Calculate size of a git commit object #git

git-commit-size

# Calculate the size of a git commit in bytes.
function git-commit-size() {
  # This script calculates the size of a git commit in bytes.
  # Usage: git-commit-size.sh <commit hash>
  #
  # Example:
  #   git-commit-size.sh 1234567
  #
  # Output:
  #   The total size of the commit in bytes, formatted with thousands separators.

  local BLOB_HASH_LIST COMMIT_SIZE HASH ITEM_LIST SIZE_LIST
  if (( $# != 1 )); then
    echo "Usage: git-commit-size.sh <commit hash>" 1>&2
    return 1
  fi

  HASH=$1
  # -r: recurse; -c: show differences from each parent of a merge commit simulaneously
  ITEM_LIST=$(
    git -c diff.renameLimit=0 diff-tree -r -c --find-copies --find-renames --no-commit-id "$HASH"
  )
  BLOB_HASH_LIST=$(echo "$ITEM_LIST" | awk '{ print $4 }')
  SIZE_LIST="$(
    echo "$BLOB_HASH_LIST" \
    | git cat-file --batch-check \
    | grep "blob" \
    | awk '{ print $3}'
  )"
  COMMIT_SIZE="$(echo "$SIZE_LIST" | awk '{ sum += $1 } END { print sum }')"
  LC_NUMERIC=en_US.UTF-8 printf "%'.0f\n" "$COMMIT_SIZE"
}