POWERLEVEL9K custom elixir/erlang prompt segment

asdf_elixir.sh

POWERLEVEL9K_ELIXIR_ICON=$'\ue62d'
prompt_asdf_elixir() {
  if [ $commands[asdf] ]; then
    ELIXIR_ICON=$'\ue62d'
    local asdf_global_conf="$HOME/.tool-versions"
    local version_regex="s/^\([.0-9]*\).*/\1/p"
    local config_regex="s/.*(set by \(.*\))/\1/p"

    local elixir_current="$(asdf current elixir)"
    local elixir_current_version="$(echo $elixir_current | sed -n $version_regex)"
    local elixir_current_conf="$(echo $elixir_current | sed -n $config_regex)"

    local erlang_current="$(asdf current erlang)"
    local erlang_current_version="$(echo $erlang_current |  sed -n $version_regex)"
    local erlang_current_conf="$(echo $erlang_current | sed -n $config_regex)"
    if [[ "${asdf_global_conf}" != "${elixir_current_conf}" || "${asdf_global_conf}" != "${erlang_current_conf}" ]]; then
      "$1_prompt_segment" "$0" "$2" "mediumpurple4" "white" "$elixir_current_version (on Erlang $erlang_current_version)" 'ELIXIR_ICON'
    fi
  fi
}