From fb42f4157c92eb35f54dd65425f1c7e6aca07389 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <m@m-chrzan.xyz>
Date: Thu, 26 Jan 2023 12:15:59 +0100
Subject: Sort by Polish alphabet

---
 lib/util.rb        | 23 +++++++++++++++++++++++
 src/index.html.erb |  4 ++--
 2 files changed, 25 insertions(+), 2 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
diff --git a/src/index.html.erb b/src/index.html.erb
index ca40664..f6be207 100644
--- a/src/index.html.erb
+++ b/src/index.html.erb
@@ -7,9 +7,9 @@
 </p>
 
 <ul id='songs'>
-<%- songs.keys.sort.each do |song_id| -%>
+<%- songs.values.sort { |a, b| polish_compare a.title, b.title }.each do |song| -%>
   <li>
-    <a href='<%= path_to (song_html song_id) %>'><%= songs[song_id].title %></a>
+    <a href='<%= path_to (song_html song.id) %>'><%= song.title %></a>
   </li>
 <%- end -%>
 </ul>
-- 
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