Groups for spawning vines

- Easily lets vines spawn on nodes that have the unique vine group name

- Updated README.md that explains the groups spawning feature.

- Made groups variable local to the registration function and not part of the
  namespace

README.md

@@ -10,11 +10,20 @@
 - Jungle vines that spawn on the side of jungletrees
 
 ## API
-The API is very minimal. It allows the registering of vines.
+The API is very minimal. It allows the registering of vines and the spawning of
+existing vines on nodes of your own.
+
+If you want vines to spawn on a certain node then you can choose which vine you
+would like to spawn on by adding to the node it's group one of the following.
+
+
+
+
 
 There are two types of vines. One that spawns at the bottom of nodes and uses the
 plantlike drawtype, and vines that spawn on the side that use signlike
-drawtype.
+drawtype. The type is determined by the spawn_on_side property in the biome
+table.
 
 ### Example
 *taken from mod*

functions.lua

@@ -3,6 +3,11 @@ vines.register_vine = function( name, defs, biome )
   local drop_node = 'vines:'..name
   local drawtype = ''
   local selection_box
+  local groups = { vines=1, snappy=3, flammable=2 }
+
+  local group_name = name..'_vines'
+  biome.spawn_surfaces[ #biome.spawn_surfaces ] = group_name
+
   if ( biome.spawn_on_side ) then
     selection_box = {
       type = "wallmounted",
@@ -31,7 +36,7 @@ vines.register_vine = function( name, defs, biome )
     tile_images = { "vines_"..name..".png" },
     drawtype = drawtype,
     inventory_image = "vines_"..name..".png",
-    groups = vines.groups,
+    groups = groups,
     sounds = default.node_sound_leaves_defaults(),
     selection_box = selection_box,
     on_construct = function( pos )
@@ -71,7 +76,7 @@ vines.register_vine = function( name, defs, biome )
     wield_image = "vines_"..name..".png",
     drawtype = drawtype,
     inventory_image = "vines_"..name..".png",
-    groups = vines.groups,
+    groups = groups,
     sounds = default.node_sound_leaves_defaults(),
     selection_box = selection_box,
     on_destruct = function( pos )
@@ -94,7 +99,6 @@ vines.register_vine = function( name, defs, biome )
       local node = nodes[ index ]
       if index > #nodes then return registered end
       if minetest.registered_nodes[node] then
-        print('overiding: '..node)
         minetest.override_item( node, defs )
         registered[#registered+1] = node
       end

init.lua

@@ -1,6 +1,5 @@
 vines = {
   name = 'vines',
-  groups = { vines=1, snappy=3, flammable=2 },
   recipes = {}
 }
 
@@ -10,6 +9,5 @@ dofile( minetest.get_modpath( vines.name ) .. "/crafts.lua" )
 dofile( minetest.get_modpath( vines.name ) .. "/nodes.lua" )
 dofile( minetest.get_modpath( vines.name ) .. "/shear.lua" )
 dofile( minetest.get_modpath( vines.name ) .. "/vines.lua" )
-dofile( minetest.get_modpath( vines.name ) .. "/spawning.lua" )
 
 print("[Vines] Loaded!")