module Bundler::CLI::Common

def self.ask_for_spec_from(specs)
  if !$stdout.tty? && ENV['BUNDLE_SPEC_RUN'].nil?
    raise GemNotFound, gem_not_found_message(name, Bundler.definition.dependencies)
  end
  specs.each_with_index do |spec, index|
    Bundler.ui.info "#{index.succ} : #{spec.name}", true
  end
  Bundler.ui.info '0 : - exit -', true
  num = Bundler.ui.ask('> ').to_i
  num > 0 ? specs[num - 1] : nil
end

def self.gem_not_found_message(missing_gem_name, alternatives)
  require 'bundler/similarity_detector'
  message = "Could not find gem '#{missing_gem_name}'."
  alternate_names = alternatives.map { |a| a.respond_to?(:name) ? a.name : a }
  suggestions = SimilarityDetector.new(alternate_names).similar_word_list(missing_gem_name)
  message += "\nDid you mean #{suggestions}?" if suggestions
  message
end

def self.select_spec(name, regex_match = nil)
  specs = []
  regexp = Regexp.new(name) if regex_match
  Bundler.definition.specs.each do |spec|
    return spec if spec.name == name
    specs << spec if regexp && spec.name =~ regexp
  end
  case specs.count
  when 0
    raise GemNotFound, gem_not_found_message(name, Bundler.definition.dependencies)
  when 1
    specs.first
  else
    ask_for_spec_from(specs)
  end
rescue RegexpError
  raise GemNotFound, gem_not_found_message(name, Bundler.definition.dependencies)
end

def self.without_groups_message
  groups = Bundler.settings.without
  group_list = [groups[0...-1].join(", "), groups[-1..-1]].
    reject{|s| s.to_s.empty? }.join(" and ")
  group_str = (groups.size == 1) ? "group" : "groups"
  "Gems in the #{group_str} #{group_list} were not installed."
end