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EDIT :: build_command.rb

# 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

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EDIT :: build_command.rb