Ruby on Rails full application template - ruby-on-rails

Question

I would like to create Rails application template, so when I run rails new it should:
override Gemfile (add gems, remove gems and those shitty comments etc.)
convert application layout file to HAML and edit its content
edit assets files to import bootstrap-sass files as required
edit and set my database variables in database.yml
maybe something else, dunno atm...
I just want it to be ready to go, I hope you can understand me so far.
How could I achieve this?
I know about rails composer, but I don't want to choose from these application templates, I want the one with constant set of tools I always use. I can commit new application to GitHub and then just run git clone on it each time with just changing my new project name, but is it the best solution?

Answer 1

You can use the awesome Rails feature Rails Application Templates, rails new project_name -m /path/to/template.rb
Here is my own template:
# minitest, capistrano, pry
gem_group :development do
gem 'puma'
gem 'capistrano', '2.15.5'
gem 'rvm-capistrano'
gem 'pry-rails', '~> 0.3.2'
end
gem_group :test do
gem 'minitest-rails'
gem 'letter_opener'
gem 'ffaker', require: false
end
run "bundle install"
#install minitest test_helper
generate 'mini_test:install'
environment "config.generators do |g|\n g.test_framework :mini_test, spec: true, fixture: true\n end"
#Add pride to minitest config
run "sed -i '' '4 s#^#require \"minitest/pride\"#' test/test_helper.rb"
#create postgres DB in postgresql
#development and test
run "psql -c 'CREATE DATABASE #{app_path}_development;'"
run "psql -c 'CREATE DATABASE #{app_path}_test;'"
#add database yml
run "sed -i '' '4 s#^#require \"minitest/pride\"#' test/test_helper.rb"
#Add minitest features to Rake task
run %q^echo 'MiniTest::Rails::Testing.default_tasks << "features"' >> Rakefile^
#Fix README.md
run "rm README.rdoc"
run "touch README.md"
#Initialize local Git repository and Initial Commit
git :init
git add: "."
git commit: "-a -m 'Initial commit :pray:'"