How do I run Rake tasks within a Ruby script?

Question

I have a Rakefile with a Rake task that I would normally call from the command line:

rake blog:post Title

I'd like to write a Ruby script that calls that Rake task multiple times, but the only solution I see is shelling out using `` (backticks) or system.

What's the right way to do this?

Answer 1

from timocracy.com:

require 'rake'

def capture_stdout
  s = StringIO.new
  oldstdout = $stdout
  $stdout = s
  yield
  s.string
ensure
  $stdout = oldstdout
end

Rake.application.rake_require 'metric_fetcher', ['../../lib/tasks']
results = capture_stdout {Rake.application['metric_fetcher'].invoke}