succzero

--- diagram.rb.orig	2015-06-26 22:31:23.000000000 +0900
+++ diagram.rb	2015-06-26 22:31:52.000000000 +0900
@@ -114,7 +114,9 @@ module Asciidoctor
         target = attributes.delete('target')

         image_name = "#{target || ('diag-' + source.checksum)}.#{format}"
-        image_dir = File.expand_path(parent.document.attributes['imagesdir'] || '', parent.document.attributes['outdir'] || parent.document.attributes['docdir'])
+        outdir     = parent.document.attributes['outdir'] || parent.document.attributes['docdir']
+        imagesdir  = lambda {|s| outdir && s.chr == '/' ? s[1,s.length] : s}[(parent.document.attributes['imagesdir'] || '')]
+        image_dir  = File.expand_path(imagesdir, outdir)

succzero

# If you do not have OpenSSL installed, update
# the following line to use "http://" instead
source 'https://rubygems.org'

gem "middleman", "~>3.3.12"

# Live-reloading plugin
gem "middleman-livereload", "~> 3.1.0"

# For faster file watcher updates on Windows: