actions.rb

# frozen_string_literal: true

require "shellwords"
require "active_support/core_ext/kernel/reporting"
require "active_support/core_ext/string/strip"

module Rails
  module Generators
    module Actions
      def initialize(*) # :nodoc:
        super
        @indentation = 0
      end

      # Adds an entry into +Gemfile+ for the supplied gem.
      #
      #   gem "rspec", group: :test
      #   gem "technoweenie-restful-authentication", lib: "restful-authentication", source: "http://gems.github.com/"
      #   gem "rails", "3.0", git: "https://github.com/rails/rails"
      #   gem "RedCloth", ">= 4.1.0", "< 4.2.0"
      #   gem "rspec", comment: "Put this comment above the gem declaration"
      def gem(*args)
        options = args.extract_options!
        name, *versions = args

        # Set the message to be shown in logs. Uses the git repo if one is given,
        # otherwise use name (version).
        parts, message = [ quote(name) ], name.dup

        # Output a comment above the gem declaration.
        comment = options.delete(:comment)

        if versions = versions.any? ? versions : options.delete(:version)
          _versions = Array(versions)
          _versions.each do |version|
            parts << quote(version)
          end
          message << " (#{_versions.join(", ")})"
        end
        message = options[:git] if options[:git]

        log :gemfile, message

        parts << quote(options) unless options.empty?

        in_root do
          str = []
          if comment
            comment.each_line do |comment_line|
              str << indentation
              str << "# #{comment_line}"
            end
            str << "\n"
          end
          str << indentation
          str << "gem #{parts.join(", ")}"
          append_file_with_newline "Gemfile", str.join, verbose: false
        end
      end

      # Wraps gem entries inside a group.
      #
      #   gem_group :development, :test do
      #     gem "rspec-rails"
      #   end
      def gem_group(*names, &block)
        options = names.extract_options!
        str = names.map(&:inspect)
        str << quote(options) unless options.empty?
        str = str.join(", ")
        log :gemfile, "group #{str}"

        in_root do
          append_file_with_newline "Gemfile", "\ngroup #{str} do", force: true
          with_indentation(&block)
          append_file_with_newline "Gemfile", "end", force: true
        end
      end

      def github(repo, options = {}, &block)
        str = [quote(repo)]
        str << quote(options) unless options.empty?
        str = str.join(", ")
        log :github, "github #{str}"

        in_root do
          if @indentation.zero?
            append_file_with_newline "Gemfile", "\ngithub #{str} do", force: true
          else
            append_file_with_newline "Gemfile", "#{indentation}github #{str} do", force: true
          end
          with_indentation(&block)
          append_file_with_newline "Gemfile", "#{indentation}end", force: true
        end
      end

      # Add the given source to +Gemfile+
      #
      # If block is given, gem entries in block are wrapped into the source group.
      #
      #   add_source "http://gems.github.com/"
      #
      #   add_source "http://gems.github.com/" do
      #     gem "rspec-rails"
      #   end
      def add_source(source, options = {}, &block)
        log :source, source

        in_root do
          if block
            append_file_with_newline "Gemfile", "\nsource #{quote(source)} do", force: true
            with_indentation(&block)
            append_file_with_newline "Gemfile", "end", force: true
          else
            prepend_file "Gemfile", "source #{quote(source)}\n", verbose: false
          end
        end
      end

      # Adds a line inside the Application class for <tt>config/application.rb</tt>.
      #
      # If options <tt>:env</tt> is specified, the line is appended to the corresponding
      # file in <tt>config/environments</tt>.
      #
      #   environment do
      #     "config.asset_host = 'cdn.provider.com'"
      #   end
      #
      #   environment(nil, env: "development") do
      #     "config.asset_host = 'localhost:3000'"
      #   end
      def environment(data = nil, options = {})
        sentinel = "class Application < Rails::Application\n"
        env_file_sentinel = "Rails.application.configure do\n"
        data ||= yield if block_given?

        in_root do
          if options[:env].nil?
            inject_into_file "config/application.rb", optimize_indentation(data, 4), after: sentinel, verbose: false
          else
            Array(options[:env]).each do |env|
              inject_into_file "config/environments/#{env}.rb", optimize_indentation(data, 2), after: env_file_sentinel, verbose: false
            end
          end
        end
      end
      alias :application :environment

      # Run a command in git.
      #
      #   git :init
      #   git add: "this.file that.rb"
      #   git add: "onefile.rb", rm: "badfile.cxx"
      def git(commands = {})
        if commands.is_a?(Symbol)
          run "git #{commands}"
        else
          commands.each do |cmd, options|
            run "git #{cmd} #{options}"
          end
        end
      end

      # Create a new file in the <tt>vendor/</tt> directory. Code can be specified
      # in a block or a data string can be given.
      #
      #   vendor("sekrit.rb") do
      #     sekrit_salt = "#{Time.now}--#{3.years.ago}--#{rand}--"
      #     "salt = '#{sekrit_salt}'"
      #   end
      #
      #   vendor("foreign.rb", "# Foreign code is fun")
      def vendor(filename, data = nil)
        log :vendor, filename
        data ||= yield if block_given?
        create_file("vendor/#{filename}", optimize_indentation(data), verbose: false)
      end

      # Create a new file in the <tt>lib/</tt> directory. Code can be specified
      # in a block or a data string can be given.
      #
      #   lib("crypto.rb") do
      #     "crypted_special_value = '#{rand}--#{Time.now}--#{rand(1337)}--'"
      #   end
      #
      #   lib("foreign.rb", "# Foreign code is fun")
      def lib(filename, data = nil)
        log :lib, filename
        data ||= yield if block_given?
        create_file("lib/#{filename}", optimize_indentation(data), verbose: false)
      end

      # Create a new +Rakefile+ with the provided code (either in a block or a string).
      #
      #   rakefile("bootstrap.rake") do
      #     project = ask("What is the UNIX name of your project?")
      #
      #     <<-TASK
      #       namespace :#{project} do
      #         task :bootstrap do
      #           puts "I like boots!"
      #         end
      #       end
      #     TASK
      #   end
      #
      #   rakefile('seed.rake', 'puts "Planting seeds"')
      def rakefile(filename, data = nil)
        log :rakefile, filename
        data ||= yield if block_given?
        create_file("lib/tasks/#{filename}", optimize_indentation(data), verbose: false)
      end

      # Create a new initializer with the provided code (either in a block or a string).
      #
      #   initializer("globals.rb") do
      #     data = ""
      #
      #     ['MY_WORK', 'ADMINS', 'BEST_COMPANY_EVAR'].each do |const|
      #       data << "#{const} = :entp\n"
      #     end
      #
      #     data
      #   end
      #
      #   initializer("api.rb", "API_KEY = '123456'")
      def initializer(filename, data = nil)
        log :initializer, filename
        data ||= yield if block_given?
        create_file("config/initializers/#{filename}", optimize_indentation(data), verbose: false)
      end

      # Generate something using a generator from Rails or a plugin.
      # The second parameter is the argument string that is passed to
      # the generator or an Array that is joined.
      #
      #   generate(:authenticated, "user session")
      def generate(what, *args)
        log :generate, what

        options = args.extract_options!
        options[:abort_on_failure] = !options[:inline]

        rails_command "generate #{what} #{args.join(" ")}", options
      end

      # Runs the supplied rake task (invoked with 'rake ...')
      #
      #   rake("db:migrate")
      #   rake("db:migrate", env: "production")
      #   rake("gems:install", sudo: true)
      #   rake("gems:install", capture: true)
      def rake(command, options = {})
        execute_command :rake, command, options
      end

      # Runs the supplied rake task (invoked with 'rails ...')
      #
      #   rails_command("db:migrate")
      #   rails_command("db:migrate", env: "production")
      #   rails_command("gems:install", sudo: true)
      #   rails_command("gems:install", capture: true)
      def rails_command(command, options = {})
        if options[:inline]
          log :rails, command
          command, *args = Shellwords.split(command)
          in_root do
            silence_warnings do
              ::Rails::Command.invoke(command, args, **options)
            end
          end
        else
          execute_command :rails, command, options
        end
      end

      # Make an entry in Rails routing file <tt>config/routes.rb</tt>
      #
      #   route "root 'welcome#index'"
      #   route "root 'admin#index'", namespace: :admin
      def route(routing_code, namespace: nil)
        namespace = Array(namespace)
        namespace_pattern = route_namespace_pattern(namespace)
        routing_code = namespace.reverse.reduce(routing_code) do |code, name|
          "namespace :#{name} do\n#{rebase_indentation(code, 2)}end"
        end

        log :route, routing_code

        in_root do
          if namespace_match = match_file("config/routes.rb", namespace_pattern)
            base_indent, *, existing_block_indent = namespace_match.captures.compact.map(&:length)
            existing_line_pattern = /^[ ]{,#{existing_block_indent}}\S.+\n?/
            routing_code = rebase_indentation(routing_code, base_indent + 2).gsub(existing_line_pattern, "")
            namespace_pattern = /#{Regexp.escape namespace_match.to_s}/
          end

          inject_into_file "config/routes.rb", routing_code, after: namespace_pattern, verbose: false, force: false

          if behavior == :revoke && namespace.any? && namespace_match
            empty_block_pattern = /(#{namespace_pattern})((?:\s*end\n){1,#{namespace.size}})/
            gsub_file "config/routes.rb", empty_block_pattern, verbose: false, force: true do |matched|
              beginning, ending = empty_block_pattern.match(matched).captures
              ending.sub!(/\A\s*end\n/, "") while !ending.empty? && beginning.sub!(/^[ ]*namespace .+ do\n\s*\z/, "")
              beginning + ending
            end
          end
        end
      end

      # Reads the given file at the source root and prints it in the console.
      #
      #   readme "README"
      def readme(path)
        log File.read(find_in_source_paths(path))
      end

      private
        # Define log for backwards compatibility. If just one argument is sent,
        # invoke say, otherwise invoke say_status. Differently from say and
        # similarly to say_status, this method respects the quiet? option given.
        def log(*args) # :doc:
          if args.size == 1
            say args.first.to_s unless options.quiet?
          else
            args << (behavior == :invoke ? :green : :red)
            say_status(*args)
          end
        end

        # Runs the supplied command using either "rake ..." or "rails ..."
        # based on the executor parameter provided.
        def execute_command(executor, command, options = {}) # :doc:
          log executor, command
          sudo = options[:sudo] && !Gem.win_platform? ? "sudo " : ""
          config = {
            env: { "RAILS_ENV" => (options[:env] || ENV["RAILS_ENV"] || "development") },
            verbose: false,
            capture: options[:capture],
            abort_on_failure: options[:abort_on_failure],
          }

          in_root { run("#{sudo}#{extify(executor)} #{command}", config) }
        end

        # Add an extension to the given name based on the platform.
        def extify(name) # :doc:
          if Gem.win_platform?
            "#{name}.bat"
          else
            name
          end
        end

        # Always returns value in double quotes.
        def quote(value) # :doc:
          if value.respond_to? :each_pair
            return value.map do |k, v|
              "#{k}: #{quote(v)}"
            end.join(", ")
          end
          return value.inspect unless value.is_a? String

          "\"#{value.tr("'", '"')}\""
        end

        # Returns optimized string with indentation
        def optimize_indentation(value, amount = 0) # :doc:
          return "#{value}\n" unless value.is_a?(String)
          "#{value.strip_heredoc.indent(amount).chomp}\n"
        end
        alias rebase_indentation optimize_indentation

        # Indent the +Gemfile+ to the depth of @indentation
        def indentation # :doc:
          "  " * @indentation
        end

        # Manage +Gemfile+ indentation for a DSL action block
        def with_indentation(&block) # :doc:
          @indentation += 1
          instance_eval(&block)
        ensure
          @indentation -= 1
        end

        # Append string to a file with a newline if necessary
        def append_file_with_newline(path, str, options = {})
          gsub_file path, /\n?\z/, options do |match|
            match.end_with?("\n") ? "" : "\n#{str}\n"
          end
        end

        def match_file(path, pattern)
          File.read(path).match(pattern) if File.exist?(path)
        end

        def route_namespace_pattern(namespace)
          namespace.each_with_index.reverse_each.reduce(nil) do |pattern, (name, i)|
            cummulative_margin = "\\#{i + 1}[ ]{2}"
            blank_or_indented_line = "^[ ]*\n|^#{cummulative_margin}.*\n"
            "(?:(?:#{blank_or_indented_line})*?^(#{cummulative_margin})namespace :#{name} do\n#{pattern})?"
          end.then do |pattern|
            /^([ ]*).+\.routes\.draw do[ ]*\n#{pattern}/
          end
        end
    end
  end
end