Meh.

.gitignore

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+build

Gemfile

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+source "http://rubygems.org"
+
+gem "middleman", "3.0.0.rc.1"

Gemfile.lock

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+GEM
+  remote: http://rubygems.org/
+  specs:
+    activesupport (3.2.5)
+      i18n (~> 0.6)
+      multi_json (~> 1.0)
+    chunky_png (1.2.5)
+    coffee-script (2.2.0)
+      coffee-script-source
+      execjs
+    coffee-script-source (1.3.3)
+    compass (0.12.1)
+      chunky_png (~> 1.2)
+      fssm (>= 0.2.7)
+      sass (~> 3.1)
+    execjs (1.3.2)
+      multi_json (~> 1.0)
+    ffi (1.0.11)
+    fssm (0.2.9)
+    haml (3.1.6)
+    hike (1.2.1)
+    http_router (0.10.2)
+      rack (>= 1.0.0)
+      url_mount (~> 0.2.1)
+    i18n (0.6.0)
+    listen (0.4.4)
+      rb-fchange (~> 0.0.5)
+      rb-fsevent (~> 0.9.1)
+      rb-inotify (~> 0.8.8)
+    maruku (0.6.0)
+      syntax (>= 1.0.0)
+    middleman (3.0.0.rc.1)
+      middleman-core (= 3.0.0.rc.1)
+      middleman-more (= 3.0.0.rc.1)
+      middleman-sprockets (= 3.0.0.rc.1)
+    middleman-core (3.0.0.rc.1)
+      activesupport (~> 3.2.4)
+      bundler (~> 1.1)
+      listen (~> 0.4.2)
+      rack (~> 1.4.0)
+      rack-test (~> 0.6.1)
+      thor (~> 0.14.3)
+      tilt (~> 1.3.1)
+    middleman-more (3.0.0.rc.1)
+      coffee-script (~> 2.2.0)
+      coffee-script-source (~> 1.3.3)
+      compass (>= 0.12.1)
+      execjs (~> 1.3.2)
+      haml (>= 3.1.0)
+      i18n (~> 0.6.0)
+      maruku (~> 0.6.0)
+      middleman-core (= 3.0.0.rc.1)
+      padrino-helpers (~> 0.10.6)
+      sass (>= 3.1.7)
+      uglifier (~> 1.2.0)
+    middleman-sprockets (3.0.0.rc.1)
+      middleman-more (= 3.0.0.rc.1)
+      sprockets (~> 2.1)
+      sprockets-sass (~> 0.8.0)
+    multi_json (1.1.0)
+    padrino-core (0.10.6)
+      activesupport (~> 3.2.0)
+      http_router (~> 0.10.2)
+      sinatra (~> 1.3.1)
+      thor (~> 0.14.3)
+      tilt (~> 1.3.0)
+    padrino-helpers (0.10.6)
+      i18n (~> 0.6)
+      padrino-core (= 0.10.6)
+    rack (1.4.1)
+    rack-protection (1.2.0)
+      rack
+    rack-test (0.6.1)
+      rack (>= 1.0)
+    rb-fchange (0.0.5)
+      ffi
+    rb-fsevent (0.9.1)
+    rb-inotify (0.8.8)
+      ffi (>= 0.5.0)
+    sass (3.1.19)
+    sinatra (1.3.2)
+      rack (~> 1.3, >= 1.3.6)
+      rack-protection (~> 1.2)
+      tilt (~> 1.3, >= 1.3.3)
+    sprockets (2.1.2)
+      hike (~> 1.2)
+      rack (~> 1.0)
+      tilt (~> 1.1, != 1.3.0)
+    sprockets-sass (0.8.0)
+      sprockets (~> 2.0)
+      tilt (~> 1.1)
+    syntax (1.0.0)
+    thor (0.14.6)
+    tilt (1.3.3)
+    uglifier (1.2.4)
+      execjs (>= 0.3.0)
+      multi_json (>= 1.0.2)
+    url_mount (0.2.1)
+      rack
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  middleman (= 3.0.0.rc.1)

config.rb

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+activate :automatic_image_sizes
+activate :relative_assets
+
+helpers do
+  def here
+    Page.glob(request.path + '.*').first
+  end
+  def roots
+    Page.roots
+  end
+
+  # Relativize
+  def rel(url)
+    # Assume abs path
+    url = url[1..-1]
+    url = url.squeeze('/')
+
+    # Append ../'s
+    depth = request.path.count('/') - 1
+    path = '../' * depth + url
+
+    path.squeeze('/')
+  end
+end
+
+# Page model.
+#
+#     # Lookup by filename
+#     Page['index.html.haml']           #=> Page instance or nil
+#     Page.glob 'index.html.*'          #=> Array of Pages
+#
+#
+# Metadata:
+#
+#     page.title             #=> "Getting started"
+#     page.basename          #=> "getting_started"
+#     page.path              #=> "/getting_started/index.html"
+#     page.data              #=> Hash
+#     page.template_type     #=> "haml"
+#     page.raw               #=> String (raw template data)
+#     page.content           #=> String
+#
+# Tree traversal:
+#
+#     page.parent?           #=> True/false
+#     page.parent            #=> Page, or nil if it's a root
+#     page.root?             #=> True if depth = 0
+#     page.depth             #=> Number, minimum of 0
+#     page.breadcrumbs       #=> Array of ancestors
+#     page.children          #=> Array
+#     page.siblings          #=> Array
+#
+class Page
+  attr_reader :path
+  attr_reader :basename
+  attr_reader :raw
+  attr_reader :title
+  attr_reader :data
+  attr_reader :template_type
+
+  def self.source_path
+    'source'
+  end
+
+  def self.glob(spec, except=nil)
+    fullspec = File.join(source_path, spec)
+    list = Dir[fullspec].map do |f|
+      Page[ f[(source_path.length + 1)..-1] ]
+    end.sort
+    list.delete except  if except
+    list
+  end
+
+  def self.[](name)
+    @pages ||= Hash.new
+    @pages[name] ||= Page.new name
+  end
+
+  def self.roots
+    glob('*.html.*') + glob('*/index.html.*')
+  end
+
+  def sort_index
+    [ (data['order'] || 99999), @basename ]
+  end
+
+  def <=>(other)
+    sort_index <=> other.sort_index
+  end
+
+  def self.mm_server
+    ::Middleman::Application.server.inst
+  end
+
+  def self.fm_manager
+    mm_server.frontmatter_manager
+  end
+
+  def initialize(path)
+    path = path.gsub(/^(\.?\/)+/, '')
+    @basepath = (path =~ /^(.*)\.html\.([A-Za-z0-9]*)$/) && $1 || path
+    @template_type = $2
+    @basename = File.basename(@basepath)
+    @dir = File.dirname(path)
+    @parent_dir = File.dirname(@dir)
+    @parent_dir = ''  if @parent_dir == '.'
+    @full_path = File.join(self.class.source_path, path)
+    @path = "/#{@basepath}.html"
+    @data, @raw = self.class.fm_manager.data(path)
+    @title = data['title'] || @basename
+  end
+
+  def content
+    # TODO: Parse
+    @content ||= @raw
+  end
+
+  def to_s
+    title
+  end
+
+  def parent
+    if @basename == 'index'
+      Page.glob(File.join(@parent_dir, 'index.html.*'), self).first
+    else
+      Page.glob(File.join(@dir, 'index.html.*'), self).first ||
+      Page.glob(File.join(@parent_dir, "#{basename}.html.*"), self).first
+    end
+  end
+
+  def parent?
+    !! parent
+  end
+
+  def root?
+    ! parent?
+  end
+
+  def depth
+    root ? 0 : parent.depth + 1
+  end
+
+  def breadcrumbs
+    if parent?
+      [ *parent.breadcrumbs, self ]
+    else
+      [ self ]
+    end
+  end
+
+  def children
+    @children ||= if @basename == 'index' && !root?
+      (Page.glob(File.join(@dir, '*.html.*'), self) +
+      Page.glob(File.join(@dir, '*', 'index.html.*'), self)).sort
+    else
+      (Page.glob(File.join(@dir, @basepath, '*.html.*'), self) +
+      Page.glob(File.join(@dir, @basepath, '*', 'index.html.*'), self)).sort
+    end
+  end
+
+  def all_siblings
+    @all_siblings ||= begin
+      list = if @basename == 'index' && !root?
+        (Page.glob(File.join(@parent_dir, '*.html.*')) +
+        Page.glob(File.join(@parent_dir, '*', 'index.html.*'))).sort
+      else
+        (Page.glob(File.join(@dir, '*.html.*')) +
+        Page.glob(File.join(@dir, '*', 'index.html.*'))).sort
+      end
+      list = list.reject { |p| p.basename == 'index' }
+      list
+    end
+  end
+
+  def siblings
+    @siblings ||= begin
+      list = all_siblings.dup
+      list.delete self
+      list
+    end
+  end
+end
+
+set :layout, :'_templates/layout'

source/_templates/layout.haml

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+!!! 5
+%html
+  %head
+    %meta{charset: 'utf-8'}
+    %meta{content: 'IE=edge,chrome=1', 'http-equiv' => 'X-UA-Compatible'}
+    %title= data.page.title
+    = stylesheet_link_tag 'site.css'
+    = yield_content :head
+  %body{class: page_classes}
+  #sidebar
+    %h3 Parent:
+    - if here && here.parent?
+      %a{href: rel(here.parent.path)}= here.parent
+    %h3 Roots:
+    %ul
+      - roots.each do |page|
+        %li
+          %a{href: rel(page.path)}= page
+    - if here
+      %h3 Children:
+      %ul
+        - here.children.each do |page|
+          %li
+            %a{href: rel(page.path)}= page
+      %h3 Siblings:
+      %ul
+        - here.all_siblings.each do |page|
+          %li
+            %a{href: rel(page.path)}= page
+  #main
+    = yield

source/getting_started.html.haml

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+%h1 Getting started
+
+%p Hello there

source/hello.html.haml

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+%h1 Hello
+
+%p Hello there

source/hello.md

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+---
+title: Hello
+---
+
+Hello there
+
+* Yes
+* Yo

source/index.html.haml

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+---
+title: Lol
+---
+- content_for :head do
+  %title The Middleman!
+
+%p The Middleman is watching.

source/stylesheets/site.css.scss

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+@import "compass";
+
+$link-color:         #0388a6;
+$link-hover-color:   #009ce0;
+$link-focus-color:   false;
+$link-active-color:  false;
+$link-visited-color: false;
+
+$font-color:  #2a2a2a;
+$font-family: sans-serif;
+$base-font-size:   12px;
+$base-line-height: 18px;
+
+$total-cols: 12;
+$col-width: 4em;
+$gutter-width: 1em;
+$side-gutter-width: $gutter-width;
+
+@include global-reset;
+
+body {
+  font-family: $font-family;
+  color: $font-color; 
+}
+
+a {
+  @include link-colors($link-color, $link-hover-color, $link-focus-color, $link-active-color, $link-visited-color);
+}
+
+#main {
+  padding: 50px;
+}