Find commits where `package.json` version was bumped.

find-version-commits.sh

filename="package.json"
pattern='  "version": "([0-9]+\.[0-9]+\.[0-9]+).*'

git log --pretty="format:%H" -- package.json | {
    while read current_hash; do
        if [ -n "$previous_hash" ]; then
            new_version=`git diff $previous_hash $current_hash -- $filename | sed -n -E -e "s/^\-$pattern/\1/p"`
            if [ -n "$new_version" ]; then
                echo version bumped to $new_version with $previous_hash
            fi
        fi
        previous_hash="$current_hash"
    done

    new_version=`git diff $previous_hash $current_hash -- $filename | sed -n -E -e "s/^\-$pattern/\1/p"`
    echo version bumped to $new_version with $previous_hash

    original_version=`git show $current_hash:$filename | sed -n -E -e "s/^$pattern/\1/p"`
    if [ -n "$original_version" ]; then
        echo "original version was $original_version"
    fi
}