outdatedなgemリストをmajor, minor, tiny以下でグルーピングして出力するスクリプト

grouped_outdated.rb

# frozen_string_literal: true
# outdatedなgemリストをmajor, minor, tiny以下でグルーピングして出力するスクリプト
# usage: bundle outdated | ruby grouped_outdated.rb
#
# NOTE: なぐり書き

def collect_geminfo_from_bundle_outdated_text(str)
  str.lines.map do |line|
    matched = line =~ /\s*\* ([\w\-]+) \((.+)\).*/
    next unless matched
    name = Regexp.last_match(1)
    versions = Regexp.last_match(2)
      .split(',')
      .select { |str| str =~ /newest|installed/ }
      .inject({}) do |res, str|
      key = case str
            when /newest/
              :newest
            when /installed/
              :installed
            end
      m = str.match(Gem::Version::VERSION_PATTERN)
      res[key] = m[0].split('.').map(&:to_i)
      res
    end
    {
      name: name,
      versions: versions
    }
  end.compact
end

def grouping_version(collected_geminfo)
  collected_geminfo.group_by do |geminfo|
    if geminfo[:versions][:newest][0] > geminfo[:versions][:installed][0]
      :major
    elsif geminfo[:versions][:newest][1] > geminfo[:versions][:installed][1]
      :minor
    else
      :tiny
    end
  end
end

str = STDIN.read
a = collect_geminfo_from_bundle_outdated_text(str)
grouped = grouping_version(a)
grouped.each do |key, geminfos|
  puts "## #{key}"
  geminfos.each do |geminfo|
    puts "- [ ] #{geminfo[:name]} : #{geminfo[:versions][:newest].join('.')} <- #{geminfo[:versions][:installed].join('.')}"
  end
  puts
end