[ruby/optparse] Moved rdoc files to doc/optparse

cccb28e0de

doc/optparse/ruby/missing_options.rb

@@ -0,0 +1,12 @@
+require 'optparse'
+parser = OptionParser.new
+parser.on('-x', '--xxx', 'Short and long, no argument')
+parser.on('-yYYY', '--yyy', 'Short and long, required argument')
+parser.on('-z [ZZZ]', '--zzz', 'Short and long, optional argument')
+options = {}
+parser.parse!(into: options)
+required_options = [:xxx, :zzz]
+missing_options = required_options - options.keys
+unless missing_options.empty?
+  fail "Missing required options: #{missing_options}"
+end