Add -Xproperties to list properties (equivalent to --properties)

Author: headius

argparser.cpp

@@ -39,7 +39,7 @@ Options:\n\
   -Xtrace <path>        path for launcher log (for troubleshooting)\n\
   -Xcommand             just print the equivalent java command and exit\n\
   -Xprop.erty[=value]   equivalent to -J-Djruby.<prop.erty>[=value]\n\
-                          see --properties for a list (omit \"jruby.\" with -X\n"
+  -Xproperties          list supported properties (omit \"jruby.\" with -X)\n"
 #ifdef WIN32
 "  -Xconsole <mode>      jrubyw console attach mode (new|attach|suppress)\n\n"
 #endif
@@ -318,6 +318,8 @@ bool ArgParser::parseArgs(int argc, char *argv[]) {
         } else if (strcmp(it->c_str(), "-Xversion") == 0) {
             printToConsole("JRuby Launcher Version " JRUBY_LAUNCHER_VERSION "\n");
             return false;
+        } else if (strcmp(it->c_str(), "-Xproperties") == 0) {
+			progArgs.push_back(std::string("--properties"));
         } else if (it->compare(0, 2, "-X", 2) == 0 && islower(it->c_str()[2])) {
 	        // Any other /-X([a-z].*)/ get turned into a -Djruby.\1 property
 			std::string propPart = it->substr(2);

spec/launcher_spec.rb

@@ -64,6 +64,10 @@
     jruby_launcher_args("-Xprop.erty=value").should include("-Djruby.prop.erty=value")
   end
 
+  it "should pass -Xproperties as --properties" do
+    jruby_launcher_args("-Xproperties").should include("--properties")
+  end
+
   it "should default to 500m max heap" do
     jruby_launcher_args("").should include("-Xmx500m", "-Djruby.memory.max=500m")
   end