RVM hook for ctags and gemtags auto generation.put in ~/.rvm/hooks/, remember to chmod +x it

after_cd_ctags

#!/usr/bin/env bash

function generate_tags {
  (ctags -R -f .tags 2> /dev/null &)
}

function generate_gemtags {
  (bundle show --paths | xargs ctags -R -f .gemtags 2> /dev/null &)
}

# if in a ruby project and ctags exists
if [ -f Gemfile ] && hash ctags
then
  # if no tags
  if [ ! -f .tags ]
  then
    echo 'Generating ctags...'
    generate_tags
  # if tags older than 3 days
  elif test `find ".tags" -mmin +5000`
  then
    echo 'Updating ctags...'
    generate_tags
  fi

  # if no gemtags
  if [ ! -f .gemtags ]
  then
    echo 'Generating gemtags...'
    generate_gemtags
  # if gemtags older than Gemfile.lock
  elif [ -f "Gemfile.lock" -a ".gemtags" -ot "Gemfile.lock" ]
  then
    echo 'Updating gemtags...'
    generate_gemtags
  fi
fi