From af673529cb8381e0fc35369599bb2a9343094564 Mon Sep 17 00:00:00 2001
From: Tom Preston-Werner <tom@mojombo.com>
Date: Wed, 5 Nov 2008 22:00:30 -0500
Subject: [PATCH] allow nested layouts

---
 lib/autoblog.rb             |  1 +
 lib/autoblog/convertible.rb | 25 +++++++++++++++++++
 lib/autoblog/layout.rb      | 48 +++++++++++++++++++++++++++++++++++++
 lib/autoblog/page.rb        | 13 ++++------
 lib/autoblog/post.rb        | 11 +++------
 lib/autoblog/site.rb        |  2 +-
 6 files changed, 82 insertions(+), 18 deletions(-)
 create mode 100644 lib/autoblog/layout.rb

diff --git a/lib/autoblog.rb b/lib/autoblog.rb
index 1c36a2ae..ce2d7367 100644
--- a/lib/autoblog.rb
+++ b/lib/autoblog.rb
@@ -16,6 +16,7 @@ require 'redcloth'
 # internal requires
 require 'autoblog/site'
 require 'autoblog/convertible'
+require 'autoblog/layout'
 require 'autoblog/page'
 require 'autoblog/post'
 require 'autoblog/filters'
diff --git a/lib/autoblog/convertible.rb b/lib/autoblog/convertible.rb
index a7c1548e..dfe444fb 100644
--- a/lib/autoblog/convertible.rb
+++ b/lib/autoblog/convertible.rb
@@ -24,5 +24,30 @@ module AutoBlog
         self.content = RedCloth.new(self.content).to_html
       end
     end
+    
+    # Add any necessary layouts to this post
+    #   +layouts+ is a Hash of {"name" => "layout"}
+    #   +site_payload+ is the site payload hash
+    #
+    # Returns nothing
+    def do_layout(payload, layouts, site_payload)
+      # construct payload
+      payload = payload.merge(site_payload)
+      
+      # render content
+      self.content = Liquid::Template.parse(self.content).render(payload, [AutoBlog::Filters])
+      
+      # output keeps track of what will finally be written
+      self.output = self.content
+      
+      # recursively render layouts
+      layout = layouts[self.data["layout"]]
+      while layout
+        payload = payload.merge({"content" => self.output, "page" => self.data})
+        self.output = Liquid::Template.parse(layout.content).render(payload, [AutoBlog::Filters])
+        
+        layout = layouts[layout.data["layout"]]
+      end
+    end
   end
 end
\ No newline at end of file
diff --git a/lib/autoblog/layout.rb b/lib/autoblog/layout.rb
new file mode 100644
index 00000000..ef4eec5f
--- /dev/null
+++ b/lib/autoblog/layout.rb
@@ -0,0 +1,48 @@
+module AutoBlog
+
+  class Layout
+    include Convertible
+    
+    attr_accessor :ext
+    attr_accessor :data, :content
+    
+    # Initialize a new Layout.
+    #   +base+ is the String path to the <source>
+    #   +name+ is the String filename of the post file
+    #
+    # Returns <Page>
+    def initialize(base, name)
+      @base = base
+      @name = name
+      
+      self.data = {}
+      
+      self.process(name)
+      self.read_yaml(base, name)
+    end
+    
+    # Extract information from the layout filename
+    #   +name+ is the String filename of the layout file
+    #
+    # Returns nothing
+    def process(name)
+      self.ext = File.extname(name)
+    end
+    
+    # Add any necessary layouts to this post
+    #   +layouts+ is a Hash of {"name" => "layout"}
+    #   +site_payload+ is the site payload hash
+    #
+    # Returns nothing
+    def add_layout(layouts, site_payload)
+      payload = {"page" => self.data}.merge(site_payload)
+      self.content = Liquid::Template.parse(self.content).render(payload, [AutoBlog::Filters])
+      
+      layout = layouts[self.data["layout"]] || self.content
+      payload = {"content" => self.content, "page" => self.data}
+      
+      self.content = Liquid::Template.parse(layout).render(payload, [AutoBlog::Filters])
+    end
+  end
+
+end
\ No newline at end of file
diff --git a/lib/autoblog/page.rb b/lib/autoblog/page.rb
index 229d5cd2..5865b6c1 100644
--- a/lib/autoblog/page.rb
+++ b/lib/autoblog/page.rb
@@ -4,7 +4,7 @@ module AutoBlog
     include Convertible
     
     attr_accessor :ext
-    attr_accessor :data, :content
+    attr_accessor :data, :content, :output
     
     # Initialize a new Page.
     #   +base+ is the String path to the <source>
@@ -38,13 +38,8 @@ module AutoBlog
     #
     # Returns nothing
     def add_layout(layouts, site_payload)
-      payload = {"page" => self.data}.merge(site_payload)
-      self.content = Liquid::Template.parse(self.content).render(payload, [AutoBlog::Filters])
-      
-      layout = layouts[self.data["layout"]] || self.content
-      payload = {"content" => self.content, "page" => self.data}
-      
-      self.content = Liquid::Template.parse(layout).render(payload, [AutoBlog::Filters])
+      payload = {"page" => self.data}
+      do_layout(payload, layouts, site_payload)
     end
     
     # Write the generated page file to the destination directory.
@@ -61,7 +56,7 @@ module AutoBlog
       
       path = File.join(dest, @dir, name)
       File.open(path, 'w') do |f|
-        f.write(self.content)
+        f.write(self.output)
       end
     end
   end
diff --git a/lib/autoblog/post.rb b/lib/autoblog/post.rb
index 92d1b8ba..36c0b3c2 100644
--- a/lib/autoblog/post.rb
+++ b/lib/autoblog/post.rb
@@ -86,15 +86,10 @@ module AutoBlog
     #
     # Returns nothing
     def add_layout(layouts, site_payload)
+      # construct post payload
       related = related_posts(site_payload["site"]["posts"])
-      
-      payload = {"page" => self.data, "related_posts" => related}.merge(site_payload)
-      self.content = Liquid::Template.parse(self.content).render(payload, [AutoBlog::Filters])
-      
-      layout = layouts[self.data["layout"]] || self.content
-      payload = {"content" => self.content, "page" => self.data}
-      
-      self.output = Liquid::Template.parse(layout).render(payload, [AutoBlog::Filters])
+      payload = {"page" => self.data, "related_posts" => related}
+      do_layout(payload, layouts, site_payload)
     end
     
     # Write the generated post file to the destination directory.
diff --git a/lib/autoblog/site.rb b/lib/autoblog/site.rb
index b85d37a9..6df05b45 100644
--- a/lib/autoblog/site.rb
+++ b/lib/autoblog/site.rb
@@ -40,7 +40,7 @@ module AutoBlog
       
       entries.each do |f|
         name = f.split(".")[0..-2].join(".")
-        self.layouts[name] = File.read(File.join(base, f))
+        self.layouts[name] = Layout.new(base, f)
       end
     rescue Errno::ENOENT => e
       # ignore missing layout dir