Update skeleton plugin

plugins/skeleton/skeleton.cpp

@@ -10,21 +10,27 @@
 #include "DataDefs.h"
 //#include "df/world.h"
 
+// our own, empty header.
+#include "skeleton.h"
+
 using namespace DFHack;
 using namespace df::enums;
 
-// our own, empty header.
-#include "skeleton.h"
+// A plugin must be able to return its name and version.
+// The name string provided must correspond to the filename -
+// skeleton.plug.so, skeleton.plug.dylib, or skeleton.plug.dll in this case
+DFHACK_PLUGIN("skeleton");
 
+// Any globals a plugin requires (e.g. world) should be listed here.
+// For example, this line expands to "using df::global::world" and prevents the
+// plugin from being loaded if df::global::world is null (i.e. missing from symbols.xml):
+//
+// REQUIRE_GLOBAL(world);
 
 // Here go all the command declarations...
 // mostly to allow having the mandatory stuff on top of the file and commands on the bottom
 command_result skeleton (color_ostream &out, std::vector <std::string> & parameters);
 
-// A plugin must be able to return its name and version.
-// The name string provided must correspond to the filename - skeleton.plug.so or skeleton.plug.dll in this case
-DFHACK_PLUGIN("skeleton");
-
 // Mandatory init function. If you have some global state, create it here.
 DFhackCExport command_result plugin_init (color_ostream &out, std::vector <PluginCommand> &commands)
 {

plugins/skeleton/skeletonShort.cpp

@@ -8,9 +8,10 @@
 
 using namespace DFHack;
 
-command_result skeleton2 (color_ostream &out, std::vector <std::string> & parameters);
-
 DFHACK_PLUGIN("skeleton2");
+//REQUIRE_GLOBAL(world);
+
+command_result skeleton2 (color_ostream &out, std::vector <std::string> & parameters);
 
 DFhackCExport command_result plugin_init (color_ostream &out, std::vector <PluginCommand> &commands)
 {