创键 gem

1. 生成工程目录

bundle gem mytest
Creating gem 'mytest'...
MIT License enabled in config
Code of conduct enabled in config
      create  mytest/Gemfile
      create  mytest/lib/mytest.rb
      create  mytest/lib/mytest/version.rb
      create  mytest/mytest.gemspec
      create  mytest/Rakefile
      create  mytest/README.md
      create  mytest/bin/console
      create  mytest/bin/setup
      create  mytest/.gitignore
      create  mytest/LICENSE.txt
      create  mytest/CODE_OF_CONDUCT.md
Initializing git repo in /Users/steve/Desktop/mytest

2. 编辑 mytest.gemspec

（1）origin：

lib = File.expand_path("../lib", __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require "mytest/version"

Gem::Specification.new do |spec|
  spec.name          = "mytest"
  spec.version       = Mytest::VERSION
  spec.authors       = ["steve"]
  spec.email         = ["chengquan.wang@ele.me"]

  spec.summary       = %q{TODO: Write a short summary, because RubyGems requires one.}
  spec.description   = %q{TODO: Write a longer description or delete this line.}
  spec.homepage      = "TODO: Put your gem's website or public repo URL here."
  spec.license       = "MIT"

  # Prevent pushing this gem to RubyGems.org. To allow pushes either set the 'allowed_push_host'
  # to allow pushing to a single host or delete this section to allow pushing to any host.
  if spec.respond_to?(:metadata)
    spec.metadata["allowed_push_host"] = "TODO: Set to 'http://mygemserver.com'"
  else
    raise "RubyGems 2.0 or newer is required to protect against " \
      "public gem pushes."
  end

  spec.files         = `git ls-files -z`.split("\x0").reject do |f|
    f.match(%r{^(test|spec|features)/})
  end
  spec.bindir        = "exe"
  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
  spec.require_paths = ["lib"]

  spec.add_development_dependency "bundler", "~> 1.16"
  spec.add_development_dependency "rake", "~> 10.0"
end

其中包含 TODO || FIXME 标记的必须改为你个人的工程信息
（2）modified：

lib = File.expand_path("../lib", __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require "mytest/version"

Gem::Specification.new do |spec|
  spec.name          = "mytest"
  spec.version       = Mytest::VERSION
  spec.authors       = ["CNKCQ"]
  spec.email         = ["chengquan.personal@gmail.com"]

  spec.summary       = %q{happy setting}
  spec.description   = %q{effective command for boot setting}
  spec.homepage      = "https://github.com/CNKCQ/mytest.git"
  spec.license       = "MIT"

  # Prevent pushing this gem to RubyGems.org. To allow pushes either set the 'allowed_push_host'
  # to allow pushing to a single host or delete this section to allow pushing to any host.
  if spec.respond_to?(:metadata)
    spec.metadata["allowed_push_host"] = "https://rubygems.org"
  else
    raise "RubyGems 2.0 or newer is required to protect against " \
      "public gem pushes."
  end

  spec.files         = `git ls-files -z`.split("\x0").reject do |f|
    f.match(%r{^(test|spec|features)/})
  end
  # Mac os  bindir = "bin"  Windows  bindir = "exe"
  spec.bindir        = "bin"
  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
  spec.require_paths = ["lib"]

  spec.add_runtime_dependency "colorize"

  spec.add_development_dependency "bundler", "~> 1.16"
  spec.add_development_dependency "rake", "~> 10.0"
  spec.add_development_dependency "colorize"
  spec.add_development_dependency "rspec", "~> 3.2"
end

其中在不同的系统中执行文件的目录（bindir）是不同的，我用的 macOS, 所以使用 bin 目录

3. 版本控制 (VERSION)
   编辑 mytest/lib/mytest/version.rb 可以更改版本号

module MyGem
 VERSION = '0.0.1'
end

4. 执行代码
   编辑 mytest/lib/mytest/mytest.rb ， 可以在里面添加执行代码

require "mytest/version"

module Mytest
  # Your code goes here...
  put 'hello my first gem'
end

5. 依赖管理 Gemfile
   编辑 mytest/Gemfile ， 可以在这里进行依赖管理

source "https://rubygems.org"

git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }

# Specify your gem's dependencies in mytest.gemspec
gemspec

6. Testing our gem

$ bundle install

获取 RubyGems 账户

1. 注册并登陆 RubyGems 账户
2. 生成 RubyGems 账户的访问令牌

$ curl -u your-rubygems-username https://rubygems.org/api/v1/api_key.yaml > ~/.gem/credentials

如果 “获取 RubyGems 账户” 没有做，下面发布的过程中会报错：

$ rake release
mytest 0.0.1 built to pkg/mytest-0.0.1.gem.
Tag v0.0.1 has been created.
rake aborted!
Your rubygems.org credentials aren't set. Run `gem push` to set them.

Tasks: TOP => release
(See full trace by running task with --trace)

发布 gem

rake build

build 结束后提交到 git 仓库后执行：

rake release

发布成功， 恭喜你生成了一个自己的 gem

Reference

• Create a ruby gem
• Easily publish your ruby gems
• Developing a RubyGem using Bundler