Reuse gettext gem to parse .po file

I am working on a translation service which requires translating .po file (ruby gettext gem). Spent hours to understand the rake tasks it provides and looked for methods to extract all String inside .po file. Finally found the parser and the method to do my job:

require 'gettext/tools/poparser'
require 'gettext/tools/rmsgmerge'

parser = GetText::PoParser.new
result = parser.parse_file("...../my_rails_project/po/en/text_domain.po", GetText::RMsgMerge::PoData.new, false)

the object representing the data structure is assigned to result.

In case you are also extending gettext library, check the gettext/tools directory. Most of the useful methods are located there.