Measure SLOC evolution in time

sloc_in_time.sh

#!/usr/bin/env bash

branch="$(git rev-parse --abbrev-ref HEAD)"
dir=api

echo "Starting from branch: $branch"

commits_with_dates=()

function find_commits() {
  for i in $(seq 2020 2018)
  do
    for j in $(seq -w 12 1)
    do
      local year_month="$i-$j"
      echo "Searching commit for: $year_month"
      local commit
      commit=$(git log --after=\'"$year_month"-01\' --before=\'"$year_month"-08\' --simplify-merges --pretty='format:%h' "$dir" | tail -1)
      if [ -z "$commit" ]
      then
        echo "INFO: No commit found."
      else
        commits_with_dates+=("$commit $year_month-01")
      fi
    done
  done
}

function process_commits() {
  for commit_with_date in "${commits_with_dates[@]}"
  do
    printf '%s ' "$commit_with_date"
    local commit
    commit="$(echo $commit_with_date | awk '{ print $1 }')"
    git checkout "$commit" > /dev/null 2>&1
    tokei -e node_modules "$dir" | grep JavaScript | awk '{ print $4 }'
  done
}

function restore_position() {
  git checkout "$branch"
}

find_commits
process_commits
restore_position