Create JSON feed

README.md

@@ -1,6 +1,6 @@
 # Jekyll Feed plugin
 
-A Jekyll plugin to generate an Atom (RSS-like) feed of your Jekyll posts
+A Jekyll plugin to generate an Atom (RSS-like) feed and a [JSON feed](https://jsonfeed.org/version/1) of your Jekyll posts
 
 [![Build Status](https://travis-ci.org/jekyll/jekyll-feed.svg)](https://travis-ci.org/jekyll/jekyll-feed) [![Gem Version](https://badge.fury.io/rb/jekyll-feed.svg)](https://badge.fury.io/rb/jekyll-feed)
 
@@ -21,7 +21,7 @@ gems:
 
 ## Usage
 
-The plugin will automatically generate an Atom feed at `/feed.xml`.
+The plugin will automatically generate an Atom feed at `/feed.xml` and a [JSON feed](https://jsonfeed.org/) at `/feed.json`.
 
 ### Optional configuration options
 
@@ -39,6 +39,7 @@ Do you already have an existing feed someplace other than `/feed.xml`, but are o
 ```yml
 feed:
   path: atom.xml
+  json_path: json_feed.json
 ```
 
 To note, you shouldn't have to do this unless you already have a feed you're using, and you can't or wish not to redirect existing subscribers.

lib/jekyll-feed/feed.json

@@ -0,0 +1,72 @@
+{
+  "version": "https://jsonfeed.org/version/1",
+  {% assign site_title = site.title | site.name %}
+  {% if site_title %}
+    "title": {{ site_title | smartify | json }},
+  {% endif %}
+  {% if site.description %}
+    "description": {{ site.description | json }},
+  {% endif %}
+  "home_page_url": "{{ '/' | absolute_url }}",
+  "feed_url": "{{ page.url | absolute_url }}",
+  "icon": "{{ "/apple-touch-icon.png" | absolute_url }}",
+  "favicon": "{{ "/favicon.ico" | absolute_url }}",
+  "expired": false,
+  {% if site.author %}
+    "author": {
+      "name": {{ site.author.name | default: site.author | json }},
+      {% if site.author.uri %}
+        "url": {{ site.author.uri | json }}
+      {% endif %}
+    },
+  {% endif %}
+  "items": [
+    {% assign posts = site.posts | where_exp: "post", "post.draft != true" %}
+    {% for post in posts limit: 10 %}
+      {
+        "id": {{ post.id | absolute_url | json }},
+        "url": "{{ post.url | absolute_url }}",
+        "title": {{ post.title | smartify | strip_html | normalize_whitespace | json }},
+        {% if post.excerpt and post.excerpt != empty %}
+          {% assign post_summary = post.excerpt | strip_html | normalize_whitespace | json %}
+          "content_html": {{ post_summary }},
+          "summary": {{ post_summary }},
+        {% endif %}
+        {% assign post_image = post.image.path | default: post.image %}
+        {% if post_image %}
+          {% unless post_image contains "://" %}
+            {% assign post_image = post_image | absolute_url | xml_escape  %}
+          {% endunless %}
+          "image": "{{ post_image }}",
+        {% endif %}
+        "date_published": "{{ post.date | date_to_xmlschema }}",
+        "date_modified": "{{ post.last_modified_at | default: post.date | date_to_xmlschema }}",
+        {% assign post_author = post.author | default: post.authors[0] %}
+        {% if post_author %}
+          {% assign post_author = site.data.authors[post_author] | default: post_author %}
+          {% assign post_author_uri = post_author.uri | default: nil %}
+          {% assign post_author_name = post_author.name | default: post_author %}
+          "author": {
+            {% if post_author_name %}
+              "name": {{ post_author_name | json }},
+            {% endif %}
+            {% if post_author_uri %}
+              "url": {{ post_author_uri | json }}
+            {% endif %}
+          },
+        {% endif %}
+        {% if post.enclosure %}
+          "attachments": [
+            {
+              "url": "{{ post.enclosure }}",
+              "mime_type": "{{ post.enclosure_type }}",
+              "size_in_bytes": "{{ post.enclosure_length }}"
+            }
+          ],
+        {% endif %}
+        "tags": {{ post.tags | jsonify }}
+      }
+      {% unless forloop.last %},{% endunless %}
+    {% endfor %}
+  ]
+}

lib/jekyll-feed/generator.rb

@@ -6,8 +6,10 @@ class Generator < Jekyll::Generator
     # Main plugin action, called by Jekyll-core
     def generate(site)
       @site = site
-      return if file_exists?(feed_path)
-      @site.pages << content_for_file(feed_path, feed_source_path)
+
+      return if file_exists?(feed_path) && file_exists?(json_feed_path)
+      @site.pages << xml_content_for_file(feed_path, feed_source_path)
+      @site.pages << json_content_for_file(json_feed_path, feed_json_source_path)
     end
 
     private
@@ -27,11 +29,25 @@ def feed_path
       end
     end
 
+    # Path to JSON feed from config, or feed.json for default
+    def json_feed_path
+      if @site.config["feed"] && @site.config["feed"]["json_path"]
+        @site.config["feed"]["json_path"]
+      else
+        "feed.json"
+      end
+    end
+
     # Path to feed.xml template file
     def feed_source_path
       File.expand_path "./feed.xml", File.dirname(__FILE__)
     end
 
+    # Path to feed.json template file
+    def feed_json_source_path
+      File.expand_path "./feed.json", File.dirname(__FILE__)
+    end
+
     # Checks if a file already exists in the site source
     def file_exists?(file_path)
       if @site.respond_to?(:in_source_dir)
@@ -42,14 +58,31 @@ def file_exists?(file_path)
     end
 
     # Generates contents for a file
-    def content_for_file(file_path, file_source_path)
+    def content_for_file(file_path, file_source_path, regex)
       file = PageWithoutAFile.new(@site, File.dirname(__FILE__), "", file_path)
-      file.content = File.read(file_source_path).gsub(MINIFY_REGEX, "")
+      content = File.read(file_source_path)
+
+      if regex
+        content = content.gsub(regex, "")
+      end
+
+      file.content = content
       file.data["layout"] = nil
       file.data["sitemap"] = false
+      file
+    end
+
+    def xml_content_for_file(file_path, file_source_path)
+      file = content_for_file(file_path, file_source_path, MINIFY_REGEX)
       file.data["xsl"] = file_exists?("feed.xslt.xml")
       file.output
       file
     end
+
+    def json_content_for_file(file_path, file_source_path)
+      file = content_for_file(file_path, file_source_path, nil)
+      file.output
+      file
+    end
   end
 end