git_helper bash function

git_helper.sh

git_helper() {
  usage(){
    echo "Usage: git_aid [command]"
    echo ""
    echo "Where [command] is any of,"
    echo " * last commit. Shows last commit"
    echo " * last branch. Shows last commit"
    echo " * recent branches. Shows a list of recent branches and commits with committer"
    echo " * recent commits. Shows a list of recent branches and commits with committer"
    echo " * diff commits. Shows the difference between the two last commits"
    return 1
  } # define is_file_exits function

  
  [[ $# -eq 0 ]] && usage
  git fetch --all
  if [ "${1}" == "last" ]; then
    if [ "${2}" == "commit" ]; then
      git log --color --format="%C(magenta)%cr %C(bold red)%d%Creset %C(bold cyan)%H%Creset %s %C(bold blue)<%an>%Creset" | head -n 1
    elif [ "${2}" == "branch" ]; then
     git branch -r | grep -v HEAD | while read b; do git log --color  --format="%ci _%C(magenta)%cr %C(bold red)$b%d%Creset%C(bold cyan) %H%Creset %s %C(bold blue)<%an>%Creset" $b | head -n 1; done | sort -r | cut -d_ -f2- | sed 's;origin/;;g' | head -n 1
    else
      usage
      echo ""
      echo "Unrecognized command '$1'"
    fi
  elif [ "${1}" == "recent" ]; then
    if [ "${2}" == "branches" ] || [ "${2}" == "commits" ]; then
      git branch -r | grep -v HEAD | while read b; do git log --color --format="%ci _%C(magenta)%cr %C(bold red)$b%d%Creset%C(bold cyan) %H%Creset %s %C(bold blue)<%an>%Creset" $b | head -n 10; done | sort -r | cut -d_ -f2- | sed 's;origin/;;g' | head -n 10 
    fi
  elif [ "${1}" == "diff" ]; then
    if [ "${2}" == "commits" ]; then
      previousToLast=$(git branch -r | grep -v HEAD | while read b; do git log --format="%ci %cr %H" $b | head -n 10; done | sort -r | cut -d_ -f2- | sed 's;origin/;;g' | head -n 2 | tail -n 1 | awk '{print $NF}')
      lastCommit=$(git branch -r | grep -v HEAD | while read b; do git log --format="%ci %cr %H" $b | head -n 10; done | sort -r | cut -d_ -f2- | sed 's;origin/;;g' | head -n 1 | awk '{print $NF}')
      git diff $previousToLast^..$lastCommit
    fi
  else
    usage
    echo ""
    echo "Unrecognized command :("
  fi
}