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# frozen_string_literal: true
require 'openssl'
module I18n
module Backend
# Overwrites the Base load_file method to cache loaded file contents.
module CacheFile
# Optionally provide path_roots array to normalize filename paths,
# to make the cached i18n data portable across environments.
attr_accessor :path_roots
protected
# Track loaded translation files in the `i18n.load_file` scope,
# and skip loading the file if its contents are still up-to-date.
def load_file(filename)
initialized = !respond_to?(:initialized?) || initialized?
key = I18n::Backend::Flatten.escape_default_separator(normalized_path(filename))
old_mtime, old_digest = initialized && lookup(:i18n, key, :load_file)
return if (mtime = File.mtime(filename).to_i) == old_mtime ||
(digest = OpenSSL::Digest::SHA256.file(filename).hexdigest) == old_digest
super
store_translations(:i18n, load_file: { key => [mtime, digest] })
end
# Translate absolute filename to relative path for i18n key.
def normalized_path(file)
return file unless path_roots
path = path_roots.find(&file.method(:start_with?)) ||
raise(InvalidLocaleData.new(file, 'outside expected path roots'))
file.sub(path, path_roots.index(path).to_s)
end
end
end
end
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