Get lines changed by contributor

count_changes.sh

#!/bin/bash
# Counts the number of additions + deletions across all commits, grouping commits by contributor.
# Changes are capped at 1,000 changes per commit to limit impact of large scale refactors.

declare -A author_line_changes

# Loop through each commit hash
git log --pretty=format:'%h %aN' | while read commit author; do
  # Get the number of additions and deletions for the commit
  additions=$(git show --numstat $commit | grep -E '^[0-9]' | awk '{s+=$1} END {print s}')
  deletions=$(git show --numstat $commit | grep -E '^[0-9]' | awk '{s+=$2} END {print s}')

  # Subtract the changes in package-lock.json
  package_lock_additions=$(git show --numstat $commit | grep 'package-lock.json' | awk '{s+=$1} END {print s}')
  package_lock_deletions=$(git show --numstat $commit | grep 'package-lock.json' | awk '{s+=$1} END {print s}')

  additions=$((additions - package_lock_additions))
  deletions=$((deletions - package_lock_deletions))

  # If additions or deletions are empty, set them to 0
  [ -z "$additions" -o "$additions" -lt 0 ] && additions=0
  [ -z "$deletions" -o "$deletions" -lt 0 ] && deletions=0
  
  # Calculate the total line changes for the commit
  commit_line_changes=$((additions + deletions))
  
  # If the line changes for this commit are greater than 1000, count them as 1000
  if [ "$commit_line_changes" -gt 1000 ]; then
    commit_line_changes=1000
  fi
  
  # Add the line changes for this commit to the corresponding author's total line changes
  author_line_changes["$author"]=$((author_line_changes["$author"] + commit_line_changes))

  for author in "${!author_line_changes[@]}"; do
    echo "$author: ${author_line_changes["$author"]} line changes"
  done
  echo ""
done

# Print the total line changes for each author
for author in "${!author_line_changes[@]}"; do
  echo "$author: ${author_line_changes["$author"]} line changes"
done

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