Re: [PATCH v2 6/8] checkout: restructure switch, restore, and checkout entrypoints

> cmd_switch(), cmd_restore(), and cmd_checkout() pass their options
> to checkout_main(), which parses options and configuration,
> validates and dispatches to checkout_branch() or checkout_paths().
>
> Now that option initialization, validation, and branch setup have been
> split into dedicated helper functions, restructure cmd_switch(),
> cmd_restore(), and cmd_checkout() to invoke these helpers directly and
> dispatch to checkout_branch() or checkout_paths().
>
> In cmd_restore(), handle the --staged default from_treeish = "HEAD" and
> resolve opts.from_treeish into new_branch_info and opts.source_tree.
>
> This allows us to remove checkout_main() and enum checkout_command
> as they are no longer needed.
>
> Signed-off-by: Junio C Hamano <gitster@pobox.com>
> ---
>  builtin/checkout.c | 297 +++++++++++++++++++++++----------------------
>  1 file changed, 149 insertions(+), 148 deletions(-)
>
> diff --git a/builtin/checkout.c b/builtin/checkout.c
> index 2edaca5539..b18515ac7f 100644
> --- a/builtin/checkout.c
> +++ b/builtin/checkout.c
> @@ -1341,12 +1341,6 @@ static void setup_new_branch_info_and_source_tree(
>  }
>
>
> -enum checkout_command {
> -	CHECKOUT_CHECKOUT = 1,
> -	CHECKOUT_SWITCH = 2,
> -	CHECKOUT_RESTORE = 3,
> -};
> -