user.gemspec The gemspec defines what's in the gem, who made it, and the version of gem. It's also your interface to RubyGems.org
Gem::Specification.new do |s|
s.name = "user_greeting"
s.version = "0.0.1"
s.summary = "User Greeting"
s.description = "Greet the user!"
s.authors = ["Bikash Shrestha"]
s.email = "[email protected]"
s.files = Dir["lib/*.rb"]
s.homepage = "https://rubygems.org/gems/user_greeting"
s.license = "MIT"
end
lib/user.rb
class User
def self.greet name
puts "Hello, #{name}"
end
end
.
├── lib
│ └── user.rb
├── .ruby-version
└── user.gemspec
rbenv local 3.1.2 -> this creates .ruby-version file
After you've created a gemspec, you can build a ruby gem from it. Then you can install the generated gem locally to test it out.
To build gem run: gem build user.gemspec
To install gem run: gem install user_greeting-0.0.1.gem
Of course, the smoke test isn't over yet: the final step is to require the gem and use it:
$ irb
irb(main):004:0> require "user"
=> false
irb(main):005:0> User.greet "Bikash Shrestha"
Hello, Bikash Shrestha
=> nil
To publish your gem, you'll need to create an account on RubyGems.org.
After creating an account, you can push your gem to RubyGems.org using the following commands:
Sign in using gem signin (this will ask your email/username and password on command prompt)
gem push user_greeting-0.0.1.gem
Install your gem : gem install user_greeting
Crafting and Publishing Your Ruby Gem