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Re: [PATCH 2/5] mergetool: use get_merge_tool function

On Mon, Apr 22, 2019 at 1:07 AM Denton Liu <liu.denton@xxxxxxxxx> wrote:
> [...]
> Rewrite `get_merge_tool` to return whether or not the tool was guessed
> and make git-mergetool call this function instead of duplicating the
> logic. Also, let `$GIT_MERGETOOL_GUI` be set to determine whether or not
> the guitool will be selected.
> Signed-off-by: Denton Liu <liu.denton@xxxxxxxxx>
> ---
> diff --git a/Documentation/git-mergetool--lib.txt b/Documentation/git-mergetool--lib.txt
> @@ -28,7 +28,10 @@ to define the operation mode for the functions listed below.
>  get_merge_tool::
> -       returns a merge tool.
> +       returns '$is_guessed:$merge_tool'. '$is_guessed' is 'true' if
> +       the tool was guessed, else 'false'. '$merge_tool' is the merge
> +       tool to use. '$GIT_MERGETOOL_GUI' may be set to 'true' to search
> +       for the appropriate guitool.

What is the likelihood that code outside of our control is using this
function? If there is such code, this backward-incompatible change
will break that code. If the likelihood is excessively small, perhaps
it is not worth worrying about, otherwise, perhaps this warrants a new
function with a distinct name.