From 87a5e747fd6573dd1ebef0b48f523067d6270438 Mon Sep 17 00:00:00 2001
From: Marc Chung <mchung@gmail.com>
Date: Tue, 30 Dec 2008 11:33:22 -0700
Subject: [PATCH] Added array_to_sentence_string filter

---
 lib/jekyll/filters.rb | 17 ++++++++++++++++-
 test/test_filters.rb  | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 test/test_filters.rb

diff --git a/lib/jekyll/filters.rb b/lib/jekyll/filters.rb
index 6051626a..6cfa6361 100644
--- a/lib/jekyll/filters.rb
+++ b/lib/jekyll/filters.rb
@@ -19,6 +19,21 @@ module Jekyll
     
     def number_of_words(input)
       input.split.length
-    end    
+    end
+    
+    def array_to_sentence_string(array)
+      connector = "and"
+      case array.length
+      when 0
+        ""
+      when 1
+        array[0].to_s
+      when 2
+        "#{array[0]} #{connector} #{array[1]}"
+      else
+        "#{array[0...-1].join(', ')}, #{connector} #{array[-1]}"
+      end
+    end
+
   end  
 end
\ No newline at end of file
diff --git a/test/test_filters.rb b/test/test_filters.rb
new file mode 100644
index 00000000..442cbc9e
--- /dev/null
+++ b/test/test_filters.rb
@@ -0,0 +1,32 @@
+require File.dirname(__FILE__) + '/helper'
+
+class TestSite < Test::Unit::TestCase
+  
+  class JekyllFilter
+    include Jekyll::Filters
+  end
+  
+  def setup
+    @filter = JekyllFilter.new
+  end
+
+  def test_array_to_sentence_string_with_no_args
+    assert_equal "", @filter.array_to_sentence_string([])
+  end
+
+  def test_array_to_sentence_string_with_one_arg
+    assert_equal "1", @filter.array_to_sentence_string([1])
+    assert_equal "chunky", @filter.array_to_sentence_string(["chunky"])
+  end
+  
+  def test_array_to_sentence_string_with_two_args
+    assert_equal "1 and 2", @filter.array_to_sentence_string([1, 2])
+    assert_equal "chunky and bacon", @filter.array_to_sentence_string(["chunky", "bacon"])
+  end
+  
+  def test_array_to_sentence_string_with_multiple_args
+    assert_equal "1, 2, 3, and 4", @filter.array_to_sentence_string([1, 2, 3, 4])
+    assert_equal "chunky, bacon, bits, and pieces", @filter.array_to_sentence_string(["chunky", "bacon", "bits", "pieces"])
+  end
+  
+end
\ No newline at end of file