How to create a Gem in Ruby

Getting Started

first all, we'll do it in linux OS and use us bundle.

you should install rbenv for to work with ruby, for this example use the ruby version 2.6.3 open your console and type

$ ruby -v
# => 2.6.3

next, we need to install bundle

$ gem install bundle

we check that it is install with

$ bundle -v
#=> Bundler version 2.0.2

Create your gem

next step, we need to select a name for our gem, you can follow the basic recomendations to do it, and for create the gem is very easy, just type.

$ **bundle gem name-your-gem **

there is some thing that you should answer before to create your gem,

$ Do you want to generate tests with your gem? rspec
$ Do you want to license your code permissively under the MIT license? y
$ Do you want to include a code of conduct in gems you generate? y

Setting up .Gemspec

and it is all. you have a gem but you need to configure the file .gemspec

spec.name = "name-your-gem"
spec.authors = ["your name"]
spec.email = ["your email [email protected]"]
spec.summary = "Summary"
spec.description = "description"
spec.homepage = "your repo in github"
spec.license = "MIT"
spec.metadata["source_code_uri"] = "your github"
spec.metadata["changelog_uri"] = "your github"

Finally

you principal code you should put in lib/name-your-gem.rb

and you proof TDD should put it in spec/name-your-gem.spec

finally you can do your gem exec with

$ gem build name-your-gem.gemspec

RubyGems

to post your gem in RubyGems

$ gem push name-your-gem.gem