I have made rails_datamapper a gem

rails_datamapper/History.txt

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+=== 0.9.11 / not released
+
+  * Made a gem

rails_datamapper/LICENSE

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+Copyright (c) 2008 Tom Malone
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

rails_datamapper/Manifest.txt

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+History.txt
+LICENSE
+Manifest.txt
+README.txt
+Rakefile
+TODO
+lib/rails_datamapper.rb
+lib/rails_datamapper/rails_datamapper.rb
+lib/rails_datamapper/version.rb
+generators/dm_model/dm_model_generator.rb
+generators/dm_model/templates/migration.rb
+generators/dm_model/templates/model.rb
+generators/dm_model/templates/unit_test.rb
+generators/rspec_dm_model/rspec_dm_model_generator.rb
+generators/rspec_dm_model/templates/model.rb
+generators/rspec_dm_model/templates/model_spec.rb

rails_datamapper/README.txt

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+This is a Rails plugin that provides datamapper as an orm
+
+== Setup
+
+add the following line to your projects environment.rb
+
+config.gem "rails_datamapper"
+
+== Generators
+
+Two generators are added by default
+
+script/generate dm_model
+script/generate rspec_dm_model
+
+These by default add an active record migrations but you can call
+
+script/generate dm_model --skip-migration
+script/generate rspec_dm_model --skip-migration
+
+To avoid any dependency on active record add this to your projects environment.rb
+
+config.frameworks -= [ :active_record ]  
+
+== Future
+I really should sort out migrations but with rails3 round the corner don't hold your breath

rails_datamapper/Rakefile

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+require 'pathname'
+require 'rubygems'
+
+ROOT    = Pathname(__FILE__).dirname.expand_path
+JRUBY   = RUBY_PLATFORM =~ /java/
+WINDOWS = Gem.win_platform?
+SUDO    = (WINDOWS || JRUBY) ? '' : ('sudo' unless ENV['SUDOLESS'])
+
+require ROOT + 'lib/rails_datamapper/version'
+
+AUTHOR = 'Tom Malone'
+EMAIL  = 'tomjmalone [a] gmail [d] com'
+GEM_NAME = 'rails_datamapper'
+GEM_VERSION = DataMapper::RailsDatamapper::VERSION
+GEM_DEPENDENCIES = [['dm-core', "~>#{GEM_VERSION}"]]
+GEM_CLEAN = %w[ pkg ]
+GEM_EXTRAS = { :has_rdoc => false, :extra_rdoc_files => %w[ README.txt LICENSE TODO History.txt ] }
+
+PROJECT_NAME = 'datamapper'
+PROJECT_URL  = "http://github.com/sam/dm-more/tree/master/#{GEM_NAME}"
+PROJECT_DESCRIPTION = PROJECT_SUMMARY = 'Rails Plugin for datamapper'
+
+[ ROOT, ROOT.parent ].each do |dir|
+  Pathname.glob(dir.join('tasks/**/*.rb').to_s).each { |f| require f }
+end

rails_datamapper/lib/rails_datamapper.rb

@@ -1,45 +1,5 @@
-def config_file()
-  Rails.root + "/config/database.yml"
-end
-
-def create_connection()
-  conf = config.dup
-  repositories = conf.delete(:repositories)
-  ::DataMapper.setup(:default, conf) unless conf.empty?
-end
-
-def get_config_for_environment
-  if hash = full_config[RAILS_ENV]
-    symbolize_keys(hash)
-  elsif hash = full_config[RAILS_ENV.to_sym]
-    hash
-  else
-    raise ArgumentError, "missing environment '#{RAILS_ENV}' in config file #{config_file}"
-  end
-end
-
-def full_config
-  @full_config ||= YAML::load(ERB.new(IO.read(config_file)).result)
-end
-
-def config
-  @config ||= get_config_for_environment
-end
-
-def symbolize_keys(h)
-  config = {}
-
-  h.each do |k, v|
-    if k == 'port'
-      config[k.to_sym] = v.to_i
-    elsif k == 'adapter' && v == 'postgresql'
-      config[k.to_sym] = 'postgres'
-    elsif v.is_a?(Hash)
-      config[k.to_sym] = symbolize_keys(v)
-    else
-      config[k.to_sym] = v
-    end
-  end
-
-  config
-end
+gem 'dm-core', '~>0.9.11'
+require 'pathname'
+require 'dm-core'
+require Pathname(__FILE__).dirname.expand_path / 'rails_datamapper/rails_datamapper'
+create_connection()

rails_datamapper/lib/rails_datamapper/rails_datamapper.rb

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+def config_file()
+  Rails.root + "/config/database.yml"
+end
+
+def create_connection()
+  conf = config.dup
+  repositories = conf.delete(:repositories)
+  ::DataMapper.setup(:default, conf) unless conf.empty?
+end
+
+def get_config_for_environment
+  if hash = full_config[RAILS_ENV]
+    symbolize_keys(hash)
+  elsif hash = full_config[RAILS_ENV.to_sym]
+    hash
+  else
+    raise ArgumentError, "missing environment '#{RAILS_ENV}' in config file #{config_file}"
+  end
+end
+
+def full_config
+  @full_config ||= YAML::load(ERB.new(IO.read(config_file)).result)
+end
+
+def config
+  @config ||= get_config_for_environment
+end
+
+def symbolize_keys(h)
+  config = {}
+
+  h.each do |k, v|
+    if k == 'port'
+      config[k.to_sym] = v.to_i
+    elsif k == 'adapter' && v == 'postgresql'
+      config[k.to_sym] = 'postgres'
+    elsif v.is_a?(Hash)
+      config[k.to_sym] = symbolize_keys(v)
+    else
+      config[k.to_sym] = v
+    end
+  end
+
+  config
+end

rails_datamapper/lib/rails_datamapper/version.rb

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+module DataMapper
+  module RailsDatamapper
+    VERSION = '0.9.11'
+  end
+end

rails_datamapper/tasks/install.rb

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+def sudo_gem(cmd)
+  sh "#{SUDO} #{RUBY} -S gem #{cmd}", :verbose => false
+end
+
+desc "Install #{GEM_NAME} #{GEM_VERSION}"
+task :install => [ :package ] do
+  sudo_gem "install --local pkg/#{GEM_NAME}-#{GEM_VERSION} --no-update-sources"
+end
+
+desc "Uninstall #{GEM_NAME} #{GEM_VERSION}"
+task :uninstall => [ :clobber ] do
+  sudo_gem "uninstall #{GEM_NAME} -v#{GEM_VERSION} -Ix"
+end