Programmatically uninstall one or more target gems including ALL of their dependencies.

trash_target_gems.rb

#!/usr/bin/env ruby

# -- coding: utf-8 --
# frozen_string_literal: true

require 'json'
require 'ostruct'
require 'logger'

# This module attempts to trash (uninstall) one or more target gems,
# including ALL of their dependent gems.
module TrashTargetGems
  def init_logger
    @logger ||= Logger.new(STDOUT)
    @logger.level = Logger::INFO
  end

  # Returns true if successful.
  #
  # Process a list of gems to be uninstalled.
  def cleanup_gem_mess
    json_string = '[
    { "name": "http-cookie", "version": "1.0.3" },
    { "name": "netrc", "version": "0.11.0" },
    { "name": "rest-client", "version": "1.8.0" },
    { "name": "domain_name", "version": "0.5.20190701" },
    { "name": "mime-types", "version": "2.99.3" },
    { "name": "unf", "version": "0.1.4" },
    { "name": "unf_ext", "version": "0.0.7.6" },
    { "name": "zip-zip", "version": "0.3" },
    { "name": "behave", "version": "0.4.0" }]'
    
    deps = JSON.parse(json_string, object_class: OpenStruct)
    cleansed = Array.new(deps.count) { |i| 0 }

    index = 0
    deps.each do |gem_obj|
      @logger.info("Trash this gem? #{gem_obj.name}, #{gem_obj.version}")
      # store 1=true; 0=false based on action
      cleansed[index] = cleanup_this_gem(gem_obj.name, gem_obj.version)
      index += 1
    end
    result = (cleansed.inject(0) { |sum, x| sum + x } > 0)
  end

  # Given this gem's attributes, execute shell commands
  # to uninstall unattended. ignore dependencies.
  def cleanup_this_gem(gem_name, gem_version)
    puts `gem list -i #{gem_name} -v #{gem_version}`
    if $?.success?
      puts `yes|gem uninstall #{gem_name} -v #{gem_version} -x -I`
      cleaned = $?.success? ? 1 : 0
    else
      cleaned = 0
    end
  end
end

# This class is an interface.
class UnwantedGems
  include TrashTargetGems
end

# execute the cleanup process
janitor = UnwantedGems.new
janitor.init_logger

if janitor.cleanup_gem_mess
  puts 'Gem(s) Uninstalled. Cleanup complete.'
else
  puts 'Gem(s) Not Found: maybe an issue.'
end