_reader_line_length(struct grid_reader *);
int grid_reader_in_set(struct grid_reader *, const char *);
void grid_reader_cursor_right(struct grid_reader *, int, int);
void grid_reader_cursor_left(struct grid_reader *);
void grid_reader_cursor_down(struct grid_reader *);
void grid_reader_cursor_up(struct grid_reader *);
void grid_reader_cursor_start_of_line(struct grid_reader *, int);
void grid_reader_cursor_end_of_line(struct grid_reader *, int, int);
void grid_reader_cursor_next_word(struct grid_reader *, const char *);
void grid_reader_cursor_next_word_end(struct grid_reader *, const char *);
void grid_reader_cursor_previous_word(struct grid_reader *, const char *,
int);
/* grid-view.c */
void grid_view_get_cell(struct grid *, u_int, u_int, struct grid_cell *);
void grid_view_set_cell(struct grid *, u_int, u_int,

329
window-copy.c
View File

@ -3993,18 +3993,31 @@ window_copy_cursor_start_of_line(struct window_mode_entry *wme)
{
struct window_copy_mode_data *data = wme->data;
struct screen *back_s = data->backing;
struct grid *gd = back_s->grid;
u_int py;
struct grid_reader gr;
u_int px, py, cy, yy, ny, hsize;
if (data->cx == 0 && data->lineflag == LINE_SEL_NONE) {
py = screen_hsize(back_s) + data->cy - data->oy;
while (py > 0 &&
grid_get_line(gd, py - 1)->flags & GRID_LINE_WRAPPED) {
window_copy_cursor_up(wme, 0);
py = screen_hsize(back_s) + data->cy - data->oy;
}
px = data->cx;
hsize = screen_hsize(back_s);
py = hsize + data->cy - data->oy;
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_cursor_start_of_line(&gr, 1);
grid_reader_get_cursor(&gr, &px, &py);
/* Scroll up if we went off the visible screen. */
yy = hsize - data->oy;
if (py < yy) {
ny = yy - py;
cy = 0;
} else {
ny = 0;
cy = py - yy;
}
window_copy_update_cursor(wme, 0, data->cy);
while (ny > 0) {
window_copy_cursor_up(wme, 1);
ny--;
}
window_copy_update_cursor(wme, px, cy);
if (window_copy_update_selection(wme, 1, 0))
window_copy_redraw_lines(wme, data->cy, 1);
}
@ -4037,30 +4050,35 @@ window_copy_cursor_end_of_line(struct window_mode_entry *wme)
{
struct window_copy_mode_data *data = wme->data;
struct screen *back_s = data->backing;
struct grid *gd = back_s->grid;
struct grid_line *gl;
u_int px, py;
struct grid_reader gr;
u_int px, py, cy, yy, ny, hsize;
py = screen_hsize(back_s) + data->cy - data->oy;
px = window_copy_find_length(wme, py);
px = data->cx;
hsize = screen_hsize(back_s);
py = hsize + data->cy - data->oy;
if (data->cx == px && data->lineflag == LINE_SEL_NONE) {
if (data->screen.sel != NULL && data->rectflag)
px = screen_size_x(back_s);
gl = grid_get_line(gd, py);
if (gl->flags & GRID_LINE_WRAPPED) {
while (py < gd->sy + gd->hsize) {
gl = grid_get_line(gd, py);
if (~gl->flags & GRID_LINE_WRAPPED)
break;
window_copy_cursor_down(wme, 0);
py = screen_hsize(back_s) + data->cy - data->oy;
}
px = window_copy_find_length(wme, py);
}
grid_reader_start(&gr, back_s->grid, px, py);
if (data->screen.sel != NULL && data->rectflag)
grid_reader_cursor_end_of_line(&gr, 1, 1);
else
grid_reader_cursor_end_of_line(&gr, 1, 0);
grid_reader_get_cursor(&gr, &px, &py);
/* Scroll down if we went off the visible screen. */
cy = py - hsize + data->oy;
yy = screen_size_y(back_s) - 1;
if (cy > yy)
ny = cy - yy;
else
ny = 0;
while (ny > 0) {
window_copy_cursor_down(wme, 1);
ny--;
}
window_copy_update_cursor(wme, px, data->cy);
if (cy > yy)
window_copy_update_cursor(wme, px, yy);
else
window_copy_update_cursor(wme, px, cy);
if (window_copy_update_selection(wme, 1, 0))
window_copy_redraw_lines(wme, data->cy, 1);
}
@ -4120,57 +4138,69 @@ static void
window_copy_cursor_left(struct window_mode_entry *wme)
{
struct window_copy_mode_data *data = wme->data;
u_int py, cx;
struct grid_cell gc;
struct screen *back_s = data->backing;
struct grid_reader gr;
u_int px, py, cy, yy, ny, hsize;
py = screen_hsize(data->backing) + data->cy - data->oy;
cx = data->cx;
while (cx > 0) {
grid_get_cell(data->backing->grid, cx, py, &gc);
if (~gc.flags & GRID_FLAG_PADDING)
break;
cx--;
px = data->cx;
hsize = screen_hsize(back_s);
py = hsize + data->cy - data->oy;
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_cursor_left(&gr);
grid_reader_get_cursor(&gr, &px, &py);
/* Scroll up if we went off the visible screen. */
yy = hsize - data->oy;
if (py < yy) {
ny = yy - py;
cy = 0;
} else {
ny = 0;
cy = py - yy;
}
if (cx == 0 && py > 0) {
window_copy_cursor_up(wme, 0);
window_copy_cursor_end_of_line(wme);
} else if (cx > 0) {
window_copy_update_cursor(wme, cx - 1, data->cy);
if (window_copy_update_selection(wme, 1, 0))
window_copy_redraw_lines(wme, data->cy, 1);
while (ny > 0) {
window_copy_cursor_up(wme, 1);
ny--;
}
window_copy_update_cursor(wme, px, cy);
if (window_copy_update_selection(wme, 1, 0))
window_copy_redraw_lines(wme, data->cy, 1);
}
static void
window_copy_cursor_right(struct window_mode_entry *wme, int all)
{
struct window_copy_mode_data *data = wme->data;
u_int px, py, yy, cx, cy;
struct grid_cell gc;
struct screen *back_s = data->backing;
struct grid_reader gr;
u_int px, py, cy, yy, ny, hsize;
py = screen_hsize(data->backing) + data->cy - data->oy;
yy = screen_hsize(data->backing) + screen_size_y(data->backing) - 1;
if (all || (data->screen.sel != NULL && data->rectflag))
px = screen_size_x(&data->screen);
px = data->cx;
hsize = screen_hsize(back_s);
py = hsize + data->cy - data->oy;
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_cursor_right(&gr, 1, all);
grid_reader_get_cursor(&gr, &px, &py);
/* Scroll down if we went off the visible screen. */
cy = py - hsize + data->oy;
yy = screen_size_y(back_s) - 1;
if (cy > yy)
ny = cy - yy;
else
px = window_copy_find_length(wme, py);
if (data->cx >= px && py < yy) {
window_copy_cursor_start_of_line(wme);
window_copy_cursor_down(wme, 0);
} else if (data->cx < px) {
cx = data->cx + 1;
cy = screen_hsize(data->backing) + data->cy - data->oy;
while (cx < px) {
grid_get_cell(data->backing->grid, cx, cy, &gc);
if (~gc.flags & GRID_FLAG_PADDING)
break;
cx++;
}
window_copy_update_cursor(wme, cx, data->cy);
if (window_copy_update_selection(wme, 1, 0))
window_copy_redraw_lines(wme, data->cy, 1);
ny = 0;
while (ny > 0) {
window_copy_cursor_down(wme, 1);
ny--;
}
if (cy > yy)
window_copy_update_cursor(wme, px, yy);
else
window_copy_update_cursor(wme, px, cy);
if (window_copy_update_selection(wme, 1, 0))
window_copy_redraw_lines(wme, data->cy, 1);
}
static void
@ -4214,13 +4244,30 @@ window_copy_cursor_up(struct window_mode_entry *wme, int scroll_only)
px = window_copy_find_length(wme, py);
if ((data->cx >= data->lastsx && data->cx != px) ||
data->cx > px)
window_copy_cursor_end_of_line(wme);
{
window_copy_update_cursor(wme, px, data->cy);
if (window_copy_update_selection(wme, 1, 0))
window_copy_redraw_lines(wme, data->cy, 1);
}
}
if (data->lineflag == LINE_SEL_LEFT_RIGHT)
window_copy_cursor_end_of_line(wme);
{
py = screen_hsize(data->backing) + data->cy - data->oy;
if (data->rectflag)
px = screen_size_x(data->backing);
else
px = window_copy_find_length(wme, py);
window_copy_update_cursor(wme, px, data->cy);
if (window_copy_update_selection(wme, 1, 0))
window_copy_redraw_lines(wme, data->cy, 1);
}
else if (data->lineflag == LINE_SEL_RIGHT_LEFT)
window_copy_cursor_start_of_line(wme);
{
window_copy_update_cursor(wme, 0, data->cy);
if (window_copy_update_selection(wme, 1, 0))
window_copy_redraw_lines(wme, data->cy, 1);
}
}
static void
@ -4256,13 +4303,30 @@ window_copy_cursor_down(struct window_mode_entry *wme, int scroll_only)
px = window_copy_find_length(wme, py);
if ((data->cx >= data->lastsx && data->cx != px) ||
data->cx > px)
window_copy_cursor_end_of_line(wme);
{
window_copy_update_cursor(wme, px, data->cy);
if (window_copy_update_selection(wme, 1, 0))
window_copy_redraw_lines(wme, data->cy, 1);
}
}
if (data->lineflag == LINE_SEL_LEFT_RIGHT)
window_copy_cursor_end_of_line(wme);
{
py = screen_hsize(data->backing) + data->cy - data->oy;
if (data->rectflag)
px = screen_size_x(data->backing);
else
px = window_copy_find_length(wme, py);
window_copy_update_cursor(wme, px, data->cy);
if (window_copy_update_selection(wme, 1, 0))
window_copy_redraw_lines(wme, data->cy, 1);
}
else if (data->lineflag == LINE_SEL_RIGHT_LEFT)
window_copy_cursor_start_of_line(wme);
{
window_copy_update_cursor(wme, 0, data->cy);
if (window_copy_update_selection(wme, 1, 0))
window_copy_redraw_lines(wme, data->cy, 1);
}
}
static void
@ -4476,46 +4540,38 @@ window_copy_cursor_next_word_end(struct window_mode_entry *wme,
struct window_copy_mode_data *data = wme->data;
struct options *oo = wp->window->options;
struct screen *back_s = data->backing;
u_int px, py, xx, yy;
int keys, expected = 1;
struct grid_reader gr;
u_int px, py, cy, yy, ny, hsize;
int keys;
px = data->cx;
py = screen_hsize(back_s) + data->cy - data->oy;
xx = window_copy_find_length(wme, py);
yy = screen_hsize(back_s) + screen_size_y(back_s) - 1;
hsize = screen_hsize(back_s);
py = hsize + data->cy - data->oy;
grid_reader_start(&gr, back_s->grid, px, py);
keys = options_get_number(oo, "mode-keys");
if (keys == MODEKEY_VI && !window_copy_in_set(wme, px, py, separators))
px++;
if (keys == MODEKEY_VI && !grid_reader_in_set(&gr, separators))
grid_reader_cursor_right(&gr, 0, 0);
grid_reader_cursor_next_word_end(&gr, separators);
if (keys == MODEKEY_VI)
grid_reader_cursor_left(&gr);
grid_reader_get_cursor(&gr, &px, &py);
/*
* 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(wme, 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(wme, 0);
px = 0;
py = screen_hsize(back_s) + data->cy - data->oy;
xx = window_copy_find_length(wme, py);
} else
px++;
}
expected = !expected;
} while (expected == 0);
if (keys == MODEKEY_VI && px != 0)
px--;
window_copy_update_cursor(wme, px, data->cy);
/* Scroll down if we went off the visible screen. */
cy = py - hsize + data->oy;
yy = screen_size_y(back_s) - 1;
if (cy > yy)
ny = cy - yy;
else
ny = 0;
while (ny > 0) {
window_copy_cursor_down(wme, 1);
ny--;
}
if (cy > yy)
window_copy_update_cursor(wme, px, yy);
else
window_copy_update_cursor(wme, px, cy);
if (window_copy_update_selection(wme, 1, no_reset))
window_copy_redraw_lines(wme, data->cy, 1);
}
@ -4572,43 +4628,32 @@ window_copy_cursor_previous_word(struct window_mode_entry *wme,
const char *separators, int already)
{
struct window_copy_mode_data *data = wme->data;
u_int px, py, hsize;
struct screen *back_s = data->backing;
struct grid_reader gr;
u_int px, py, cy, yy, ny, hsize;
hsize = screen_hsize(data->backing);
px = data->cx;
hsize = screen_hsize(back_s);
py = hsize + data->cy - data->oy;
/* Move back to the previous word character. */
if (already || window_copy_in_set(wme, px, py, separators)) {
for (;;) {
if (px > 0) {
px--;
if (!window_copy_in_set(wme, px, py,
separators))
break;
} else {
if (data->cy == 0 &&
(hsize == 0 || data->oy > hsize - 1))
goto out;
window_copy_cursor_up(wme, 0);
grid_reader_start(&gr, back_s->grid, px, py);
grid_reader_cursor_previous_word(&gr, separators, already);
grid_reader_get_cursor(&gr, &px, &py);
py = hsize + data->cy - data->oy;
px = window_copy_find_length(wme, py);
/* Stop if separator at EOL. */
if (px > 0 && window_copy_in_set(wme, px - 1,
py, separators))
break;
}
}
/* Scroll up if we went off the visible screen. */
yy = hsize - data->oy;
if (py < yy) {
ny = yy - py;
cy = 0;
} else {
ny = 0;
cy = py - yy;
}
/* Move back to the beginning of this word. */
while (px > 0 && !window_copy_in_set(wme, px - 1, py, separators))
px--;
out:
window_copy_update_cursor(wme, px, data->cy);
while (ny > 0) {
window_copy_cursor_up(wme, 1);
ny--;
}
window_copy_update_cursor(wme, px, cy);
if (window_copy_update_selection(wme, 1, 0))
window_copy_redraw_lines(wme, data->cy, 1);
}