#!/usr/bin/env bash
set -eufo pipefail
IFS=$' \t'

#shellcheck disable=SC2046
# ignore files outside WD, to avoid overload
git diff --name-only --diff-filter=U --relative -z |
    while IFS= read -r -d '' f; do
        # `--quiet` implies `--exit-code` which is incompatible with `--check`;
        # however, it could be special-cased internally, so it could work
        # (untested)
        if ! git -c core.whitespace='' diff --check -- "$f" &>/dev/null; then
            printf '%s\0' "$f"
        fi
    done |
    # WARN: `-r` is too new
    # https://github.com/tj/git-extras/pull/1233#issuecomment-3957233996
    xargs -0r $(git var GIT_EDITOR)

# user might have removed other conflict-markers,
# so check full WT
git diff --name-only --diff-filter=U -z |
    while IFS= read -r -d '' f; do
        # WARN: `f` is relative to repo root!
        # this might be broken
        if git -c core.whitespace='' diff --check -- "$f"; then
            git add -- "$f"
        fi
    done