[PATCH v2 3/4] completion: complete 'git history --update-refs' values

The "--update-refs" option accepts either "branches" or "head".
Complete these values.

Although the synopsis only documents the:

  --update-refs=<value>

form, parse-options also accepts the value as a separate argument:

  --update-refs <value>

Support both forms to follow the parser.

Signed-off-by: Vincent Mailhol <[email protected]>
---
Changes in v2:

  - New patch.
---
 contrib/completion/git-completion.bash | 5 +++++
 t/t9902-completion.sh                  | 6 +++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index fe5223b8ec..6f1ba96763 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2181,6 +2181,11 @@ _git_history ()
 				;;
 			esac
 			;;
+		--update-refs,*|*,--update-refs=*)
+			__gitcomp "branches head" "" \
+				"${cur##--update-refs=}"
+			return
+			;;
 		*,--*)
 			__gitcomp_builtin "history_$subcommand"
 			return
diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index 52a036a1ad..ea86ecc08f 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -3129,7 +3129,11 @@ test_expect_success 'git history subcommand options' '
 	test_completion "git history reword main -- --d" "" &&
 	test_completion "git history fixup --empty=ke" "keep " &&
 	test_completion "git history drop --empty ab" "abort " &&
-	test_completion "git history reword --empty=ke" ""
+	test_completion "git history reword --empty=ke" "" &&
+	test_completion "git history fixup --update-refs=he" "head " &&
+	test_completion "git history split --update-refs he" "head " &&
+	test_completion "git history reword main -- --update-refs=he" "" &&
+	test_completion "git history reword main -- --update-refs he" ""
 '
 
 test_expect_success 'git history revisions' '

-- 
2.54.0