Create ruby gem step by step with bundler

1. Yura Tolstik
Ruby/Rails developer at Altoros Development
t witter: @yltsrc
email: yltsrc@gmail.com

2. Extracting ruby gem
Why?
Reusable code
Easy to install
Easy to share

3. Lets start
Find code duplications
Write tests if not exists
Ready?

4. How to create
creating a gem
specification file
(mygem.gemspec) bundle gem mygem
and do all things
by hand...

5. By hand?

6. mygem.gemspec
Gem::Specification.new do |s|
s.name = "mygem"
s.version = Mygem::VERSION
s.authors = ["Yura Tolstik"]
s.email = ["yltsrc@gmail.com"]
s.homepage = "http://github.com/yltsrc/mygem"
s.summary = %q{My first gem}
s.description = %q{Create ruby gem step by step with bundler}
s.license = "MIT"
s.files = `git ls-files`.split("n")
s.test_files = `git ls-files -- spec/*`.split("n")
s.require_paths = ["lib"]
s.add_development_dependency "rake"
s.add_development_dependency "rspec"
end

7. spec_helper.rb
$LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
$LOAD_PATH.unshift(File.dirname(__FILE__))
require 'rspec'
require 'newgem'
RSpec.configure do |config|
# if needed
end

8. Extract tests
describe "Mygem" do
describe "#hello" do
it "should return 'Hello world!'" do
@base = ""
@base.extend(Mygem::Base)
@base.hello.should eql("Hello world!")
end
end
end

9. Extract methods
module Mygem
module Base
def hello
"Hello #{self.empty? ? 'world' : self}!"
end
end
end

10. Rakefile
require "bundler/gem_tasks"
require 'rspec/core'
require 'rspec/core/rake_task'
RSpec::Core::RakeTask.new(:spec) do |spec|
spec.pattern = FileList['spec/**/*_spec.rb']
end
task :default => :spec

11. Test
rake spec

12. Build
rake build
or
gem build mygem.gemspec

13. Publish
rake release
or
gem push mygem-0.0.1.gem

14. My own gem server
gem help generate_index
gem help server

15. Questions
http://gembundler.com/rubygems.html
http://docs.rubygems.org/read/chapter/20