completion: address sparse-checkout issues

Correct multiple issues with tab completion of the git sparse-checkout
command. These issues were:

1. git sparse-checkout <TAB> previously resulted in an incomplete list of
subcommands (it was missing reapply and add).
2. Subcommand options were not tab-completable.
3. git sparse-checkout set <TAB> and git sparse-checkout add <TAB> showed
both file names and directory names. While this may be a less surprising
behavior for non-cone mode, cone mode sparse checkouts should complete
only directory names.

Note that while the new strategy of just using git ls-tree to complete on
directory names is simple and a step in the right direction, it does have
some caveats. These are:

1. Likelihood of poor performance in large monorepos (as a result of
recursively completing directory names).
2. Inability to handle paths containing unusual characters.

These caveats will be fixed by subsequent commits in this series.

Signed-off-by: Lessley Dennington <lessleydennington@gmail.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 83 insertions, 0 deletions

diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index 98c6280632..3b287d72dc 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -1444,6 +1444,89 @@ test_expect_success 'git checkout - with --detach, complete only references' '
 	EOF
 '
 
+test_expect_success 'setup sparse-checkout tests' '
+	# set up sparse-checkout repo
+	git init sparse-checkout &&
+	(
+		cd sparse-checkout &&
+		mkdir -p folder1/0/1 folder2/0 folder3 &&
+		touch folder1/0/1/t.txt &&
+		touch folder2/0/t.txt &&
+		touch folder3/t.txt &&
+		git add . &&
+		git commit -am "Initial commit"
+	)
+'
+
+test_expect_success 'sparse-checkout completes subcommands' '
+	test_completion "git sparse-checkout " <<-\EOF
+	list Z
+	init Z
+	set Z
+	add Z
+	reapply Z
+	disable Z
+	EOF
+'
+
+test_expect_success 'cone mode sparse-checkout completes directory names' '
+	# initialize sparse-checkout definitions
+	git -C sparse-checkout sparse-checkout set --cone folder1/0 folder3 &&
+
+	# test tab completion
+	(
+		cd sparse-checkout &&
+		test_completion "git sparse-checkout set f" <<-\EOF
+		folder1 Z
+		folder1/0 Z
+		folder1/0/1 Z
+		folder2 Z
+		folder2/0 Z
+		folder3 Z
+		EOF
+	) &&
+
+	(
+		cd sparse-checkout/folder1 &&
+		test_completion "git sparse-checkout add " <<-\EOF
+		./ Z
+		0 Z
+		0/1 Z
+		EOF
+	)
+'
+
+test_expect_success 'non-cone mode sparse-checkout uses bash completion' '
+	# reset sparse-checkout repo to non-cone mode
+	git -C sparse-checkout sparse-checkout disable &&
+	git -C sparse-checkout sparse-checkout set --no-cone &&
+
+	(
+		cd sparse-checkout &&
+		# expected to be empty since we have not configured
+		# custom completion for non-cone mode
+		test_completion "git sparse-checkout set f" <<-\EOF
+
+		EOF
+	)
+'
+
+test_expect_success 'git sparse-checkout set --cone completes directory names' '
+	git -C sparse-checkout sparse-checkout disable &&
+
+	(
+		cd sparse-checkout &&
+		test_completion "git sparse-checkout set --cone f" <<-\EOF
+		folder1 Z
+		folder1/0 Z
+		folder1/0/1 Z
+		folder2 Z
+		folder2/0 Z
+		folder3 Z
+		EOF
+	)
+'
+
 test_expect_success 'git switch - with -d, complete all references' '
 	test_completion "git switch -d " <<-\EOF
 	HEAD Z