Add metadata files

.gitignore

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+*.gem
+*.rbc
+/.config
+/coverage/
+/InstalledFiles
+/pkg/
+/spec/reports/
+/test/tmp/
+/test/version_tmp/
+/tmp/
+
+## Specific to RubyMotion:
+.dat*
+.repl_history
+build/
+
+## Documentation cache and generated files:
+/.yardoc/
+/_yardoc/
+/doc/
+/rdoc/
+
+## Environment normalisation:
+/.bundle/
+/lib/bundler/man/
+
+# for a library or gem, you might want to ignore these files since the code is
+# intended to run in multiple environments; otherwise, check them in:
+Gemfile.lock
+.ruby-version
+.ruby-gemset
+
+# unless supporting rvm < 1.11.0 or doing something fancy, ignore this:
+.rvmrc

Gemfile

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+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in activemodel-ipaddr_validator.gemspec
+gemspec

README.md

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+# activemodel-ipaddr_validator
+
+## Usage
+
+Add to your Gemfile:
+
+```rb
+gem 'activemodel-ipaddr_validator'
+```
+
+Run:
+
+```
+bundle install
+```
+
+Then add the following to your model:
+
+```rb
+validates :my_ipaddr_attribute, ipaddr: true
+```
+
+### Custom options
+
+Name    | Value   | Default | Description
+--------|---------|---------|-------------------------------------
+`ipv4`  | Boolean | true    | Accept IPv4.
+`ipv6`  | Boolean | false   | Accept IPv6.
+`array` | Boolean | false   | Expect an array of strings.
+
+```rb
+validates :ipv6s_attribute, ipaddr: { array: true, ipv4: false, ipv6: true }
+serialize :ipv6s_attribute, Array
+```
+
+## Validation outside a model
+
+If you need to validate a IP outside a model, you can do that:
+
+```rb
+IpaddrValidator.valid?(value, options)
+```

Rakefile

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+require 'bundler/gem_tasks'
+require 'rspec/core/rake_task'
+
+RSpec::Core::RakeTask.new('spec')
+task default: :spec

activemodel-ipaddr_validator.gemspec

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+file = File.open(File.expand_path('../lib/ipaddr_validator/version.rb', __FILE__))
+version = file.read.scan(/\d+\.\d+\.\d+/).first
+file.close
+
+Gem::Specification.new do |spec|
+  spec.name            = 'activemodel-ipaddr_validator'
+  spec.version         = version
+  spec.authors         = ['Yuku Takahashi']
+  spec.email           = ['yuku@qiita.com']
+  spec.summary         = 'A IPv4 and IPv6 validator for Rails 3 and 4.'
+  spec.homepage        = 'https://github.com/increments/activemodel-ipaddr_validator'
+  spec.license         = 'MIT'
+
+  spec.files           = `git ls-files -z`.split("\x0")
+  spec.require_paths   = ['lib']
+
+  spec.add_dependency 'activemodel'
+
+  spec.add_development_dependency 'bundler', '~> 1.7'
+  spec.add_development_dependency 'rake', '~> 10.0'
+  spec.add_development_dependency 'rspec'
+end

lib/activemodel-ipaddr_validator.rb

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+require 'ipaddr_validator/version'

lib/ipaddr_validator/version.rb

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+class IpaddrValidator
+  VERSION = '0.0.0'
+end

spec/spec_helper.rb

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+RSpec.configure do |config|
+  config.color = true
+  config.run_all_when_everything_filtered = true
+end