A shell script to count how many lines of code in each language each author added/removed in a repo

count_tech

#!/bin/bash

git status &>-
if [ "$?" -ne 0 ]; then
  printf "%0s$(echo -en "\033[1;31m")Error :$(echo -en "\033[0m") Run this command in a git repo"
  exit 1
fi

declare -A techs=( ["Ruby"]="rb" ["Javascript"]="js" ["Html"]="html" ["Css"]="css")
authors=$(git shortlog -s | awk '{print $2}')

for tech in "${!techs[@]}"; do
  printf "%0s[ $(echo -en "\033[1;32m")$tech$(echo -en "\033[0m") ]\n"

  read maxA maxR <<<$(git log --pretty=format: --numstat | grep -v vendor | grep -w ${techs["$tech"]} | awk '{ ADDED+= $1 } {REM+= $2 } END { print ADDED, REM}')

  for at in ${authors[@]}; do
    read a r <<<$(git log --author $at --pretty=format: --numstat | grep -v vendor | grep -w ${techs["$tech"]} | awk '{ ADDED+= $1 } { REM+= $2 } END { print ADDED, REM }')

    if [ ! -z "$a" ] && [ "$maxA" -ne 0 ]; then
      ap=$(echo "scale=2; $a / $maxA * 100" | bc)
    fi

    if [ ! -z "$r" ] && [ "$maxR" -ne 0 ]; then
      rp=$(echo "scale=2; $r / $maxR * 100" | bc)
    fi

    if [ ! -z "$a" ]; then
      printf "%3s[ $(echo -en "\033[1;36m")$at$(echo -en "\033[0m") ] ~> "
      printf "$(echo -en "\033[1;32m")+++ $a$(echo -en "\033[0m") ($ap)"
    fi
    
    if [ ! -z "$r" ]; then
      printf " | "
      printf "$(echo -en "\033[1;31m")--- $r$(echo -en "\033[0m") ($rp)\n"
    fi
  done

  printf "\n"
done