return argument value when nargs = 1

lib/yawpa.rb

@@ -9,6 +9,7 @@ require "yawpa/version"
 # }
 module Yawpa
   class UnknownOptionException < Exception; end
+  class InvalidArgumentsException < Exception; end
 
   module_function
   def parse(params, options)
@@ -17,24 +18,42 @@ module Yawpa
     i = 0
     while i < params.length
       param = params[i]
-      if param =~ /^(-+)(.+)$/
-        case $1.length
+      if param =~ /^(-+)([^=]+)(=.+)?$/
+        leader, param_name, val = $1, $2, $3
+        case leader.length
         when 2
-          param_key = if options[$2]
-                        $2
-                      elsif options[$2.to_sym]
-                        $2.to_sym
+          param_key = if options[param_name]
+                        param_name
+                      elsif options[param_name.to_sym]
+                        param_name.to_sym
                       else
                         nil
                       end
           if param_key.nil?
-            raise UnknownOptionException.new("Unknown option '#{param}'")
+            raise UnknownOptionException.new("Unknown option '#{param_name}'")
           end
           opt_config = options[param_key]
           nargs = opt_config[:nargs] || 0
           if nargs == 0
             opts[param_key] = true
-          elsif nargs.class == FixNum
+          elsif nargs.class == Fixnum
+            n_gathered = 0
+            opts[param_key] = []
+            if val
+              opts[param_key] << val[1, val.length]
+              n_gathered += 1
+            end
+            while n_gathered < nargs
+              if i + 1 >= params.length
+                raise InvalidArgumentsException.new("Not enough arguments supplied for option '#{param_name}'")
+              end
+              i += 1
+              opts[param_key] << params[i]
+              n_gathered += 1
+            end
+            if n_gathered == 1
+              opts[param_key] = opts[param_key][0]
+            end
           elsif nargs.class == Range
           end
         end