set -l rbenv_dir "$RBENV_ROOT"
if [ ! $rbenv_dir ]
  set rbenv_dir $HOME/.rbenv
end

set -l supports_fish
set -l supports_fish_version '0.4.0'
set -l user_version (eval $rbenv_dir/bin/rbenv --version | sed -E 's/^rbenv ([[:digit:]\.]{2,}).*$/\1/g')

if [ $user_version = $supports_fish_version ]
  set -l supports_fish_commits '56'
  set -l user_commits (eval $rbenv_dir/bin/rbenv --version | sed -E 's/^.+-([[:digit:]]{1,}).+$/\1/g')
  if [ $user_commits -ge $supports_fish_commits ]
    set supports_fish true
  end
else
  set -l higher_version (echo -e "$supports_fish_version\n$user_version" | \
                          sort --field-separator . \
                            --key 1,1 --numeric-sort --reverse \
                            --key 2,2 --numeric-sort --reverse \
                            --key 3,3 --numeric-sort --reverse | \
                          head -n 1)
  if [ $user_version = $higher_version ]
    set supports_fish true
  end
end

_prepend_path $rbenv_dir/bin
if [ $supports_fish ]
  status --is-interactive; and source (eval $rbenv_dir/bin/rbenv init - | psub)
else
  _prepend_path $rbenv_dir/shims
end