[PATCH v5 10/10] add--interactive.perl: use add--helper --show-help for help_cmd

["Slavica Djukic via GitGitGadget" <gitgitgadget@gmail.com>]

From: Slavica Djukic <slawica92@hotmail.com>

Change help_cmd sub in git-add--interactive.perl to use
show-help command from builtin add--helper.

If an error occurs, it will be reported, but the Perl script will
not exit, since the add--helper is called within an eval block.

Just like the change where the Perl script calls the add--helper
to print the numstat, also here we forgo adding a regression test:
the Perl script is on its way out (and this patch is part of that journey).

Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 git-add--interactive.perl | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index c2c6b4d5e3..88b7be6602 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -1718,16 +1718,8 @@ sub quit_cmd {
 }
 
 sub help_cmd {
-# TRANSLATORS: please do not translate the command names
-# 'status', 'update', 'revert', etc.
-	print colored $help_color, __ <<'EOF' ;
-status        - show paths with changes
-update        - add working tree state to the staged set of changes
-revert        - revert staged set of changes back to the HEAD version
-patch         - pick hunks and update selectively
-diff          - view diff between HEAD and index
-add untracked - add contents of untracked files to the staged set of changes
-EOF
+	my @help_cmd = ("git", "add--helper", "--show-help");
+	!system(@help_cmd) or die "@help_cmd exited with code $?";
 }
 
 sub process_args {
-- 
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