Index: lib/tasks/wikydump.rake
===================================================================
--- lib/tasks/wikydump.rake	(nonexistent)
+++ lib/tasks/wikydump.rake	(working copy)
@@ -0,0 +1,65 @@
+namespace :redmine do
+  namespace :wikidump do
+
+    def export_wiki(project, template, path)
+      pages = project.wiki.pages.
+        order('title').
+        includes([:content, { attachments: :author }]).
+        to_a
+      assigns = {
+        wiki: project.wiki,
+        project: project,
+        pages: pages,
+        action_name: 'export_multiple'
+      }
+      lookup_context = ActionView::LookupContext.new(ActionController::Base.view_paths)
+      view = ActionView::Base.with_empty_template_cache.new(lookup_context, assigns, ActionController::Base.new)
+      view.class_eval do
+        include Rails.application.routes.url_helpers
+        include ApplicationHelper
+        include WikiHelper
+        include Redmine::I18n
+        def url_options
+          { host: Setting.host_name.split('/')[0] }
+        end
+      end
+      File.open(path, 'w') do |f|
+        f.write view.render(template: template)
+      end
+    end
+
+    desc <<-END_DESC
+    Dump the wiki of a project to a PDF file.
+    Available options:
+      * project   => id or identifier of project (defaults to first projects)
+      * directory => output directory (defaults to rails temporary directory)
+    Example:
+      rake redmine:wikidump:pdf project=my-project-identifier directory=/tmp RAILS_ENV="production"
+    END_DESC
+
+    task pdf: :environment do
+      project = ENV['project'] ? Project.find(ENV['project']) : Project.first
+      directory = ENV['directory'] || File.join(Rails.root, 'tmp')
+      path = File.join(directory, "#{project.identifier}.pdf")
+      export_wiki(project, 'wiki/export.pdf', path)
+    end
+
+    desc <<-END_DESC
+    Dump the wiki of a project to a HTML file.
+    Available options:
+      * project   => id or identifier of project (defaults to first projects)
+      * directory => output directory (defaults to rails temporary directory)
+    Example:
+      rake redmine:wikidump:html project=my-project-identifier directory=/tmp RAILS_ENV="production"
+    END_DESC
+
+    task html: :environment do
+      project = ENV['project'] ? Project.find(ENV['project']) : Project.first
+      directory = ENV['directory'] || File.join(Rails.root, 'tmp')
+      path = File.join(directory, "#{project.identifier}.html")
+      export_wiki project, 'wiki/export_multiple.html', path
+    end
+
+  end
+
+end
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