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author | Johannes Schindelin <johannes.schindelin@gmx.de> | 2020-01-14 18:43:51 +0000 |
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committer | Junio C Hamano <gitster@pobox.com> | 2020-01-15 12:06:17 -0800 |
commit | e118f06396bb298f2852070f648c6b4bb221a925 (patch) | |
tree | f63d338e86ac29a911e0447b5f46d08dba69062c /t/t0041-usage.sh | |
parent | built-in add -p: respect the `interactive.singlekey` config setting (diff) | |
download | tgif-e118f06396bb298f2852070f648c6b4bb221a925.tar.xz |
built-in add -p: handle Escape sequences in interactive.singlekey mode
This recapitulates part of b5cc003253c8 (add -i: ignore terminal escape
sequences, 2011-05-17):
add -i: ignore terminal escape sequences
On the author's terminal, the up-arrow input sequence is ^[[A, and
thus fat-fingering an up-arrow into 'git checkout -p' is quite
dangerous: git-add--interactive.perl will ignore the ^[ and [
characters and happily treat A as "discard everything".
As a band-aid fix, use Term::Cap to get all terminal capabilities.
Then use the heuristic that any capability value that starts with ^[
(i.e., \e in perl) must be a key input sequence. Finally, given an
input that starts with ^[, read more characters until we have read a
full escape sequence, then return that to the caller. We use a
timeout of 0.5 seconds on the subsequent reads to avoid getting stuck
if the user actually input a lone ^[.
Since none of the currently recognized keys start with ^[, the net
result is that the sequence as a whole will be ignored and the help
displayed.
Note that we leave part for later which uses "Term::Cap to get all
terminal capabilities", for several reasons:
1. it is actually not really necessary, as the timeout of 0.5 seconds
should be plenty sufficient to catch Escape sequences,
2. it is cleaner to keep the change to special-case Escape sequences
separate from the change that reads all terminal capabilities to
speed things up, and
3. in practice, relying on the terminal capabilities is a bit overrated,
as the information could be incomplete, or plain wrong. For example,
in this developer's tmux sessions, the terminal capabilities claim
that the "cursor up" sequence is ^[M, but the actual sequence
produced by the "cursor up" key is ^[[A.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 't/t0041-usage.sh')
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