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require 'active_support/core_ext/hash/keys'
module ClimateControl
class Modifier
def initialize(environment_overrides = {}, &block)
@environment_overrides = environment_overrides.dup.stringify_keys!
@block = block
end
def process
begin
prepare_environment_for_block
run_block
ensure
cache_environment_after_block
delete_keys_that_do_not_belong
revert_changed_keys
end
end
private
def prepare_environment_for_block
@original_env = clone_environment
copy_overrides_to_environment
@env_with_overrides_before_block = clone_environment
end
def run_block
@block.call
end
def copy_overrides_to_environment
@environment_overrides.each do |key, value|
ENV[key] = value
end
end
def keys_to_remove
@environment_overrides.keys
end
def keys_changed_by_block
@keys_changed_by_block ||= OverlappingKeysWithChangedValues.new(@env_with_overrides_before_block, @env_after_block).keys
end
def cache_environment_after_block
@env_after_block = clone_environment
end
def delete_keys_that_do_not_belong
(keys_to_remove - keys_changed_by_block).each {|key| ENV.delete(key) }
end
def revert_changed_keys
(@original_env.keys - keys_changed_by_block).each do |key|
ENV[key] = @original_env[key]
end
end
def clone_environment
ENV.to_hash
end
class OverlappingKeysWithChangedValues
def initialize(hash_1, hash_2)
@hash_1 = hash_1
@hash_2 = hash_2
end
def keys
overlapping_keys.select do |overlapping_key|
@hash_1[overlapping_key] != @hash_2[overlapping_key]
end
end
private
def overlapping_keys
@hash_2.keys & @hash_1.keys
end
end
end
end
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