A simple CLI for interactively creating a new gem with `bundler`

newgem

#!/usr/bin/env ruby
#
# $ ./newgem example
# Add binary executable? no
# Add code of conduct file? no
# Add MIT license? Yes
# Add native extension? (none)
# Add test library? rspec
# Add linter library? standard
# Add continuous integration config? (none)
# $ bundler gem example --no-exe --no-coc --mit --no-ext --test=rspec --linter=standard --no-ci
# Creating gem 'example'...
# MIT License enabled in config
# Changelog enabled in config
# Standard enabled in config
# Initializing git repo in /Users/kevinrobell/Desktop/example
#       create  example/Gemfile
#       create  example/lib/example.rb
#       create  example/lib/example/version.rb
#       create  example/sig/example.rbs
#       create  example/example.gemspec
#       create  example/Rakefile
#       create  example/README.md
#       create  example/bin/console
#       create  example/bin/setup
#       create  example/.gitignore
#       create  example/.rspec
#       create  example/spec/spec_helper.rb
#       create  example/spec/example_spec.rb
#       create  example/LICENSE.txt
#       create  example/CHANGELOG.md
#       create  example/.standard.yml
# Gem 'example' was successfully created. For more information on making a RubyGem visit https://bundler.io/guides/creating_gem.html

USAGE = <<~USAGE
usage: newgem GEM_NAME

Interactive CLI to create a new gem with `bundler`.
USAGE

case ARGV.size
when 0
  puts USAGE
  exit 0
when 1
  GEM_NAME = ARGV.first
  if GEM_NAME.empty?
    puts USAGE
    puts
    puts "Error: empty gem name"
    exit 1
  end
else
  puts USAGE
  exit 1
end

require "English"
require "bundler/inline"

gemfile do
  source "https://rubygems.org"

  gem "tty-prompt"
end

flags = []

prompt = TTY::Prompt.new

if prompt.yes?("Add binary executable?")
  flags << "--exe"
else
  flags << "--no-exe"
end

if prompt.yes?("Add code of conduct file?")
  flags << "--coc"
else
  flags << "--no-coc"
end

if prompt.yes?("Add MIT license?")
  flags << "--mit"
else
  flags << "--no-mit"
end

case prompt.select("Add native extension?", %w[c rust (none)])
when "c"
  flags << "--ext=c"
when "rust"
  flags << "--ext=rust"
else
  flags << "--no-ext"
end

case prompt.select("Add test library?", %w[rspec minitest test-unit (none)])
when "rspec"
  flags << "--test=rspec"
when "minitest"
  flags << "--test=minitest"
when "test-unit"
  flags << "--test=test-unit"
else
  flags << "--no-test"
end

case prompt.select("Add linter library?", %w[rubocop standard (none)])
when "rubocop"
  flags << "--linter=rubocop"
when "standard"
  flags << "--linter=standard"
else
  flags << "--no-linter"
end

case prompt.select("Add continuous integration config?", %w[github gitlab circle (none)])
when "github"
  flags << "--ci=github"
when "gitlab"
  flags << "--ci=gitlab"
when "circle"
  flags << "--ci=circle"
else
  flags << "--no-ci"
end

command = ["bundler", "gem", GEM_NAME, *flags]
puts "$ #{command.join(" ")}"
system(*command)

exit $CHILD_STATUS.exitstatus