Re: [PATCH v1 1/2] merge: Add merge.renames config setting

[Elijah Newren <newren@gmail.com>]

On Fri, Apr 20, 2018 at 6:36 AM, Ben Peart <Ben.Peart@microsoft.com> wrote:
> --- a/Documentation/merge-config.txt
> +++ b/Documentation/merge-config.txt
> @@ -37,6 +37,11 @@ merge.renameLimit::
>         during a merge; if not specified, defaults to the value of
>         diff.renameLimit.
>
> +merge.renames::
> +       Whether and how Git detects renames.  If set to "false",
> +       rename detection is disabled. If set to "true", basic rename
> +       detection is enabled. This is the default.

One can already control o->detect_rename via the -Xno-renames and
-Xfind-renames options.  I think the documentation should mention that
"false" is the same as passing -Xno-renames, and "true" is the same as
passing -Xfind-renames.  However, find-renames does take similarity
threshold as a parameter, so there's a question whether this option
should provide some way to do the same.  I'm not sure the answer to
that; it may be that we'd want a separate config option for that, and
we can wait to add it until someone actually wants it.

>  merge.renormalize::
>         Tell Git that canonical representation of files in the
>         repository has changed over time (e.g. earlier commits record
> diff --git a/merge-recursive.c b/merge-recursive.c
> index 9c05eb7f70..cd5367e890 100644
> --- a/merge-recursive.c
> +++ b/merge-recursive.c
> @@ -3256,6 +3256,7 @@ static void merge_recursive_config(struct merge_options *o)
>         git_config_get_int("merge.verbosity", &o->verbosity);
>         git_config_get_int("diff.renamelimit", &o->diff_rename_limit);
>         git_config_get_int("merge.renamelimit", &o->merge_rename_limit);
> +       git_config_get_bool("merge.renames", &o->detect_rename);
>         git_config(git_xmerge_config, NULL);
>  }

I would expect an explicitly passed -Xno-renames or -Xfind-renames to
override the config setting.  Could you check if that's the case?

Also, if someone sets merge.renameLimit (to anything) and sets
merge.renames to false, then they've got a contradictory setup.  Does
it make sense to check and warn about that anywhere?