Rakefile in phonetics-1.1.1 vs Rakefile in phonetics-1.5.0

@@ -1,6 +1,25 @@
-require "bundler/gem_tasks"
-require "rspec/core/rake_task"
+require 'bundler/gem_tasks'
+require 'rake/extensiontask'
+require 'rspec/core/rake_task'
+
+Rake::ExtensionTask.new('c_levenshtein') do |extension|
+  extension.ext_dir = 'ext/c_levenshtein'
+  extension.lib_dir = 'lib/phonetics'
+end
+
+PHONETIC_COST_C_EXTENSION = File.expand_path('ext/c_levenshtein/phonetic_cost.c', __dir__)
+
+namespace :compile do
+  desc 'Write phonetic_cost.c using Phonetic values'
+  task :phonetic_cost do
+    require_relative './lib/phonetics'
+    file = File.open(PHONETIC_COST_C_EXTENSION, 'w')
+    Phonetics.generate_phonetic_cost_c_code(file)
+    puts "Wrote #{PHONETIC_COST_C_EXTENSION}"
+  end
+end
+task compile: 'compile:phonetic_cost'
 
 RSpec::Core::RakeTask.new(:spec)
 
 task :default => :spec