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softwrap: improve Left and Right's behavior with softwrapped chunks

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Use the new "unclever" functionality of Home and End to make do_left()
and do_right() move properly to the end of the previous chunk or to the
start of the next chunk in softwrap mode when crossing a line boundary.
(Furthermore, doing Up plus End, or Down plus Home, does all needed
screen updates, which simplifies the code.)

The do_left() and do_right() functions don't yet properly move vertically
at line boundaries, but that will be fixed once do_up() and do_down() are
updated for softwrap mode, which is forthcoming.

This fixes https://savannah.gnu.org/bugs/?49384.
This commit is contained in:
David Lawrence Ramsey 2017-01-20 10:34:45 -06:00 committed by Benno Schulenberg
parent a5e106d764
commit 56402e7589
1 changed files with 37 additions and 11 deletions
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48
src/move.c
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@ -592,17 +592,34 @@ void do_scroll_down(void)
void do_left(void)
{
size_t was_column = xplustabs();
#ifndef NANO_TINY
size_t was_chunk = (was_column / editwincols);
filestruct *was_current = openfile->current;
#endif
if (openfile->current_x > 0)
openfile->current_x = move_mbleft(openfile->current->data,
openfile->current_x);
else if (openfile->current != openfile->fileage) {
do_up_void();
openfile->current_x = strlen(openfile->current->data);
do_end(FALSE);
return;
}
openfile->placewewant = xplustabs();
#ifndef NANO_TINY
/* If we were on the first line of the edit window, and we changed chunk,
* we're now above the first line of the edit window, so scroll up. */
if (ISSET(SOFTWRAP) && openfile->current_y == 0 &&
openfile->current == was_current &&
(openfile->placewewant / editwincols) != was_chunk) {
edit_scroll(UPWARD, ISSET(SMOOTH_SCROLL) ? 1 : editwinrows / 2 + 1);
return;
}
#endif
/* Update current if the mark is on or it has changed "page". */
if (line_needs_update(was_column, openfile->placewewant))
update_line(openfile->current, openfile->current_x);
}
@ -611,25 +628,34 @@ void do_left(void)
void do_right(void)
{
size_t was_column = xplustabs();
#ifndef NANO_TINY
size_t was_chunk = (was_column / editwincols);
filestruct *was_current = openfile->current;
#endif
if (openfile->current->data[openfile->current_x] != '\0')
openfile->current_x = move_mbright(openfile->current->data,
openfile->current_x);
else if (openfile->current != openfile->filebot) {
openfile->current_x = 0;
#ifndef NANO_TINY
if (ISSET(SOFTWRAP))
openfile->current_y -= strlenpt(openfile->current->data) / editwincols;
#endif
do_home(FALSE);
do_down_void();
return;
}
openfile->placewewant = xplustabs();
#ifndef NANO_TINY
/* If we were on the last line of the edit window, and we changed chunk,
* we're now below the first line of the edit window, so scroll down. */
if (ISSET(SOFTWRAP) && openfile->current_y == editwinrows - 1 &&
openfile->current == was_current &&
openfile->placewewant / editwincols != was_chunk) {
edit_scroll(DOWNWARD, ISSET(SMOOTH_SCROLL) ? 1 : editwinrows / 2 + 1);
return;
}
#endif
/* Update current if the mark is on or it has changed "page". */
if (line_needs_update(was_column, openfile->placewewant))
update_line(openfile->current, openfile->current_x);
if (openfile->current_x == 0)
do_down_void();
else
ensure_line_is_visible();
}