Gemfile.local outside of version control

Gemfile.local

custom_gemfile = <<~GEMFILE
  gem "solargraph", require: false
  gem 'solargraph-rails', require: false
  # gem 'rails', path: '~/.ghq/github.com/rails/rails'
  # gem 'activerecord', path: '~/.ghq/github.com/rails/rails/activerecord'
  gem 'actionpack', path: '~/.ghq/github.com/rails/rails/actionpack'
  gem 'activesupport', path: '~/.ghq/github.com/rails/rails/activesupport'
  gem 'debug'
GEMFILE

ignore_gem = [
               # 'awesome_print'
]

custom_lines = {} # { gem_name => gem_line }
custom_gemfile.each_line do |line|
  pattern = /^\s*gem ['"](?<name>.+?)['"]/
  matched = line.match(pattern)
  custom_lines[matched[:name]] = line if matched
end

new_content = ''
replaced_gems = []
File.open('Gemfile').each_line do |original_line|
  next if ignore_gem.any? { |original_gem| original_line =~ /^\s*gem ['"](?<name>#{original_gem})['"]/ }

  replace_gem, replace_line  = custom_lines.find { |name, _| original_line =~ /^\s*gem ['"](?<name>#{name})['"]/ }
  if replace_gem
    # Replace gem line with custom gem line
    new_content << new_line
    replaced_gems << replace_gem
  else
    # Keep original gem line
    new_content << original_line
  end
end

# Add custom gem that are not in Gemfile
(custom_lines.keys - replaced_gems).each do |name|
  new_content << custom_lines[name]
end

FileUtils.cp 'Gemfile.lock', 'Gemfile.local.lock' if File.exist?('Gemfile.lock')

instance_eval new_content

.envrc

export BUNDLE_GEMFILE=Gemfile.local