Use YARD for documentation

Author: mrkn

.yardopts

@@ -0,0 +1,6 @@
+--output-dir doc/reference
+--markup markdown
+--no-private
+lib/**/*.rb
+-
+doc/text/*

Rakefile

@@ -1,13 +1,16 @@
 require "bundler/gem_helper"
+require "yard"
 
 base_dir = File.expand_path("..", __FILE__)
 helper = Bundler::GemHelper.new(base_dir)
 helper.install
-spec = helper.gemspec
 
 desc "Run test"
 task :test do
   ruby("test/run-test.rb")
 end
 
 task default: :test
+
+YARD::Rake::YardocTask.new do |task|
+end

unicode_plot.gemspec

@@ -34,4 +34,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "bundler", ">= 1.17"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "test-unit"
+  spec.add_development_dependency "yard"
 end