Multiple Authors w/ Nesta CMS

app.rb

require 'rubygems'
require 'sinatra'

module Nesta
  
  class App
    helpers do
      def set_common_variables
        @menu_items = Nesta::Menu.for_path('/')
        @site_title = Nesta::Config.title
        @default_author = Nesta::Config.author
        @authors = Nesta::Config.authors
        set_from_config(:title, :subtitle, :google_analytics_code)
        @heading = @title
      end
      
      def author_uri(author)
        get_author_data_by_key(author,"uri")
      end
      
      def author_email(author)
        get_author_data_by_key(author,"email")
      end
      
      def get_author_data_by_key(author,key)
        item = String.new
        @authors.each do |a|
          if a[ "name" ].to_s.downcase == author.downcase
            item = a[ key ]
          end
        end
        if item.empty?
          item = @default_author[ key ]
        end
        item
      end
  end
  
  class Config
    def self.authors
      authors = from_yaml("authors")
    end    
  end
  
  class FileModel
    def author
      if metadata("author")
        metadata("author")
      else
        Nesta::Config.author["name"]
      end
    end
  end
end

config.yml

# Title and subheading for your site. Used on the home page and in page
# titles.
#
title: "Example Site"
subtitle: "My Cool Example with Multiple Authors"

# You should really specify your content's author when generating an
# Atom feed. Specify at least one of name, uri or email, and Nesta will
# include it in your feed. See the Atom spec for more info:
#
# http://www.atomenabled.org/developers/syndication/atom-format-spec.php#element.feed
#

# Default Author
author:
   name: Default Author
   uri: http://mycoolsite.com
   email: author@mycoolsite.com

# Author listing
authors:
-   name: "John Doe"
    uri: "http://mycoolsite.com/authors/john-doe/"
    email: "john@mycoolsite.com"
-   name: "Jane Doe"
    uri: "http://mycoolsite.com/authors/jane-doe/"
    email: "jane@mycoolsite.com"
    
# You can stick with the default look and feel, or use a theme. Themes are
# easy to create or install, and live inside the themes directory. You
# can also use scripts/theme to install them.
#
theme: default

# If you want to use the Disqus service (http://disqus.com) to display
# comments on your site, register a Disqus account and then specify your
# site's short name here. A comment form will automatically be added to
# the bottom of your pages.
#
# disqus_short_name: default

# cache
#     Set it to true if you'd like Nesta to cache your pages in ./public.
#     Useful if you're deploying Nesta with a proxy server such as Nginx,
#     but not in the least bit helpful if your pages are dynamic, or you're
#     deploying Nesta to Heroku.
#
cache: false

# content
#     The root directory where nesta will look for your article files.
#     Should contain "pages" and "attachments" subdirectories that contain
#     your actual content and the (optional) menu.txt file that links to your
#     main category pages.
#
content: content-demo

# google_analytics_code
#     Set this if you want Google Analytics to track traffic on your site.
#     Probably best not to set a default value, but to set it in production.
#
#     The production settings are used if you're deploying to Heroku, so
#     scroll down a bit to set it in production even if you're not deploying
#     to your own server.
#
# google_analytics_code: "UA-???????-?"

# Overriding "cache" and "content" in production is recommended if you're
# deploying Nesta to your own server (but see the deployment documentation
# on the Nesta site). Setting google_analytics_code in production is
# recommended regardless of how you're deploying (if you have a GA account!).
#
# Don't forget to uncomment the "production:" line too...

# production:
#   cache: true    
#   content: /var/apps/nesta/shared/content
#   google_analytics_code: "UA-???????-?"

post.haml

- unless pages.empty?
  - pages.each do |page|
      %h1
        %a(href="#{page.abspath}")= page.heading
      %h2 
        Posted
        - if page.date
          on 
          = format_date(page.date)
        - if page.author
          by
          - if author_uri(page.author)
            %a(href="#{author_uri(page.author)}")= page.author
          - else
            ~ page.author