Debug writing files during the build process (#6696)

Merge pull request 6696

lib/jekyll/convertible.rb

@@ -227,6 +227,7 @@ module Jekyll
     def write(dest)
       path = destination(dest)
       FileUtils.mkdir_p(File.dirname(path))
+      Jekyll.logger.debug "Writing:", path
       File.write(path, output, :mode => "wb")
       Jekyll::Hooks.trigger hook_owner, :post_write, self
     end

lib/jekyll/document.rb

@@ -239,6 +239,7 @@ module Jekyll
     def write(dest)
       path = destination(dest)
       FileUtils.mkdir_p(File.dirname(path))
+      Jekyll.logger.debug "Writing:", path
       File.write(path, output, :mode => "wb")
 
       trigger_hooks(:post_write)

lib/jekyll/regenerator.rb

@@ -120,6 +120,7 @@ module Jekyll
     # Returns nothing.
     def write_metadata
       unless disabled?
+        Jekyll.logger.debug "Writing Metadata:", ".jekyll-metadata"
         File.binwrite(metadata_file, Marshal.dump(metadata))
       end
     end