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# frozen_string_literal: true
module FakeFS
# Kernel Module
module Kernel
@captives = { original: {}, hijacked: {} }
class << self
attr_accessor :captives
end
def self.hijack!
captives[:hijacked].each do |name, prc|
::Kernel.send(:remove_method, name.to_sym)
::Kernel.send(:define_method, name.to_sym, &prc)
::Kernel.send(:private, name.to_sym)
end
end
def self.unhijack!
captives[:original].each_key do |name|
::Kernel.send(:remove_method, name.to_sym)
::Kernel.send(:define_method, name.to_sym, proc do |*args, **kwargs, &block|
::FakeFS::Kernel.captives[:original][name].call(*args, **kwargs, &block)
end)
::Kernel.send(:private, name.to_sym)
end
end
# NOTE: maybe private
def self.hijack(name, &block)
captives[:original][name] = ::Kernel.method(name.to_sym)
captives[:hijacked][name] = block || proc { |_args| }
end
hijack :open do |*args, &block|
# This is a system command or we're inside IRB internals
if args.first.start_with?('|') || self.class.to_s.start_with?("IRB::")
::FakeFS::Kernel.captives[:original][:open].call(*args, &block)
else
name = args.shift
FakeFS::File.open(name, *args, &block)
end
end
end
end
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