Re: [PATCH v6 4/4] git-rebase: add keep_empty flag

> Add a command line switch to git-rebase to allow a user the ability to specify
> that they want to keep any commits in a series that are empty.
>
> When git-rebase's type is am, then this option will automatically keep any
> commit that has a tree object identical to its parent.
>
> This patch changes the default behavior of interactive rebases as well.  With
> this patch, git-rebase -i will produce a revision set passed to
> git-revision-editor, in which empty commits are commented out.  Empty commits
> may be kept manually by uncommenting them.  If the new --keep-empty option is
> used in an interactive rebase the empty commits will automatically all be
> uncommented in the editor.
>
> Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
> ---

> diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
> index 5812222..cef290b 100644
> --- a/git-rebase--interactive.sh
> +++ b/git-rebase--interactive.sh
> @@ -167,6 +167,12 @@ has_action () {
>  	sane_grep '^[^#]' "$1" >/dev/null
>  }
>  
> +is_empty_commit() {
> +	tree=$(git rev-parse "$1"^{tree})
> +	ptree=$(git rev-parse "$1"^^{tree})
> +	return $(test "$tree" = "$ptree")
> +}