From: "Florian Aßmann" <fassmann@...>
Date: 2009-08-21T17:48:58+09:00
Subject: Mapping git repos to ruby objects und vice versa, need ideas

--Apple-Mail-23--193090641
Content-Type: text/plain;
	charset=ISO-8859-1;
	format=flowed;
	delsp=yes
Content-Transfer-Encoding: quoted-printable

Hi folks,

my last mail got a ambiguous subject so I try again with another one, =20=

since this
isn't a job offer... :)


I'm working on a lib called Chambermaid that creates snapshots of ruby
objects and stores them in a git repository.

The main objective of Chambermaid is not to mess with your classes or
objects. Instead Chambermaid should provide a simple but powerful API.

You work with browsers which will give you access to specific diaries
(repos) and diaries which will give you access to specific pages =20
(commits).
These pages contain snapshots of your ruby object.

Still neither documentation nor write support is available. I'm =20
currently
struggling on how to snapshot files.


So here is my question:
__Can you give me a hint how I should treat files and other more =20
complex types?__


Resources: http://github.com/boof/chambermaid


### ./example.rb
    require 'chambermaid'
    require 'person'

    PeopleBrowser =3D Chambermaid.browser Person # =3D> a Browser
    foo_master_page =3D PeopleBrowser[1].last_page # =3D> a Page
    person_foo =3D foo_master_page.target # =3D> a Person

    # method missing binds a Context to the method called returning =20
the value
    # returned by method
    person_foo.id =3D=3D foo_master_page.id


### ./person.rb:
    class Person
      attr_accessor :id, :firstname, :lastname, :email

      # tell Chambermaid where to find the repositories
      Chambermaid.keed_diary self,
          :in =3D> File.join(File.dirname(__FILE__), 'people'),
          :as =3D> :id
    end


### ./people/init.rb
    Chambermaid.ascribe Person do |has|
      # tell chambermaid where attributes should be read from and =20
write to

      # tell Chambermaid that the id is located in 'id.*' which reads
      # the value like:
      #
      # 1. a Context tries to find the correct filename =3D> id.int.1
      # 2. the filename is divided based on '.' =3D> id, int, '1'
      # 3. the last n-1 parts are filters that manipulate the value =3D> =
=20
int, '1'
      # 4. filters are applied in reverse order =3D> '1', int
      # 5. unrecognized filters, like '1', return itself as value =3D> =
'1'
      # 6. the int filter calls to_i on '1' =3D> 1
      # 7. the result is assigned to the attribute id
      has.attribute :id, 'int.%i', :id

      # tell Chambermaid the meta.yml file contains the =20
attributes :firstname and
      # :lastname where .map adds the yml filter chain if not defined.
      has.map :meta do |meta|
        meta.reads(:firstname) { |meta| meta['firstname'] }
        meta.reads(:lastname) { |meta| meta['lastname'] }
      end

      has.attribute :email, 'uri'

    end


### ./people/1/id.int.1
    1


### ./people/1/meta.yml
    ---
    firstname: Foo
    lastname: Bar
    ...


### ./people/1/email.uri
    mailto:foo@bar.url

Florian A=DFmann

Fork Unstable Media | Hamburg
www.fork.de <http://www.fork.de/>


--Apple-Mail-23--193090641--