#!/usr/bin/env bash
#
# https://gist.github.com/jeebak/f9088cede18d31f2d3a0
#

[[ $# -ne 2 ]] && echo "Usage: git pie-fiy pattern replacement" && exit 1

pattern="$(sed 's;/;\\/;g' <<< "$1")"
replacement="$(sed 's;/;\\/;g' <<< "$2")"

while read -r file; do
  if [[ -f "$file" ]]; then
    echo "Processing: '$file'"
    # TODO: fall back to sed, if perl's not available, accounting for different
    # (osx/linux) versions.
    perl -p -i -e 's/'"$pattern"'/'"$replacement"'/g' "$file"
  fi
done <<< "$(git grep --name-only "$pattern")"