1 files changed, 39 insertions, 0 deletions
diff --git a/lib/core_ext/json.rb b/lib/core_ext/json.rb
new file mode 100644
index 0000000..3b08a04
--- /dev/null
+++ b/lib/core_ext/json.rb
@@ -0,0 +1,39 @@
+module JSON
+  #
+  # Output JSON from ruby objects in such a manner that all the hashes and arrays are output in alphanumeric sorted order.
+  # This is required so that our generated configs don't throw puppet or git for a tizzy fit.
+  #
+  # Beware: some hacky stuff ahead.
+  #
+  # This relies on the pure ruby implementation of JSON.generate (i.e. require 'json/pure')
+  # see https://github.com/flori/json/blob/master/lib/json/pure/generator.rb
+  #
+  # The Oj way that we are not using: Oj.dump(obj, :mode => :compat, :indent => 2)
+  #
+  def self.sorted_generate(obj)
+    # modify hash and array
+    Hash.class_eval do
+      alias_method :each_without_sort, :each
+      def each(&block)
+        keys.sort {|a,b| a.to_s <=> b.to_s }.each do |key|
+          yield key, self[key]
+        end
+      end
+    end
+    Array.class_eval do
+      alias_method :each_without_sort, :each
+      def each(&block)
+        sort {|a,b| a.to_s <=> b.to_s }.each_without_sort &block
+      end
+    end
+
+    # generate json
+    json_str = JSON.pretty_generate(obj)
+
+    # restore hash and array
+    Hash.class_eval  {alias_method :each, :each_without_sort}
+    Array.class_eval {alias_method :each, :each_without_sort}
+
+    return json_str
+  end
+end