find_unused_strings.rb

find_unused_strings.rb

#!/usr/bin/env ruby

require 'rexml/document'
require 'rexml/xpath'
require 'yaml'
require 'pp'

strings = 'res/values/strings.xml'
unused_yaml = 'unused.yaml'

doc = REXML::Document.new(File.new(strings))

names, unused = [], []
if File.exists?(unused_yaml)
  unused = YAML.load_file(unused_yaml)
else
  REXML::XPath.match(doc, '//string | //plurals').each do |e|
    names << e.attribute('name').to_s
  end

  names.each do |n|
    ret = system  "ack 'R\.(string|plurals).#{n}' --type=java -1 src &>/dev/null"
    if !ret
        ret = system "ack '@(string|plurals)/#{n}' --type=xml -1 AndroidManifest.xml res &>/dev/null"
        if !ret
          unused << n
        end
      end
  end
  File.open(unused_yaml, 'w') { |f| f<<YAML.dump(unused) }
end

REXML::XPath.match(doc, '//string | //plurals').each do |e|
  name = e.attribute('name').to_s
  if unused.include? name
    e.parent.delete e
  end
end

puts doc.to_s