CoCalc provides the best real-time collaborative environment for Jupyter Notebooks, LaTeX documents, and SageMath, scalable from individual users to large groups and classes!

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require 'pstore'
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require 'forwardable'
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module Anemone
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  module Storage
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    class PStore
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      extend Forwardable
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      def_delegators :@keys, :has_key?, :keys, :size
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      def initialize(file)
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        File.delete(file) if File.exist?(file)
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        @store = ::PStore.new(file)
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        @keys = {}
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      end
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      def [](key)
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        @store.transaction { |s| s[key] }
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      end
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      def []=(key,value)
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        @keys[key] = nil
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        @store.transaction { |s| s[key] = value }
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      end
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      def delete(key)
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        @keys.delete(key)
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        @store.transaction { |s| s.delete key}
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      end
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      def each
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        @keys.each_key do |key|
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          value = nil
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          @store.transaction { |s| value = s[key] }
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          yield key, value
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        end
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      end
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      def merge!(hash)
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        @store.transaction do |s|
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          hash.each { |key, value| s[key] = value; @keys[key] = nil }
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        end
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        self
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      end
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      def close; end
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    end
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  end
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end
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