brew/Library/Homebrew/dependable.rb

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require "options"
module Dependable
# `:run` and `:linked` are no longer used but keep them here to avoid them being
# misused in future.
RESERVED_TAGS = [:build, :optional, :recommended, :run, :test, :linked].freeze
def build?
tags.include? :build
end
def optional?
tags.include? :optional
end
def recommended?
tags.include? :recommended
end
def test?
tags.include? :test
end
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def required?
!build? && !test? && !optional? && !recommended?
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end
def option_tags
tags - RESERVED_TAGS
end
def options
Options.create(option_tags)
end
def prune_from_option?(build)
return if !optional? && !recommended?
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build.without?(self)
end
def prune_if_build_and_not_dependent?(dependent, formula = nil)
return false unless build?
return dependent.installed? unless formula
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dependent != formula
end
end