From a1a4b3937accbe593241c1d37c4f034b8c8b4104 Mon Sep 17 00:00:00 2001
From: Parker Moore <parkrmoore@gmail.com>
Date: Fri, 25 Mar 2016 16:29:37 -0700
Subject: [PATCH] Add Layout#relative_path so the layout can tell us what its
 path is for error messages

---
 lib/jekyll/convertible.rb | 6 +++---
 lib/jekyll/layout.rb      | 8 ++++++++
 lib/jekyll/renderer.rb    | 2 +-
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/lib/jekyll/convertible.rb b/lib/jekyll/convertible.rb
index f58796f0..d563961a 100644
--- a/lib/jekyll/convertible.rb
+++ b/lib/jekyll/convertible.rb
@@ -215,9 +215,9 @@ module Jekyll
         payload["layout"]  = Utils.deep_merge_hashes(payload["layout"] || {}, layout.data)
 
         self.output = render_liquid(layout.content,
-                                         payload,
-                                         info,
-                                         File.join(site.config['layouts_dir'], layout.name))
+                                    payload,
+                                    info,
+                                    layout.relative_path)
 
         # Add layout to dependency tree
         site.regenerator.add_dependency(
diff --git a/lib/jekyll/layout.rb b/lib/jekyll/layout.rb
index c29f353f..aed6afe1 100644
--- a/lib/jekyll/layout.rb
+++ b/lib/jekyll/layout.rb
@@ -45,5 +45,13 @@ module Jekyll
     def process(name)
       self.ext = File.extname(name)
     end
+
+    # The path to the layout, relative to the site source.
+    #
+    # Returns a String path which represents the relative path
+    #   from the site source to this layout
+    def relative_path
+      @relative_path ||= Pathname.new(path).relative_path_from(Pathname.new(site.source)).to_s
+    end
   end
 end
diff --git a/lib/jekyll/renderer.rb b/lib/jekyll/renderer.rb
index 7d20d452..820d300e 100644
--- a/lib/jekyll/renderer.rb
+++ b/lib/jekyll/renderer.rb
@@ -146,7 +146,7 @@ module Jekyll
           layout.content,
           payload,
           info,
-          File.join(site.config['layouts_dir'], layout.name)
+          layout.relative_path
         )
 
         # Add layout to dependency tree