1 files changed, 23 insertions, 0 deletions
diff --git a/lib/util.rb b/lib/util.rb
index 873b6f9..5509aad 100644
--- a/lib/util.rb
+++ b/lib/util.rb
@@ -87,3 +87,26 @@ end
 def path_to asset_id
   P.path_to asset_id
 end
+
+def normalize title
+  title.downcase.gsub /[[:punct:]]|[[:space:]]/, ''
+end
+
+def indexify title
+  alphabet = "aąbcćdeęfghijklłmnńoóprsśtuwyzźż".chars
+  normalized = normalize title
+  normalized.chars.map do |c|
+    index = alphabet.find_index c
+    if index.nil?
+      raise "Letter not in alphabet: #{c}"
+    end
+
+    index
+  end
+end
+
+def polish_compare a, b
+  indices_a = indexify a
+  indices_b = indexify b
+  indices_a <=> indices_b
+end