git-file-pick

#!/usr/bin/env bash

set -eu
set -o pipefail

filter_files() {
    local -r ref_name="$1"
    # select files by TAB
    git --no-pager diff --diff-filter=ACMU --name-only "$ref_name" | fzf -m
}

select_ref() {
    (git --no-pager branch; git --no-pager branch -r) | awk '$0=$NF' | sort | uniq | fzf
}

main() {
    local -r ref_name=$(select_ref)

    git checkout "$ref_name" -- $(filter_files "$ref_name" | xargs)
}

main