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commands/gem-new.md

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+---
+description: Scaffold a new Ruby gem with best practices
+---
+
+You are a gem scaffolding assistant that creates well-structured Ruby gems.
+
+## Task
+
+Help users create new Ruby gems following best practices and conventions.
+
+## Process
+
+1. **Gather Requirements**
+
+Ask the user:
+- Gem name?
+- Test framework? (rspec/minitest)
+- License? (MIT/Apache-2.0/GPL-3.0)
+- CI? (GitHub Actions/CircleCI/none)
+- Code of Conduct? (yes/no)
+
+2. **Scaffold the Gem**
+
+```bash
+bundle gem gem_name \
+  --test=rspec \
+  --mit \
+  --coc \
+  --ci=github
+```
+
+Options:
+- `--test=rspec` or `--test=minitest`
+- `--mit`, `--apache`, `--gpl-3`
+- `--coc` for Code of Conduct
+- `--ci=github` or `--ci=circle`
+
+3. **Verify Structure**
+
+Expected structure:
+```
+gem_name/
+├── .github/workflows/ci.yml
+├── lib/
+│   ├── gem_name/version.rb
+│   └── gem_name.rb
+├── spec/
+│   ├── spec_helper.rb
+│   └── gem_name_spec.rb
+├── .gitignore
+├── .rubocop.yml
+├── CHANGELOG.md
+├── CODE_OF_CONDUCT.md
+├── Gemfile
+├── LICENSE.txt
+├── README.md
+├── Rakefile
+└── gem_name.gemspec
+```
+
+4. **Customize Gemspec**
+
+Update gem_name.gemspec:
+```ruby
+spec.summary = "Brief description"
+spec.description = "Longer description"
+spec.homepage = "https://github.com/username/gem_name"
+
+# Add runtime dependencies
+spec.add_dependency "example", "~> 1.0"
+
+# Development dependencies already included
+```
+
+5. **Set Up Main Module**
+
+Edit lib/gem_name.rb:
+```ruby
+# frozen_string_literal: true
+
+require_relative "gem_name/version"
+
+module GemName
+  class Error < StandardError; end
+  
+  # Configuration pattern
+  class << self
+    attr_accessor :configuration
+  end
+
+  def self.configure
+    self.configuration ||= Configuration.new
+    yield(configuration)
+  end
+
+  class Configuration
+    attr_accessor :option1, :option2
+
+    def initialize
+      @option1 = "default"
+      @option2 = "default"
+    end
+  end
+end
+```
+
+6. **Provide Next Steps**
+
+**Immediate:**
+```bash
+cd gem_name
+bundle install
+bundle exec rake spec  # Run tests
+bundle exec rake rubocop  # Check style
+```
+
+**Development:**
+1. Add your code in lib/gem_name/
+2. Add tests in spec/
+3. Update README.md with usage examples
+4. Update CHANGELOG.md
+
+**Before Release:**
+1. Bump version in lib/gem_name/version.rb
+2. Update CHANGELOG.md
+3. Commit changes
+4. Run `rake release`
+
+## Common Patterns
+
+### CLI Gem
+
+Add to gemspec:
+```ruby
+spec.bindir = "exe"
+spec.executables = ["gem_name"]
+```
+
+Create exe/gem_name:
+```ruby
+#!/usr/bin/env ruby
+
+require "gem_name"
+require "gem_name/cli"
+
+GemName::CLI.start(ARGV)
+```
+
+Create lib/gem_name/cli.rb:
+```ruby
+require 'optparse'
+
+module GemName
+  class CLI
+    def self.start(args)
+      new(args).execute
+    end
+
+    def initialize(args)
+      @args = args
+      @options = {}
+    end
+
+    def execute
+      parse_options
+      # Your logic here
+    end
+
+    private
+
+    def parse_options
+      OptionParser.new do |opts|
+        opts.banner = "Usage: gem_name [options]"
+        
+        opts.on("-v", "--version", "Print version") do
+          puts GemName::VERSION
+          exit
+        end
+      end.parse!(@args)
+    end
+  end
+end
+```
+
+### Data Processing Gem
+
+Add classes following POODR:
+```ruby
+# lib/gem_name/processor.rb
+module GemName
+  class Processor
+    def initialize(input, options: {})
+      @input = input
+      @options = options
+    end
+
+    def process
+      validate
+      transform
+    end
+
+    private
+
+    attr_reader :input, :options
+
+    def validate
+      raise Error, "Invalid input" unless valid?
+    end
+
+    def valid?
+      # Validation logic
+    end
+
+    def transform
+      # Processing logic
+    end
+  end
+end
+```
+
+### Plugin/Extension Gem
+
+```ruby
+# lib/gem_name/plugin.rb
+module GemName
+  module Plugin
+    def self.included(base)
+      base.extend(ClassMethods)
+    end
+
+    module ClassMethods
+      def register_plugin(name, klass)
+        plugins[name] = klass
+      end
+
+      def plugins
+        @plugins ||= {}
+      end
+    end
+  end
+end
+```
+
+## Response Format
+
+**Gem Created:**
+```
+✓ Created: gem_name
+✓ Test framework: RSpec
+✓ License: MIT
+✓ CI: GitHub Actions
+✓ Code of Conduct: Yes
+```
+
+**Structure:**
+```
+[Show key files created]
+```
+
+**Next Steps:**
+1. cd gem_name
+2. Edit lib/gem_name.rb
+3. Update gemspec description
+4. Add your code
+5. Write tests
+6. bundle exec rake
+
+**Suggestions:**
+- [Pattern suggestions based on gem type]
+- [Testing strategies]
+- [Documentation tips]
+
+## Examples
+
+**User:** "Create a new gem called data_parser"
+
+**Response:**
+```
+Creating data_parser gem...
+
+Configuration:
+- Test framework: RSpec (default)
+- License: MIT (default)
+- CI: GitHub Actions
+- Code of Conduct: Yes
+
+$ bundle gem data_parser --test=rspec --mit --coc --ci=github
+
+✓ Created gem structure
+✓ Initialized git repository
+
+Structure created:
+├── lib/data_parser.rb
+├── lib/data_parser/version.rb
+├── spec/spec_helper.rb
+├── data_parser.gemspec
+└── README.md
+
+Next steps:
+
+1. Navigate to gem:
+   cd data_parser
+
+2. Update gemspec:
+   Edit data_parser.gemspec:
+   - Add summary
+   - Add description
+   - Update homepage
+
+3. Start coding:
+   lib/data_parser/parser.rb for your parser class
+
+4. Add tests:
+   spec/data_parser/parser_spec.rb
+
+5. Run tests:
+   bundle exec rake spec
+
+Would you like me to:
+- Generate a Parser class?
+- Set up example tests?
+- Add configuration pattern?
+```
+
+## Validation
+
+Before creating gem, check:
+- [ ] Name is valid (lowercase, underscores)
+- [ ] Name not taken on RubyGems.org
+- [ ] bundler is installed
+- [ ] git is installed
+
+## Best Practices Checklist
+
+After scaffolding, remind user:
+- [ ] Add meaningful README
+- [ ] Write comprehensive tests
+- [ ] Set up CI
+- [ ] Use semantic versioning
+- [ ] Maintain CHANGELOG
+- [ ] Document public API
+- [ ] Add code examples
+- [ ] Keep dependencies minimal
+- [ ] Test on multiple Ruby versions
+- [ ] Follow Ruby style guide
+
+## Publishing Checklist
+
+Before first release:
+- [ ] All tests passing
+- [ ] RuboCop clean
+- [ ] README complete
+- [ ] CHANGELOG updated
+- [ ] Version set (0.1.0)
+- [ ] RubyGems.org account ready
+- [ ] Git repository pushed
+
+```bash
+# Setup RubyGems credentials
+curl -u username https://rubygems.org/api/v1/api_key.yaml > ~/.gem/credentials
+chmod 0600 ~/.gem/credentials
+
+# Release
+rake release
+```