[PATCH 2/2] completion: add case-insensitive match of pseudorefs

["Alison Winters via GitGitGadget" <gitgitgadget@xxxxxxxxx>]

From: Alison Winters <alisonatwork@xxxxxxxxxxx>

When GIT_COMPLETION_IGNORE_CASE=1, also allow lowercase completion text
like "head" to match HEAD and other pseudorefs.

Signed-off-by: Alison Winters <alisonatwork@xxxxxxxxxxx>
---
 contrib/completion/git-completion.bash | 10 +++++++---
 t/t9902-completion.sh                  | 16 ++++++++++++++++
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 8ed96a5b8b6..161327057da 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -745,6 +745,7 @@ __git_refs ()
 	local format refs
 	local pfx="${3-}" cur_="${4-$cur}" sfx="${5-}"
 	local match="${4-}"
+	local umatch="${4-}"
 	local fer_pfx="${pfx//\%/%%}" # "escape" for-each-ref format specifiers
 	local ignore_case=""
 
@@ -772,6 +773,8 @@ __git_refs ()
 	if test "${GIT_COMPLETION_IGNORE_CASE-}" = "1"
 	then
 		ignore_case="--ignore-case"
+		# use tr instead of ${match,^^} to preserve bash 3.2 compatibility
+		umatch=$(echo "$match" | tr a-z A-Z 2> /dev/null || echo "$match")
 	fi
 
 	if [ "$list_refs_from" = path ]; then
@@ -780,6 +783,7 @@ __git_refs ()
 			fer_pfx="$fer_pfx^"
 			cur_=${cur_#^}
 			match=${match#^}
+			umatch=${umatch#^}
 		fi
 		case "$cur_" in
 		refs|refs/*)
@@ -790,7 +794,7 @@ __git_refs ()
 		*)
 			for i in HEAD FETCH_HEAD ORIG_HEAD MERGE_HEAD REBASE_HEAD CHERRY_PICK_HEAD; do
 				case "$i" in
-				$match*)
+				$match*|$umatch*)
 					if [ -e "$dir/$i" ]; then
 						echo "$pfx$i$sfx"
 					fi
@@ -824,7 +828,7 @@ __git_refs ()
 	*)
 		if [ "$list_refs_from" = remote ]; then
 			case "HEAD" in
-			$match*)	echo "${pfx}HEAD$sfx" ;;
+			$match*|$umatch*)	echo "${pfx}HEAD$sfx" ;;
 			esac
 			__git for-each-ref --format="$fer_pfx%(refname:strip=3)$sfx" \
 				$ignore_case \
@@ -833,7 +837,7 @@ __git_refs ()
 		else
 			local query_symref
 			case "HEAD" in
-			$match*)	query_symref="HEAD" ;;
+			$match*|$umatch*)	query_symref="HEAD" ;;
 			esac
 			__git ls-remote "$remote" $query_symref \
 				"refs/tags/$match*" "refs/heads/$match*" \
diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index f62a395d827..b4c46567fa4 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -2271,6 +2271,22 @@ test_expect_success 'checkout matches case insensitively with GIT_COMPLETION_IGN
 	)
 '
 
+test_expect_success 'checkout completes pseudo refs' '
+	test_completion "git checkout H" <<-\EOF
+	HEAD Z
+	EOF
+'
+
+test_expect_success 'checkout completes pseudo refs case insensitively with GIT_COMPLETION_IGNORE_CASE' '
+	(
+		. "$GIT_BUILD_DIR/contrib/completion/git-completion.bash" &&
+		GIT_COMPLETION_IGNORE_CASE=1 && export GIT_COMPLETION_IGNORE_CASE &&
+		test_completion "git checkout h" <<-\EOF
+		HEAD Z
+		EOF
+	)
+'
+
 test_expect_success 'git -C <path> checkout uses the right repo' '
 	test_completion "git -C subdir -C subsubdir -C .. -C ../otherrepo checkout b" <<-\EOF
 	branch-in-other Z
-- 
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