Sort releases (prometheus#1700)

2.19.3 was released after 2.20.0 but 2.20.0 should be the one displayed
on th website

Signed-off-by: Julien Pivotto <[email protected]>

Gemfile

@@ -9,6 +9,7 @@ gem 'nokogiri'
 gem 'redcarpet'
 gem 'pygments.rb'
 gem 'builder'
+gem 'semverse'
 gem 'rb-inotify', :require => false
 gem 'rb-fsevent', :require => false
 gem 'rb-fchange', :require => false

Gemfile.lock

@@ -126,6 +126,7 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.9.0)
     rspec-support (3.9.3)
+    semverse (3.0.0)
     shellany (0.0.1)
     slow_enumerator_tools (1.1.0)
     thor (1.0.1)
@@ -154,6 +155,7 @@ DEPENDENCIES
   rb-inotify
   redcarpet
   rspec
+  semverse
 
 BUNDLED WITH
    2.1.4

lib/helpers/download.rb

@@ -1,6 +1,7 @@
 require 'fileutils'
 require 'json'
 require 'open-uri'
+require 'semverse'
 
 module Downloads
   # repositories returns a list of all repositories with releases.
@@ -58,7 +59,28 @@ def self.checksum(release, name)
   class Repository
     def initialize(dir)
       @repo = JSON.parse(File.read(File.join(dir, 'repo.json')))
-      @releases = JSON.parse(File.read(File.join(dir, 'releases.json')))
+      @releases = JSON.parse(File.read(File.join(dir, 'releases.json'))).sort! do |a,b|
+        av = begin
+               Semverse::Version.new(a['tag_name'].sub('v',''))
+             rescue Semverse::InvalidVersionFormat
+               nil
+             end
+        bv = begin
+               Semverse::Version.new(b['tag_name'].sub('v',''))
+             rescue Semverse::InvalidVersionFormat
+               nil
+             end
+        case
+        when av.nil? || bv.nil?
+          0
+        when av < bv
+          1
+        when av > bv
+          -1
+        else
+          0
+        end
+      end
     end
 
     def name