Small macro to add ruby as an option to the generator with proper default
value plus an instance helper method called shebang.
# File railties/lib/rails/generators/base.rb, line 392
def self.add_shebang_option! # :doc:
class_option :ruby, type: :string, aliases: "-r", default: Thor::Util.ruby_command,
desc: "Path to the Ruby binary of your choice", banner: "PATH"
no_tasks {
define_method :shebang do
@shebang ||= begin
command = if options[:ruby] == Thor::Util.ruby_command
"/usr/bin/env #{File.basename(Thor::Util.ruby_command)}"
else
options[:ruby]
end
"#!#{command}"
end
end
}
end