1 files changed, 51 insertions, 0 deletions
diff --git a/docs/_plugins/incremental_regeneration_fixer.rb b/docs/_plugins/incremental_regeneration_fixer.rb
new file mode 100644
index 000000000..f138c37bc
--- /dev/null
+++ b/docs/_plugins/incremental_regeneration_fixer.rb
@@ -0,0 +1,51 @@
+module IncrementalRegenerationFixer
+  def IncrementalRegenerationFixer.init(site)
+    if site.regenerator.disabled?
+      return
+    end
+
+    # This is a fix for the following bug:
+    #
+    #   https://github.com/jekyll/jekyll/issues/4112
+    #
+    # To work around it, we'll remember groups of interdependent files;
+    # if any of the files in a group changes, we'll make sure to
+    # regenerate *all* the files in that group.
+    interdependent_files = []
+
+    config = site.config['incremental_regeneration_fixer']
+    if not config
+      raise ("You probably want to specify incremental_regeneration_fixer " +
+             "config if you want to use this plugin")
+    end
+
+    globs = config['interdependent_files']
+    if not globs
+      return
+    end
+
+    for glob in globs
+      group = Dir["#{site.source}/#{glob}"]
+      if group.length == 0
+        raise ("The path '#{glob}' contains no files! Please fix " +
+               "interdependent_files in your site's _config.yml.")
+      end
+      interdependent_files << group
+    end
+
+    for group in interdependent_files
+      for srcfile in group
+        if site.regenerator.modified? srcfile
+          for dependent_file in group
+            site.regenerator.force dependent_file
+          end
+          break
+        end
+      end
+    end
+  end
+end
+
+Jekyll::Hooks.register :site, :post_read do |site|
+  IncrementalRegenerationFixer.init(site)
+end