[PATCH 1/3] add -p: only display help for active keys

[Phillip Wood <phillip.wood@talktalk.net>]

From: Phillip Wood <phillip.wood@dunelm.org.uk>

If the user presses a key that add -p wasn't expecting then it prints
a list of key bindings. Although the prompt only lists the active
bindings the help was printed for all bindings.  Fix this by using the
list of keys in the prompt to filter the help. Note that the list of
keys was already passed to help_patch_cmd() by the caller so there is
no change needed to the call site.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
---
 git-add--interactive.perl | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index 964c3a75420db4751cf11125b68b6904112632f1..76b941f8f0071b7bfa9d515af25b69997ef4581a 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -1184,7 +1184,13 @@ d - do not apply this hunk or any of the later hunks in the file"),
 );
 
 sub help_patch_cmd {
-	print colored $help_color, __($help_patch_modes{$patch_mode}), "\n", __ <<EOF ;
+	local $_;
+	my $other = $_[0] . ",/,?";
+	print colored $help_color, __($help_patch_modes{$patch_mode}), "\n",
+		map { "$_\n" } grep {
+			my $c = quotemeta(substr($_, 0, 1));
+			$other =~ /,$c/
+		} split "\n", __ <<EOF ;
 g - select a hunk to go to
 / - search for a hunk matching the given regex
 j - leave this hunk undecided, see next undecided hunk
-- 
2.16.1