main.cr

macro parse_yaml(filename)
  {{ run("./yamlparser.cr", filename) }}
end

parse_yaml("tmp.yml")

puts dev["array"]
puts prod["array"]

tmp.yml

prod:
  string: "foobar"
  array:
    - John
    - Clara
  hash: {key: value}
  paragraph: |
    foo
    bar
dev:
  string: "moobar"
  array:
    - Riley
    - Sarah
  hash: {key: value}
  paragraph: |
    moo
    bar
test:
  string: "testbar"
  array:
    - Wren
    - Shauna
  hash: {key: value}
  paragraph: |
    test
    bar

yamlparser.cr

require "yaml"
if ARGV[0]?
  yml = YAML.parse(File.read(ARGV[0]))
  str = yml.as_h.keys.map do |k|
    String.build do |s|
      s << "def #{k}\n  "
      s << yml[k.to_s].as_h.inspect
      s << "\nend"
    end
  end.join("\n\n")
  puts str
else
  puts ""
end