Re: [PATCH v4 0/3] diff: add pathspec support to --no-index

> From: Jacob Keller <jacob.keller@gmail.com>
>
> This series adds support for using pathspecs to limit the comparison when
> using git diff --no-index. This is similar to how you can limit what is
> included with pathspecs when comparing inside a repository.
>
> This version uses only one set of pathspecs and instead uses some logic to
> skip past the root of each directory tree being scanned. This avoids needing
> to parse pathspecs multiple times, and is overall a simpler approach.
>
> I also opted to add a match_leading_pathspec() instead of exposing the
> match_pathspec_with_flags(), since I didn't how DO_MATCH_EXCLUDES wasn't
> exposed. It felt messy.
>
> I tried a couple of different methods for skipping past the leading portion
> of a path, including skip_prefix. Ultimately just the index to skip to
> seemed like the simplest solution. I like that it means we only need a
> single pathspec array now, and that we no longer have to worry about
> changing prefix_path_gently.
>
> Changes since v3:
> * Drop the patch modifying prefix_path(_gently).
> * Instead of exposing the do_match_pathspec flags, create a
>   match_leading_pathspec() variant that sets both flags when is_dir is true.
> * Use some simple logic to skip past the starting portions of each path
>   before calling match_leading_pathspec
> * Re-write the commit message for the final patch
> * Add a couple more test cases
> * Simplify existing test cases to use --name-status
> * Drop remaining TODOs