Calculate production code contributions from git

git-contrib

#!/usr/bin/env bash

# This script calculates author contributions. It counts all git indexed lines
# that somehow contribute to the production value. All test files, lock files
# and binary files are excluded. Also it prints file names as progress
# indicator.
#
# * Counts only living contributions
# * Lines of code that have been changed are attributed to the last author
# * Misconfigured git names will lead to scrambled contributions

files=$(git ls-files\
  | grep -vE '(spec|__tests?__|\/tests?\/)' \
  | grep -vE '(package-lock.json|yarn.lock|^\.yarn)')

for file in $files; do
  if file $file | grep -q "text"; then
    echo -en "\033[1K\rChecking ${file:0:$(($(tput cols) - 16))}..." >&2
    git blame --date=format: $file \
      | cut -d '(' -f2 \
      | cut -d ')' -f1 \
      | rev \
      | cut -d ' ' -f 2- \
      | xargs -L 1 echo \
      | rev 
    echo -en "\033[1K\r" >&2
  fi
done | sort | uniq -c | sort -n