Gets all links property keys for all frontend schemas (from alphagov/govuk-content-schemas).

links_by_schema.rb

# Requires alphagov/govuk-content-schemas to be checked out in the same dir as this script.
# $ ruby links_by_schema.rb
# writes csv output to ./schema-links.csv
require 'csv'
require 'json'

def schema_name_from_file(schema_file)
  schema_file.split("/")[4]
end

CSV.open("./schema-links.csv", "w") do |csv|
  Dir["./govuk-content-schemas/dist/formats/*/frontend/schema.json"].each do |schema_file|
    json = File.read(schema_file)
    hash = JSON.parse(json)
    schema_name = schema_name_from_file(schema_file)
    if links = hash["properties"]["links"]
      csv << [schema_name, links["properties"].keys.join(",")]
    end 
  end 
end