Git hook for Pivotal Tracker

prepare-commit-msg.sh

#!/bin/bash

prepend ()
{
  # extract branch name
  branch_name=$(git symbolic-ref -q HEAD)
  branch_name=${branch_name##refs/heads/}
  # extract story ID
  [[ ${branch_name} =~ ^(chore|feature|bug)\/X([[:digit:]]+)$ ]] && sed -i '' '1i\
'"[#${BASH_REMATCH[2]}] " "$1"
}

case "$2" in
  template) # exclude templates, merges, squashes
    ;;
  merge)
    ;;
  squash)
    ;;
  *)
    if [ -z "$3" ]; then # exclude amends
      prepend $1
    fi
    ;;
esac

exit 0