Allow creating slugs for emoji characters.

lib/jekyll-archives/archive.rb

@@ -33,7 +33,7 @@ def initialize(site, title, type, posts)
 
         # Generate slug if tag or category
         # (taken from jekyll/jekyll/features/support/env.rb)
-        @slug = Utils.slugify(title) if title.is_a? String
+        @slug = Utils.slugify(title, :mode => slug_mode) if title.is_a? String
 
         # Use ".html" for file extension and url for path
         @ext  = File.extname(relative_path)
@@ -118,6 +118,13 @@ def relative_path
         path
       end
 
+      # Return the mode to use for generating slugs.
+      #
+      # Returns a symbol or nil.
+      def slug_mode
+        @config["slug_mode"].to_sym if @config["slug_mode"]
+      end
+
       # Returns the object as a debug String.
       def inspect
         "#<Jekyll:Archive @type=#{@type} @title=#{@title} @data=#{@data.inspect}>"

test/source/_posts/2018-11-05-pretty-slugs.md

@@ -0,0 +1,6 @@
+---
+title: Pretty Slugs
+category: 💎
+---
+
+Post with 💎 category.

test/test_jekyll_archives.rb

@@ -48,6 +48,22 @@ class TestJekyllArchives < Minitest::Test
     end
   end
 
+  context "the jekyll-archives plugin with a custom slug mode" do
+    setup do
+      @site = fixture_site("jekyll-archives" => {
+        "slug_mode" => "pretty",
+        "enabled"   => true,
+      })
+      @site.read
+      @archives = Jekyll::Archives::Archives.new(@site.config)
+    end
+
+    should "generate slugs using the mode specified" do
+      @archives.generate(@site)
+      assert archive_exists? @site, "category/💎/index.html"
+    end
+  end
+
   context "the jekyll-archives plugin with custom layout path" do
     setup do
       @site = fixture_site("jekyll-archives" => {
@@ -116,7 +132,7 @@ class TestJekyllArchives < Minitest::Test
     end
 
     should "populate the {{ site.archives }} tag in Liquid" do
-      assert_equal 12, read_file("length.html").to_i
+      assert_equal 16, read_file("length.html").to_i
     end
   end