Make posts limit configurable (#314)

Merge pull request 314

README.md

@@ -151,6 +151,15 @@ feed:
     - updates
 ```
 
+## Posts limit
+
+By default the plugin limits the number of posts in the feed to 10. Simply define a new limit in your config:
+
+```yml
+feed:
+  posts_limit: 20
+```
+
 ## Collections
 
 Jekyll Feed can generate feeds for collections other than the Posts collection. This works best for chronological collections (e.g., collections with dates in the filenames). Simply define which collections you'd like feeds for in your config:

lib/jekyll-feed/feed.xml

@@ -43,7 +43,8 @@
   {% if page.category %}
     {% assign posts = posts | where: "category",page.category %}
   {% endif %}
-  {% for post in posts limit: 10 %}
+  {% assign posts_limit = site.feed.posts_limit | default: 10 %}
+  {% for post in posts limit: posts_limit %}
     <entry{% if post.lang %}{{" "}}xml:lang="{{ post.lang }}"{% endif %}>
       {% assign post_title = post.title | smartify | strip_html | normalize_whitespace | xml_escape %}
 

spec/jekyll-feed_spec.rb

@@ -534,4 +534,24 @@
       end
     end
   end
+
+  context "with feed.posts_limit set to 2" do
+    let(:overrides) do
+      { "feed" => { "posts_limit" => 2 } }
+    end
+
+    it "puts the latest 2 the posts in the feed.xml file" do
+      expect(contents).to_not match "http://example.org/news/2013/12/12/dec-the-second.html"
+      expect(contents).to_not match "http://example.org/news/2014/03/02/march-the-second.html"
+      expect(contents).to_not match "http://example.org/updates/jekyll/2014/03/04/march-the-fourth.html"
+      expect(contents).to_not match "http://example.org/2015/01/18/jekyll-last-modified-at.html"
+      expect(contents).to_not match "http://example.org/2015/02/12/strip-newlines.html"
+      expect(contents).to_not match "http://example.org/2015/05/12/liquid.html"
+      expect(contents).to_not match "http://example.org/2015/05/12/pre.html"
+      expect(contents).to_not match "http://example.org/2015/05/18/author-detail.html"
+
+      expect(contents).to match "http://example.org/2015/08/08/stuck-in-the-middle.html"
+      expect(contents).to match "http://example.org/2016/04/25/author-reference.html"
+    end
+  end
 end