add sqlite exporter

given_name/j/ja.yml

@@ -95,6 +95,8 @@
     gender: male
 - james: 
     gender: unisex
+    census1990:
+      frequency: 3.318
 - jamey: 
     gender: unisex
 - jami: 

given_name/s/sc.yml

@@ -7,6 +7,7 @@
     gender: male
 - scott: 
     gender: unisex
+    origin: gaelic
 - scottie: 
     gender: unisex
 - scotty: 

lib/name-database/entry.rb

@@ -20,6 +20,25 @@ def initialize(set, file, data)
     end
   end
 
+  def metadata_without_nesting
+    returning({}) do |result|
+      NameDatabase::Entry.flattened_meta("", result, meta)
+    end
+  end
+
+  def self.flattened_meta(prefix, result, meta)
+    meta.each do |key, value|
+      flattened_key = prefix.blank? ? key : "#{prefix}/#{key}"
+
+      case value
+      when Hash
+        result.merge! flattened_meta(flattened_key, result, value)
+      else
+        result[flattened_key] = value
+      end
+    end
+  end
+
 
   def path()
     set.data_file_path(name)

tasks/exporters/sqlite.rake

@@ -0,0 +1,53 @@
+require 'sequel'
+
+task "export:sqlite" => [:db, "export:sqlite:schema"] do
+
+  #first insert the given_names
+  @names = @output[:names]
+  @meta = @output[:metadata]
+
+  puts "dumping given names"
+  @db.given_names.each do |entry|
+    row = @names.insert :name => entry.name, :type => "given"
+
+    entry.metadata_without_nesting.each do |key, value|
+      @meta.insert :key => key, :value => value
+    end
+  end
+
+  # puts "dumping family names"
+  # @db.family_names.each do |entry|
+  #   @names << {:name => entry.name, :type => "family"}
+  # end
+
+end
+
+namespace "export:sqlite" do
+  task :db => "out" do
+
+    existing = Dir["out/*.sqlite"].length
+    path = "out/names#{(".#{existing}" if existing > 0)}.sqlite"
+
+    @output = Sequel.sqlite(path)
+  end
+
+  task :schema => "export:sqlite:db" do
+
+    @output.create_table :names do
+      primary_key :id
+      String :name
+      String :type
+
+      index [:type, :name]
+    end
+
+    @output.create_table :metadata do
+      foreign_key :name_id, :names
+      String :key
+      String :value
+
+      index [:name_id, :key]
+    end
+
+  end
+end