Process metadata of Chef cookbooks

README.md

increment_metadata_version.rb

#!/usr/bin/env ruby

require 'chef/cookbook/metadata'
require 'chef/version_class'

# Add increment methods to Chef::Version
class Chef
  class Version
    def increment_patch
      @patch += 1
      self
    end

    def increment_minor
      @minor += 1
      self
    end

    def increment_major
      @major += 1
      self
    end
  end
end


metadata_file = ARGV.first || 'metadata.rb'

metadata = Chef::Cookbook::Metadata.new
metadata.from_file(metadata_file)

puts "#{metadata.name} #{metadata.version}"

new_version = Chef::Version.new(metadata.version).increment_patch

puts "#{metadata.name} #{new_version}"

parse_metadata.rb

#!/usr/bin/env ruby

require 'chef/cookbook/metadata'

metadata_file = ARGV.first || 'metadata.rb'

metadata = Chef::Cookbook::Metadata.new
metadata.from_file(metadata_file)

puts "#{metadata.name} #{metadata.version}"

metadata.dependencies.each do |cookbook, version|
  puts "#{cookbook} #{version}"
end

parse_metadata_myself.rb

#!/usr/bin/env ruby

class CookbookMetadata
  class << self
    def from_file(file)
      content = File.read(file)
      object = new(file)
      object.load(content)
    end
  end

  attr_reader :cb_name, :cb_version, :dependencies

  def initialize(file)
    @file = file
    @cb_name = nil
    @cb_version = nil
    @dependencies = Hash.new
  end

  def name(value)
    @cb_name = value
  end

  def version(value)
    @cb_version = value
  end

  def depends(cb_name, version=nil)
    @dependencies[cb_name] = version || ">= 0.0.0"
  end

  %w(maintainer maintainer_email license description
     long_description recipe supports).each do |method|
    define_method(method.to_sym) do |*args|
    end
  end

  def load(content)
    instance_eval(content)
    self
  end
end


metadata_file = ARGV.first || 'metadata.rb'

metadata = CookbookMetadata.from_file(metadata_file)

puts "#{metadata.cb_name} #{metadata.cb_version}"

metadata.dependencies.each do |cookbook, version|
  puts "#{cookbook} #{version}"
end

Inspired by https://github.com/RiotGames/berkshelf/blob/v0.4.0/lib/berkshelf/berksfile.rb#L140-169