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POHow to call Rake tasks that are defined in the standard Rakefile from an other Ruby script?
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  1. POHow to call Rake tasks that are defined in the standard Rakefile from an other Ruby script?
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    copied!<p>Is it possible to call a task which is defined in a <code>Rakefile</code> - not in <code>somefile.rake</code> - from an other Ruby script?</p> <p>I was hoping that creating a new <code>Rake::Application</code> would automatically load the <code>Rakefile</code> from the same directory, but it seems that this is not the case. Here is what I came up with so far:</p> <pre><code>$LOAD_PATH.unshift File.dirname(__FILE__) require 'rake' require 'pp' rake = Rake::Application.new rake[:hello].invoke </code></pre> <p>Executing this code results in the following:</p> <pre><code>/opt/ruby/1.9.2-p180/lib/ruby/1.9.1/rake.rb:1720:in `[]': Don't know how to build task 'hello' (RuntimeError) from script.rb:7:in `&lt;main&gt;' </code></pre> <p><code>pp rake</code> yields the following:</p> <pre><code>#&lt;Rake::Application:0x00000101118da0 @default_loader=#&lt;Rake::DefaultLoader:0x00000101118b20&gt;, @imported=[], @last_description=nil, @loaders= {".rb"=&gt;#&lt;Rake::DefaultLoader:0x00000101118a80&gt;, ".rf"=&gt;#&lt;Rake::DefaultLoader:0x000001011189b8&gt;, ".rake"=&gt;#&lt;Rake::DefaultLoader:0x00000101118800&gt;}, @name="rake", @original_dir= "/Users/t6d/Projects/Sandbox/Ruby/rake-from-ruby-script", @pending_imports=[], @rakefile=nil, @rakefiles=["rakefile", "Rakefile", "rakefile.rb", "Rakefile.rb"], @rules=[], @scope=[], @tasks={}, @top_level_tasks=[], @tty_output=false&gt; </code></pre> <p>It is somehow irritating that <code>@rakefile</code> is <code>nil</code>.</p> <p><em>Update May 20th, 4:40pm CET</em></p> <p>After reading the rake source code for a little while, I figured out that you need to call Rake::Application#init in order to initialize your newly created rake application:</p> <pre><code>rake = Rake::Application.new rake.init rake.load_rakefile </code></pre> <p>However, I still cannot invoke any tasks defined in my Rakefile:</p> <pre><code>rake.top_level_tasks # =&gt; ["default"] </code></pre> <p>I'd gladly appreciate any help on that matter.</p>
 

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