Optimize indentation for generator actions

[yhirano55]

Summary

I've found that indentations are broken on environment method that is generator's one of actions.

Example template

environment "config.x.a = 1"
environment "config.x.b = 2"
environment do
  <<~RUBY
    config.x.c = 3
    config.x.d = 4
    config.x.e = 5
  RUBY
end

environment "config.x.a = 1", env: "development"
environment "config.x.b = 2", env: "development"
environment nil, env: "development" do
  <<~RUBY
    config.x.c = 3
    config.x.d = 4
    config.x.e = 5
  RUBY
end

Command

$ bin/rails app:template LOCATION=./template.rb

Before

It seems that it's not supported to be used on multiple lines.

$ git diff
diff --git a/config/application.rb b/config/application.rb
index f150d0f..41ae6f8 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -8,6 +8,12 @@ Bundler.require(*Rails.groups)

 module Foobar
   class Application < Rails::Application
+    config.x.c = 3
+config.x.d = 4
+config.x.e = 5
+
+    config.x.b = 2
+    config.x.a = 1
     # Initialize configuration defaults for originally generated Rails version.
     config.load_defaults 5.1

diff --git a/config/environments/development.rb b/config/environments/development.rb
index 2c15c69..f6b467c 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -1,4 +1,10 @@
 Rails.application.configure do
+  config.x.c = 3
+config.x.d = 4
+config.x.e = 5
+
+  config.x.b = 2
+  config.x.a = 1
   # Settings specified here will take precedence over those in config/application.rb.

   # In the development environment your application's code is reloaded on

After

$ git diff
diff --git a/config/application.rb b/config/application.rb
index f150d0f..2254e12 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -8,6 +8,11 @@ Bundler.require(*Rails.groups)

 module Foobar
   class Application < Rails::Application
+    config.x.c = 3
+    config.x.d = 4
+    config.x.e = 5
+    config.x.b = 2
+    config.x.a = 1
     # Initialize configuration defaults for originally generated Rails version.
     config.load_defaults 5.1

diff --git a/config/environments/development.rb b/config/environments/development.rb
index 2c15c69..bf1d891 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -1,4 +1,9 @@
 Rails.application.configure do
+  config.x.c = 3
+  config.x.d = 4
+  config.x.e = 5
+  config.x.b = 2
+  config.x.a = 1
   # Settings specified here will take precedence over those in config/application.rb.

   # In the development environment your application's code is reloaded on

Other Information

This is my use case.

application do
  <<~RUBY
    config.encoding  = "utf-8"
    config.time_zone = "UTC"
    config.active_record.default_timezone = :utc
    config.autoload_paths   += %W(\#{config.root}/lib)
    config.eager_load_paths += %W(\#{config.root}/lib)
  RUBY
end

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