Parent class for command-line subcommand plugins for the installer. Each subclass must implement the command class method and should provide help text using the help method. Example (from Typo):

  class SweepCache < RailsInstaller::Command
    help "Sweep Typo's cache"

    def self.command(installer, *args)
     installer.sweep_cache
    end
  end

This implements a sweep_cache command that Typo users can access by running ‘typo sweep_cache /some/path’.

Subcommands that need arguments should use both ‘help’ and ‘flag_help’, and then use the args parameter to find their arguments. For example, the install subcommand looks like this:

  class Install < RailsInstaller::Command
    help "Install or upgrade APPNAME in PATH."
    flag_help "[VERSION] [KEY=VALUE]..."

    def self.command(installer, *args)
      version = nil
      args.each do |arg|
        ...
      end
    end
  end