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lib/elmer.ex

defmodule Elmer do
def prompt_path do
if is_nil Application.get_env(:elmer, :elmpath) do
Mix.shell.info "Set :elmer, :elmpath in your app config to suppress this prompt."
Mix.shell.prompt("What is the path to your elm app?\n|>")|> String.strip() |> Path.expand()
else
Application.get_env(:elmer, :elmpath)
end
end
end