mddiff.sh

function mddiff()
{
  LEFT_REF=$1
  RIGHT_REF=$2
  NAME=$(basename ${PWD})

  if [ -z "${LEFT_REF:-}" ] || [ -z "${RIGHT_REF:-}" ]; then
    echo "Please specify the branches, tags, or commits to compare." >&2
    echo "  Usage: mddiff ref1 ref2" >&2
    echo "  Example: mddiff 21.11.0 origin/release21.11-SNAPSHOT" >&2
    return 1
  fi
  if ! command -v hub > /dev/null; then
    echo 'Error: GitHub command line tool is not installed. https://hub.github.com/' >&2
    return 1
  fi
  
  BASE_URL=$(hub browse -u)

  echo ''
  echo "#### [${NAME}](${BASE_URL}/compare/$(echo ${LEFT_REF} | sed 's/origin\///')...$(echo ${RIGHT_REF} | sed 's/origin\///'))"
  git log ${LEFT_REF}..${RIGHT_REF} --no-merges --decorate --decorate-refs=refs/tags/ --pretty=format:" -%d [%s]($BASE_URL/commit/%H)" --topo-order
}