(SDK-305) Answer file to cache module interview answers, template-url etc

lib/pdk.rb

@@ -1,3 +1,4 @@
+require 'pdk/answer_file'
 require 'pdk/generate'
 require 'pdk/i18n'
 require 'pdk/logger'

lib/pdk/answer_file.rb

@@ -0,0 +1,120 @@
+require 'json'
+
+module PDK
+  # Singleton accessor to the current answer file being used by the PDK.
+  #
+  # @return [PDK::AnswerFile] The AnswerFile instance currently being used by
+  #   the PDK.
+  def self.answers
+    @answer_file ||= PDK::AnswerFile.new
+  end
+
+  # Specify the path to a custom answer file that the PDK should use.
+  #
+  # @param path [String] A path on disk to the file where the PDK should store
+  #   answers to interactive questions.
+  def self.answer_file=(value)
+    @answer_file = PDK::AnswerFile.new(value)
+  end
+
+  class AnswerFile
+    attr_reader :answers
+    attr_reader :answer_file_path
+
+    # Initialises the AnswerFile object, which stores the responses to certain
+    # interactive questions.
+    #
+    # @param answer_file_path [String, nil] The path on disk to the file where
+    #   the answers will be stored and read from. If not specified (or `nil`),
+    #   the default path will be used (see #default_answer_file_path).
+    #
+    # @raise (see #read_from_disk)
+    def initialize(answer_file_path = nil)
+      @answer_file_path = answer_file_path || default_answer_file_path
+      @answers = read_from_disk
+    end
+
+    # Retrieve the stored answer to a question.
+    #
+    # @param question [String] The question name/identifying string.
+    #
+    # @return [Object] The answer to the question, or `nil` if no answer found.
+    def [](question)
+      answers[question]
+    end
+
+    # Update the stored answers in memory and then save them to disk.
+    #
+    # @param new_answers [Hash{String => Object}] The new questions and answers
+    #   to be merged into the existing answers.
+    #
+    # @raise [PDK::CLI::FatalError] if the new answers are not provided as
+    #   a Hash.
+    # @raise (see #save_to_disk)
+    def update!(new_answers = {})
+      unless new_answers.is_a?(Hash)
+        raise PDK::CLI::FatalError, _('Answer file can only be updated with a Hash')
+      end
+
+      answers.merge!(new_answers)
+
+      save_to_disk
+    end
+
+    private
+
+    # Determine the default path to the answer file.
+    #
+    # @return [String] The path on disk to the default answer file.
+    def default_answer_file_path
+      File.join(PDK::Util.cachedir, 'answers.json')
+    end
+
+    # Read existing answers into memory from the answer file on disk.
+    #
+    # @raise [PDK::CLI::FatalError] If the answer file exists but can not be
+    #   read.
+    #
+    # @return [Hash{String => Object}] The existing questions and answers.
+    def read_from_disk
+      return {} if !File.file?(answer_file_path) || File.zero?(answer_file_path)
+
+      unless File.readable?(answer_file_path)
+        raise PDK::CLI::FatalError, _("Unable to open '%{file}' for reading") % {
+          file: answer_file_path,
+        }
+      end
+
+      answers = JSON.parse(File.read(answer_file_path))
+      if answers.is_a?(Hash)
+        answers
+      else
+        PDK.logger.warn _("Answer file '%{path}' did not contain a valid set of answers, recreating it") % {
+          path: answer_file_path,
+        }
+        {}
+      end
+    rescue JSON::JSONError
+      PDK.logger.warn _("Answer file '%{path}' did not contain valid JSON, recreating it") % {
+        path: answer_file_path,
+      }
+      {}
+    end
+
+    # Save the in memory answer set to the answer file on disk.
+    #
+    # @raise [PDK::CLI::FatalError] if the answer file can not be written to.
+    def save_to_disk
+      FileUtils.mkdir_p(File.dirname(answer_file_path))
+
+      File.open(answer_file_path, 'w') do |answer_file|
+        answer_file.puts JSON.pretty_generate(answers)
+      end
+    rescue SystemCallError, IOError => e
+      raise PDK::CLI::FatalError, _("Unable to write '%{file}': %{msg}") % {
+        file: answer_file_path,
+        msg:  e.message,
+      }
+    end
+  end
+end

lib/pdk/cli.rb

@@ -66,6 +66,10 @@ def self.template_url_option(dsl)
     flag :d, :debug, _('Enable debug output.') do |_, _|
       PDK.logger.enable_debug_output
     end
+
+    option nil, 'answer-file', _('Path to an answer file'), argument: :required, hidden: true do |value|
+      PDK.answer_file = value
+    end
   end
 
   require 'pdk/cli/new'

lib/pdk/cli/util/interview.rb

@@ -27,9 +27,9 @@ def run
           num_questions = @questions.count
           @questions.each do |question_name, question|
             @name = question_name
-            puts pastel.bold(_('[Q %{current_number}/%{questions_total}]') % { current_number: i, questions_total: num_questions })
-            puts pastel.bold(question[:question])
-            puts question[:help]
+            @prompt.print pastel.bold(_('[Q %{current_number}/%{questions_total}]') % { current_number: i, questions_total: num_questions })
+            @prompt.print pastel.bold(question[:question])
+            @prompt.print question[:help]
             ask(_('-->')) do |q|
               q.required(question.fetch(:required, false))
 
@@ -40,7 +40,7 @@ def run
               q.default(question[:default]) if question.key?(:default)
             end
             i += 1
-            puts ''
+            @prompt.print ''
           end
           @answers
         rescue TTY::Prompt::Reader::InputInterrupt

lib/pdk/generators/module.rb

@@ -30,7 +30,7 @@ def self.invoke(opts = {})
 
         prepare_module_directory(temp_target_dir)
 
-        template_url = opts.fetch(:'template-url', DEFAULT_TEMPLATE)
+        template_url = opts.fetch(:'template-url', PDK.answers['template-url'] || DEFAULT_TEMPLATE)
 
         PDK::Module::TemplateDir.new(template_url) do |templates|
           templates.render do |file_path, file_content|
@@ -48,28 +48,42 @@ def self.invoke(opts = {})
           end
         end
 
+        PDK.answers.update!('template-url' => template_url)
+
         FileUtils.mv(temp_target_dir, target_dir)
       end
 
-      def self.prepare_metadata(opts)
-        username = Etc.getlogin.gsub(%r{[^0-9a-z]}i, '')
-        username = 'username' if username == ''
-        if Etc.getlogin != username
-          PDK.logger.warn(_('Your username is not a valid Forge username, proceeding with the username %{username}' % { username: username }))
+      def self.username_from_login
+        login = Etc.getlogin
+        login_clean = login.gsub(%r{[^0-9a-z]}i, '')
+        login_clean = 'username' if login_clean.empty?
+
+        if login_clean != login
+          PDK.logger.warn _('You username is not a valid Forge username, proceeding with the username %{username}') % {
+            username: login_clean,
+          }
         end
 
+        login_clean
+      end
+
+      def self.prepare_metadata(opts)
+        username = PDK.answers['forge-username'] || username_from_login
+
         defaults = {
           'name'         => "#{username}-#{opts[:name]}",
           'version'      => '0.1.0',
           'dependencies' => [
             { 'name' => 'puppetlabs-stdlib', 'version_requirement' => '>= 4.13.1 < 5.0.0' },
           ],
         }
+        defaults['author'] = PDK.answers['author'] unless PDK.answers['author'].nil?
+        defaults['license'] = PDK.answers['license'] unless PDK.answers['license'].nil?
         defaults['license'] = opts[:license] if opts.key? :license
 
         metadata = PDK::Module::Metadata.new(defaults)
 
-        module_interview(metadata, opts) unless opts[:'skip-interview'] # @todo Build way to get info by answers file
+        module_interview(metadata, opts) unless opts[:'skip-interview']
 
         metadata.update!('pdk-version' => PDK::Util::Version.version_string)
 
@@ -98,7 +112,7 @@ def self.module_interview(metadata, opts = {})
             required:         true,
             validate_pattern: %r{\A[a-z0-9]+\Z}i,
             validate_message: _('Forge usernames can only contain lowercase letters and numbers'),
-            default:          metadata.data['author'],
+            default:          PDK.answers['forge-username'] || metadata.data['author'],
           },
           {
             name:             'version',
@@ -167,11 +181,13 @@ def self.module_interview(metadata, opts = {})
         answers = interview.run
 
         if answers.nil?
-          puts _('Interview cancelled, aborting...')
+          PDK.logger.info _('Interview cancelled, not generating the module.')
           exit 0
         end
 
+        forge_username = answers['name']
         answers['name'] = "#{answers['name']}-#{opts[:name]}"
+        answers['license'] = opts[:license] if opts.key?(:license)
         metadata.update!(answers)
 
         puts '-' * 40
@@ -181,10 +197,16 @@ def self.module_interview(metadata, opts = {})
         puts '-' * 40
         puts
 
-        unless prompt.yes?(_('About to generate this module; continue?')) # rubocop:disable Style/GuardClause
-          puts _('Aborting...')
+        unless prompt.yes?(_('About to generate this module; continue?'))
+          PDK.logger.info _('Module not generated.')
           exit 0
         end
+
+        PDK.answers.update!(
+          'forge-username' => forge_username,
+          'author'         => answers['author'],
+          'license'        => answers['license'],
+        )
       end
     end
   end

spec/acceptance/support/in_a_new_module.rb

@@ -2,7 +2,13 @@
 
 shared_context 'in a new module' do |name|
   before(:all) do
-    output, status = Open3.capture2e('pdk', 'new', 'module', name, '--skip-interview', '--template-url', "file://#{RSpec.configuration.template_dir}")
+    argv = [
+      'pdk', 'new', 'module', name,
+      '--skip-interview',
+      '--template-url', "file:///#{RSpec.configuration.template_dir}",
+      '--answer-file', File.join(Dir.pwd, "#{name}_answers.json")
+    ]
+    output, status = Open3.capture2e(*argv)
 
     raise "Failed to create test module:\n#{output}" unless status.success?
 
@@ -12,5 +18,6 @@
   after(:all) do
     Dir.chdir('..')
     FileUtils.rm_rf(name)
+    FileUtils.rm("#{name}_answers.json")
   end
 end