#!/usr/bin/env bash
## Gives you a list of author names with the number of lines last updated by that user in files in the current directory tree with the extension specified.
## Source: git-extra-commands

#
# Gives you a list of names with the number of lines last updated by that
# user in files with the extension specified
#
# Copyright 2019, Neil Killeen <nkilleen@castlighthealth.com>
#
# Requires GNU sed

set -o pipefail

temp_ifs=$IFS;
temp_lc_all=$LC_ALL
IFS="|"
LC_ALL="C"
args="$*"

git ls-tree -r HEAD | \
  gsed -re 's/^.{53}//' | \
  while read filename; do file "$filename"; done | \
    grep -E ".*\.(${args})" | \
    gsed -r -e 's/: .*//' | \
    while read filename; do git blame -w "$filename"; done | \
      gsed -r -e 's/.*\((.*)[0-9]{4}-[0-9]{2}-[0-9]{2} .*/\1/' -e 's/ +$//' | \
      sort -gif | uniq -c

IFS=${temp_ifs}
LC_ALL=${temp_lc_all}