[PATCH v3 3/4] completion: complete 'git history --update-refs' values

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

  --update-refs=<value>

form.

While parse-options also accepts the split

  --update-refs <value>

form, it is not documented. Omit it from completion as a trade-off for
code simplicity.

Signed-off-by: Vincent Mailhol <[email protected]>
---
Changes in v3:

  - Complete only the documented stuck form.

Changes in v2:

  - New patch.
---
 contrib/completion/git-completion.bash | 5 +++++
 t/t9902-completion.sh                  | 5 ++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 7f3cabd595..19600940dc 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2178,6 +2178,11 @@ _git_history ()
 			esac
 			return
 			;;
+		--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 851be383e1..b225dd3800 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -3131,7 +3131,10 @@ test_expect_success 'git history subcommand options' '
 	test_completion "git history fixup --empty=ke" "keep " &&
 	test_completion "git history fixup --empty=drop" "drop " &&
 	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=branch" "branches " &&
+	test_completion "git history split --update-refs=he" "head " &&
+	test_completion "git history reword main -- --update-refs=he" ""
 '
 
 test_expect_success 'git history revisions' '

-- 
2.54.0