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# frozen_string_literal: true
require_relative "../command"
require_relative "../package"
require_relative "../version_option"
class Gem::Commands::BuildCommand < Gem::Command
  include Gem::VersionOption
  def initialize
    super "build", "Build a gem from a gemspec"
    add_platform_option
    add_option "--force", "skip validation of the spec" do |value, options|
      options[:force] = true
    end
    add_option "--strict", "consider warnings as errors when validating the spec" do |value, options|
      options[:strict] = true
    end
    add_option "-o", "--output FILE", "output gem with the given filename" do |value, options|
      options[:output] = value
    end
    add_option "-C PATH", "Run as if gem build was started in <PATH> instead of the current working directory." do |value, options|
      options[:build_path] = value
    end
  end
  def arguments # :nodoc:
    "GEMSPEC_FILE  gemspec file name to build a gem for"
  end
  def description # :nodoc:
    <<-EOF
The build command allows you to create a gem from a ruby gemspec.
The best way to build a gem is to use a Rakefile and the Gem::PackageTask
which ships with RubyGems.
The gemspec can either be created by hand or extracted from an existing gem
with gem spec:
  $ gem unpack my_gem-1.0.gem
  Unpacked gem: '.../my_gem-1.0'
  $ gem spec my_gem-1.0.gem --ruby > my_gem-1.0/my_gem-1.0.gemspec
  $ cd my_gem-1.0
  [edit gem contents]
  $ gem build my_gem-1.0.gemspec
Gems can be saved to a specified filename with the output option:
  $ gem build my_gem-1.0.gemspec --output=release.gem
    EOF
  end
  def usage # :nodoc:
    "#{program_name} GEMSPEC_FILE"
  end
  def execute
    if build_path = options[:build_path]
      Dir.chdir(build_path) { build_gem }
      return
    end
    build_gem
  end
  private
  def find_gemspec(glob = "*.gemspec")
    gemspecs = Dir.glob(glob).sort
    if gemspecs.size > 1
      alert_error "Multiple gemspecs found: #{gemspecs}, please specify one"
      terminate_interaction(1)
    end
    gemspecs.first
  end
  def build_gem
    gemspec = resolve_gem_name
    if gemspec
      build_package(gemspec)
    else
      alert_error error_message
      terminate_interaction(1)
    end
  end
  def build_package(gemspec)
    spec = Gem::Specification.load(gemspec)
    if spec
      Gem::Package.build(
        spec,
        options[:force],
        options[:strict],
        options[:output]
      )
    else
      alert_error "Error loading gemspec. Aborting."
      terminate_interaction 1
    end
  end
  def resolve_gem_name
    return find_gemspec unless gem_name
    if File.exist?(gem_name)
      gem_name
    else
      find_gemspec("#{gem_name}.gemspec") || find_gemspec(gem_name)
    end
  end
  def error_message
    if gem_name
      "Couldn't find a gemspec file matching '#{gem_name}' in #{Dir.pwd}"
    else
      "Couldn't find a gemspec file in #{Dir.pwd}"
    end
  end
  def gem_name
    get_one_optional_argument
  end
end