How to call Rake tasks that are defined in the standard Rakefile from an other Ruby script?

Question

Is it possible to call a task which is defined in a Rakefile - not in somefile.rake - from an other Ruby script?

I was hoping that creating a n

Answer 1

You forgot to add your new rake to the current Rake Application:

$LOAD_PATH.unshift File.dirname(__FILE__)

require 'rake'
require 'pp'

rake = Rake::Application.new
Rake.application = rake
rake.init
rake.load_rakefile

rake[:hello].invoke

or just

$LOAD_PATH.unshift File.dirname(__FILE__)
require 'rake'
require 'pp'

Rake.application.init
Rake.application.load_rakefile

Rake.application[:hello].invoke

Answer 2

Just load the Rakefile:

==> foo.rb <==
require 'rubygems'
require 'rake'

load 'Rakefile'

Rake::Task[:some_task].invoke

==> Rakefile <==
task :some_task do
  puts "some_task"
end

Rake::Application is all about command-line processing, default rakefiles, output, etc. You might not need any of that.