Subject: [PATCH] add -p: fix 2.17.0-rc* regression due to moved code

From: Ævar Arnfjörð Bjarmason <[email-masked]>
Date: Sat, 31 Mar 2018 12:36:05 +0000

Fix a regression in 88f6ffc1c2 ("add -p: only bind search key if
there's more than one hunk", 2018-02-13) which is present in
2.17.0-rc*, but not 2.16.0.

In Perl regex variables like $1 always refer to the last regex
match. When the added a new regex match between the old match and the
code that was expecting its $1, the $1 variable would always become
undef.

As a result the "/" feature to search for a string in a hunk by regex
completely broke, on git.git:

    $ perl -pi -e 's/Git/Tig/g' README.md
    $ ./git --exec-path=$PWD add -p
    [..]
    Stage this hunk [y,n,q,a,d,j,J,g,/,s,e,?]? s
    Split into 4 hunks.
    [...]
    Stage this hunk [y,n,q,a,d,j,J,g,/,s,e,?]? /Many
    Use of uninitialized value $1 in string eq at /home/avar/g/git/git-add--interactive line 1568, <STDIN> line 1.
    search for regex? Many

I.e. the initial "/regex" command wouldn't work, and would always emit
a warning and ask again for a regex, now it works as intended again.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email-masked]>
---

Junio: You'll want this for 2.17.0 final. I didn't have time to add
tests for this, but looking over t3701-add-interactive.sh it seems
doable. Phillip: Maybe something you'd be interested in?

 git-add--interactive.perl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index d190469cd8..c1f52e457f 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -1564,7 +1564,7 @@ sub patch_update_file {
 					error_msg __("No other hunks to search\n");
 					next;
 				}
-				if ($1 eq "") {
+				if ($regex eq "") {
 					print colored $prompt_color, __("search for regex? ");
 					$regex = <STDIN>;
 					if (defined $regex) {
-- 
2.17.0.rc1.321.gba9d0f2565