count number of commits for each author in a git repository

countAuthorCommits.sh

#!/opt/homebrew/Cellar/bash/5.2.21/bin/bash

# echo "running in shell: $(ps -p $$)"

# Check if a directory argument was provided
if [ $# -eq 0 ]; then
  echo "Usage: $0 <directory>"
  exit 1
fi

# Check if the provided argument is a directory
if [ ! -d "$1" ]; then
  echo "Error: '$1' is not a valid directory."
  exit 1
fi

# Perform operations on the provided directory
directory="$1"
absolute_path=$(realpath "$directory")
git_directory="$directory/.git"

if [ ! -d "$git_directory" ]; then
  echo "'$absolute_path' is not a Git repository."
  exit 1
fi

echo "Absolute path of '$directory' is: $absolute_path"

cd "$absolute_path"

# Initialize an associative array to store commit counts per author
declare -A commit_counts

# Iterate through all commits and count them per author
while read author; do
  ((commit_counts["$author"]++))
done < <(git log --format='%aN')

# Print the commit counts for each author
for author in "${!commit_counts[@]}"; do
  echo "Author: $author, Commits: ${commit_counts[$author]}"
done

cd -

some shell compatability issues with 'declare' keyword, most shell's don't seem to like it.