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Refactor Darkfish implementation #1300
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Extracted from #1300 These things are not currently used by anything. Please review by commits.
    
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Discovered when working on #1300 Currently we need to call `setup` in individual generation methods, despite having already called it in `RDoc#generate`. This is because `setup` is lazily called when we run `ri`'s server mode. By calling `setup` eagerly in `Servlet#generator_for`, we can avoid the repeated calls to `setup` in individual generation methods. Right now we can NOT move `setup` into `Darkfish#initialize` yet because `ri`'s server can[ initialize `Darkfish` with `nil` store](https://github.com/ruby/rdoc/blob/master/lib/rdoc/servlet.rb#L335).
Under the current implementation, the template variables are captured through the `render_template` method's block. This makes it hard to understand if a variable is intended to be used in the template or not. This commit changes the `render_template` method to require passing a hash of local variables to the template. This makes the variable scope explicit and easier to reason about.
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| template = template_for template_file, true, erb_klass | ||
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| @context = binding | 
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Isn’t it possible that the template accidentally affects the variables of this method?
  
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Notable changes:
Avoid using block binding to capture template variables
Under the current implementation, the template variables are captured
through the
render_templatemethod's block. This makes it hard tounderstand if a variable is intended to be used in the template or not.
This commit changes the
render_templatemethod to require passinga hash of local variables to the template. This makes the variable
scope explicit and easier to reason about.