Re: [PATCH v5 1/3] completion: address sparse-checkout issues

[Elijah Newren <newren@gmail.com>]

On Thu, Feb 3, 2022 at 12:44 PM Lessley Dennington via GitGitGadget
<gitgitgadget@gmail.com> wrote:
>
> From: Lessley Dennington <lessleydennington@gmail.com>
>
> 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>
> ---
>  contrib/completion/git-completion.bash | 16 ++---
>  t/t9902-completion.sh                  | 83 ++++++++++++++++++++++++++
>  2 files changed, 91 insertions(+), 8 deletions(-)
>
> diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
> index c82ccaebcc7..2976f63747f 100644
> --- a/contrib/completion/git-completion.bash
> +++ b/contrib/completion/git-completion.bash
> @@ -2988,7 +2988,7 @@ _git_show_branch ()
>
>  _git_sparse_checkout ()
>  {
> -       local subcommands="list init set disable"
> +       local subcommands="list init set disable add reapply"
>         local subcommand="$(__git_find_on_cmdline "$subcommands")"
>         if [ -z "$subcommand" ]; then
>                 __gitcomp "$subcommands"
> @@ -2996,14 +2996,14 @@ _git_sparse_checkout ()
>         fi
>
>         case "$subcommand,$cur" in
> -       init,--*)
> -               __gitcomp "--cone"
> -               ;;
> -       set,--*)
> -               __gitcomp "--stdin"
> -               ;;
> -       *)
> +       *,--*)
> +               __gitcomp_builtin sparse-checkout_$subcommand "" "--"
>                 ;;
> +       set,*|add,*)
> +               if [ $(__git config core.sparseCheckoutCone) ] ||

Shouldn't this be

                 if [ "$(__git config core.sparseCheckoutCone)" == "true" ] ||

otherwise I think you'd trigger when it's manually set to false.

> +               [ "$(__git_find_on_cmdline --cone)" ]; then

This might read better as

                [ -n "$(__git_find_on_cmdline --cone)" ]; then

because otherwise you are relying on

     [ "--cone" ]

to evaluate as true which just seems slightly weird.

> +                       __gitcomp "$(git ls-tree -d -r HEAD --name-only)"
> +               fi
>         esac
>  }
>
> diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
> index 518203fbe07..f6eeb9aa035 100755
> --- a/t/t9902-completion.sh
> +++ b/t/t9902-completion.sh
> @@ -1447,6 +1447,89 @@ 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

The rest looks good to me.