contrib/subtree: convert subtree type check to use case statement

The `subtree_for_commit ()` helper function asserts that the subtree identified by its parameters are either a commit or tree. This is done via the `-o` parameter of test, which is discouraged. Refactor the code to instead use a switch statement over the type. Despite being aligned with our coding guidelines, the resulting code is arguably also easier to read. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Patrick Steinhardt committed Nov 10, 2023 at 11:01 UTC 47c39c28bc1a0001e4341ae70629adcb10f425cc
1 file changed +10 -4
contrib/subtree/git-subtree.sh
+10 -4
@@ -641,10 +641,16 @@ subtree_for_commit () {
641 while read mode type tree name
642 do
643 assert test "$name" = "$dir"
644 - assert test "$type" = "tree" -o "$type" = "commit"
645 - test "$type" = "commit" && continue # ignore submodules
646 - echo $tree
647 - break
644 +
645 + case "$type" in
646 + commit)
647 + continue;; # ignore submodules
648 + tree)
649 + echo $tree
650 + break;;
651 + *)
652 + die "fatal: tree entry is of type ${type}, expected tree or commit";;
653 + esac
654 done || exit $?
655 }
656