Merge pull request #17 from nebulab/nirebu/file-publisher

Add a static file publisher

README.md

@@ -119,7 +119,7 @@ need custom configuration on a per-publisher basis.
 
 SolidusFeeds.config.register :all_products do |feed|
   feed.generator = SolidusFeeds::Generators::GoogleMerchant.new(Spree::Product.all)
-  feed.publisher = SolidusFeeds::Puslishers::S3.new(
+  feed.publisher = SolidusFeeds::Publishers::S3.new(
     bucket: "foo",
     object_key: "bar/my_feed.xml",
     client: Aws::S3::Client.new(…), # This is optional - use only if a custom config is needed
@@ -131,7 +131,23 @@ end
 
 ### ActiveStorage
 ### Rails cache
+
 ### Static file
+
+To publish the feed directly from an app directory (e.g. the `public` directory), you can use the
+Static File Publisher as such:
+
+```ruby
+# config/initializers/solidus_feeds.rb
+
+SolidusFeeds.config.register :all_products do |feed|
+  feed.generator = SolidusFeeds::Generators::GoogleMerchant.new(Spree::Product.all)
+  feed.publisher = SolidusFeeds::Publishers::StaticFile.new(
+    path: Rails.root.join('public/products.xml')
+  )
+end
+```
+
 ### FTP
 
 ## Builtin Marketplace format generators

lib/solidus_feeds.rb

@@ -8,5 +8,6 @@
 require 'solidus_feeds/engine'
 
 require 'solidus_feeds/publishers/s3'
+require 'solidus_feeds/publishers/static_file'
 
 require 'solidus_feeds/generators/google_merchant'

lib/solidus_feeds/publishers/static_file.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+module SolidusFeeds
+  module Publishers
+    class StaticFile
+      attr_reader :path
+
+      def initialize(path:)
+        @path = path
+      end
+
+      def call
+        File.open(path, 'w') do |file|
+          yield file
+        end
+      end
+    end
+  end
+end

spec/lib/solidus_feeds/publishers/static_file_spec.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require 'csv'
+
+RSpec.describe SolidusFeeds::Publishers::StaticFile do
+  let(:filename) { 'my_feed.csv' }
+  let(:io) { StringIO.new }
+  let(:generator) {
+    ->(io) {
+      csv = CSV.new(io)
+      csv << ["some", "data"]
+      csv << ["another", "line"]
+    }
+  }
+
+  describe '#call' do
+    it 'saves the generated content to the specified file' do
+      buffer = StringIO.new
+      allow(File).to receive(:open).with(filename, 'w').and_yield(buffer)
+      static_file_publisher = described_class.new(path: filename)
+
+      static_file_publisher.call do |io|
+        generator.call(io)
+      end
+
+      expect(buffer.string).to eq(
+        "some,data\nanother,line\n"
+      )
+    end
+  end
+end