Make Gems with Bundler

1. Init gem project

$ rvm install ruby-<version>  e.g. $ rvm install ruby-2.2.3
$ rvm use 2.2.3@<gemset> --create
$ gem install bundler
$ gem install pry
$ bundle gem <gemname>

2. Fill out <gemname>.gemspec, especially descriptions

# Only with ruby 2.0.x
spec.required_ruby_version = '>= 2'                  =

3. Setup dev and runtime dependencies in <gemname>.gemspec file, RSpec for example

s.add_development_dependency "rspec-rails"
# s.add_development_dependency 'factory_girl_rails'

s.add_dependency 'activesupport'

4. Setup RSpec

$ rspec --init

# Create a spec, for example spec/foobar_spec.rb:
mkdir spec/tests
touch spec/tests/foo_spec.rb

# rspec spec/tests/foo_spec.rb
describe "Gem_Name" do
  pending "write it"

# add to .rspec
--format documentation
--require spec_helper

# add requires to spec_helper.rb
require 'simplecov'
require 'timecop'
require 'pry'

# Run spec
$ rspec spec/tests/foo_spec.rb

5. Set git remote using git remote add origin <url>

$ git remote add origin

6. Get hackin’, add ROOT constant for navigation

module MyGem
  extend self

  def root
    @@root ||="my_gem").gem_dir)

7. Once everything is TDDed, bump the version and rake relase

8. Troubleshooting

Sometimes rake release will hang.
Do a gem push first to get rubygems creditentials set up.


Written on November 5, 2015