remove existing download files in generation

lib/tasks/generate_downloads.rake

@@ -6,33 +6,41 @@ require 'cgi'
 
 desc 'Generate download pages from the downloads json file'
 task :generate_downloads do
-  template = <<-EOF
-  ---
-  layout: download
-  title: "<%= id %> Download"
-  name: "<%= id %>"
-  version: "<%= attributes["version"] %>"
-  manufacturer: "<%= attributes["manufacturer"] %>"
-  downloads: "<%= attributes["downloads"] %>"
-  board_url: "<%= attributes["board_url"] %>"
-  board_image: "<%= attributes["board_image"] %>"
-  description: "<%= attributes["description"] %>"
-  files:
-    <%- attributes["files"].each do |file| -%>
-    "<%= file[0] %>": "<%= file[1] %>"
-    <%- end -%>
-  permalink: "/download/<%= CGI.escape(id) %>/"
-  ---
-  EOF
+
+template = <<-EOF
+---
+layout: download
+title: "<%= id %> Download"
+name: "<%= id %>"
+version: "<%= attributes["version"] %>"
+manufacturer: "<%= attributes["manufacturer"] %>"
+downloads: "<%= attributes["downloads"] %>"
+board_url: "<%= attributes["board_url"] %>"
+board_image: "<%= attributes["board_image"] %>"
+description: "<%= attributes["description"] %>"
+files:
+  <%- attributes["files"].each do |file| -%>
+  "<%= file[0] %>": "<%= file[1] %>"
+  <%- end -%>
+permalink: "/download/<%= CGI.escape(id) %>/"
+---
+EOF
 
   erb = ERB.new(template, nil, '-')
 
+
+
   downloads = File.read(File.join(File.dirname(__FILE__), '../../_data/downloads.json'))
   downloads = JSON.parse(downloads)
 
+  path = File.dirname(__FILE__), '../../_downloads/'
+
+  # delete existing files
+  Dir.glob(File.join(path, '/*.md')).each { |file| File.delete(file)}
+
   downloads["data"].each do |download|
-    path = File.join(File.dirname(__FILE__), '../../_downloads/', "#{CGI.escape(download["id"])}.md")
-    File.open(path, 'w') do |f|
+    file = File.join(path, "#{CGI.escape(download["id"])}.md")
+    File.open(file, 'w') do |f|
       f.write erb.result_with_hash(download)
     end
   end