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search: don't modify search.start coord *before* finding next match

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The match logic uses the last start coordinate to determine which end
points in the selection to update. This sometimes fails when the start
coordinate has been changed by e.g. a key binding - the new start
coordinate is incorrectly matched against the old-but-modified start
coordinate, causing foot to e.g. *not* upate the selection start
coordinate.

Example:

  $ echo 'test\n\test\ntest'

Then do a scrollback search for 'test. The first match is found
correctly (the last 'test'), but searching for the previous match
(ctrl+r) does not select the middle 'test'.

Fix by passing the search direction to search_find_next(), and have
_it_ calculate the coordinate to start search. There are three possibilities:

* forward
* backward
* "backward", but at the same position

The first two are used when searching for next/prev match with ctrl+s
and ctrl+r. The last one is used when the search criteria is
updated. In this case, we don't want to move to the previous match,
*unless* the current match no longer matches.
This commit is contained in:
Daniel Eklöf 2022-04-21 18:54:27 +02:00
parent dd03e10c6c
commit 9907d7bbe9
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GPG key ID: 5BBD4992C116573F
3 changed files with 73 additions and 55 deletions
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terminal.h
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@ -263,7 +263,7 @@ enum selection_kind {
};
enum selection_direction {SELECTION_UNDIR, SELECTION_LEFT, SELECTION_RIGHT};
enum selection_scroll_direction {SELECTION_SCROLL_NOT, SELECTION_SCROLL_UP, SELECTION_SCROLL_DOWN};
enum search_direction { SEARCH_BACKWARD, SEARCH_FORWARD};
enum search_direction { SEARCH_BACKWARD_SAME_POSITION, SEARCH_BACKWARD, SEARCH_FORWARD };
struct ptmx_buffer {
void *data;
@ -503,7 +503,6 @@ struct terminal {
size_t len;
size_t sz;
size_t cursor;
enum search_direction direction;
int original_view;
bool view_followed_offset;