104 lines
2.8 KiB
Ruby
104 lines
2.8 KiB
Ruby
module Vagrant
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module Action
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# This class manages hooks into existing {Builder} stacks, and lets you
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# add and remove middleware classes. This is the primary method by which
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# plugins can hook into built-in middleware stacks.
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class Hook
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# This is a hash of the middleware to prepend to a certain
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# other middleware.
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#
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# @return [Hash<Class, Array<Class>>]
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attr_reader :before_hooks
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# This is a hash of the middleware to append to a certain other
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# middleware.
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#
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# @return [Hash<Class, Array<Class>>]
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attr_reader :after_hooks
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# This is a list of the hooks to just prepend to the beginning
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#
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# @return [Array<Class>]
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attr_reader :prepend_hooks
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# This is a list of the hooks to just append to the end
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#
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# @return [Array<Class>]
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attr_reader :append_hooks
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def initialize
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@before_hooks = Hash.new { |h, k| h[k] = [] }
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@after_hooks = Hash.new { |h, k| h[k] = [] }
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@prepend_hooks = []
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@append_hooks = []
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end
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# Add a middleware before an existing middleware.
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#
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# @param [Class] existing The existing middleware.
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# @param [Class] new The new middleware.
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def before(existing, new)
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@before_hooks[existing] << new
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end
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# Add a middleware after an existing middleware.
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#
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# @param [Class] existing The existing middleware.
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# @param [Class] new The new middleware.
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def after(existing, new)
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@after_hooks[existing] << new
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end
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# Append a middleware to the end of the stack. Note that if the
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# middleware sequence ends early, then the new middleware won't
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# be run.
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#
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# @param [Class] new The middleware to append.
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def append(new)
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@append_hooks << new
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end
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# Prepend a middleware to the beginning of the stack.
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#
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# @param [Class] new The new middleware to prepend.
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def prepend(new)
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@prepend_hooks << new
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end
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# This applies the given hook to a builder. This should not be
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# called directly.
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#
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# @param [Builder] builder
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def apply(builder)
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# Prepends first
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@prepend_hooks.each do |klass|
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builder.insert(0, klass)
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end
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# Appends
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@append_hooks.each do |klass|
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builder.use(klass)
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end
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# Before hooks
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@before_hooks.each do |key, list|
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next if !builder.index(key)
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list.each do |klass|
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builder.insert_before(key, klass)
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end
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end
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# After hooks
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@after_hooks.each do |key, list|
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next if !builder.index(key)
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list.each do |klass|
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builder.insert_after(key, klass)
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end
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end
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end
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end
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end
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end
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