HOME_local_lib_git_find

#!/bin/bash
#
# Save this script as $HOME/.local/lib/git/find (make sure it's
# executable), then add a git alias:
#
# $ git config --global alias.find '!$HOME/.local/lib/git/find'
#

T="$(git rev-parse --show-toplevel)"
[[ -z "$T" ]] || T="$T/"
P="$T$GIT_PREFIX"

if (( ${#@} )); then
  A=("${@/#/$P}")
else
  A=("$P")
fi

git ls-tree -r HEAD -- "${A[@]}" | grep -E '^[0-9]+ blob ' | cut -f2 \
| head -c-1 | tr '\n' '\0' | xargs -0 realpath --relative-to="$P"