allows negative numeric arguments

Author: hstove

lib/thor/parser/arguments.rb

@@ -1,6 +1,6 @@
 class Thor
   class Arguments #:nodoc: # rubocop:disable ClassLength
-    NUMERIC = /(\d*\.\d+|\d+)/
+    NUMERIC = /[-+]{0,1}(\d*\.\d+|\d+)/
 
     # Receives an array of args and returns two arrays, one with arguments
     # and one with switches.

spec/parser/arguments_spec.rb

@@ -21,6 +21,10 @@ def parse(*args)
       create :string => nil, :numeric => nil
       expect(parse("name", "13")["string"]).to eq("name")
       expect(parse("name", "13")["numeric"]).to eq(13)
+      expect(parse("name", "+13")["numeric"]).to eq(13)
+      expect(parse("name", "+13.3")["numeric"]).to eq(13.3)
+      expect(parse("name", "-13")["numeric"]).to eq(-13)
+      expect(parse("name", "-13.3")["numeric"]).to eq(-13.3)
     end
 
     it "accepts hashes" do