add YARD settings

.gitignore

@@ -20,3 +20,4 @@ doc/
 log.txt
 videowriter_result.avi
 examples/contours/rotated-boxes-with-detected-bounding-rectangles.jpg
+.yardoc

Rakefile

@@ -4,6 +4,9 @@ require './ext/opencv/lib/opencv/psyched_yaml'
 require 'hoe'
 require 'rake/extensiontask'
 require './ext/opencv/lib/opencv/version'
+require 'yard'
+require 'yard/rake/yardoc_task'
+require File.dirname(__FILE__) + '/yard_extension'
 
 Hoe.plugin :gemspec
 
@@ -47,4 +50,8 @@ hoespec.spec.signing_key = nil
 
 Rake::Task[:test].prerequisites << :compile
 
+YARD::Rake::YardocTask.new do |t|
+  t.files = ['ext/opencv/*.cpp', 'ext/opencv/lib/*.rb']
+end
+
 # vim: syntax=Ruby

yard_extension.rb

@@ -0,0 +1,5 @@
+require 'yard'
+
+YARD::Tags::Library.define_tag('Corresponding OpenCV function', :opencv_func)
+YARD::Tags::Library.visible_tags.place(:opencv_func).before(:abstract)
+