workaround for broken lua api with minetest.get_content_id *crashing* for non-existing nodes

init.lua

@@ -19,30 +19,39 @@ moresnow.crazy_mode          = true
 -- end of configuration
 --------------------------------------------------------------------------------
 
+-- which shapes can we cover?
+moresnow.shapes = {'top', 'fence_top', 'stair_top', 'slab_top',
+			'panel_top', 'micro_top', 'outer_stair_top', 'inner_stair_top',
+			'ramp_top', 'ramp_outer_top', 'ramp_inner_top'}
+
+-- which snow node equivals which leaves node?
+moresnow.nodetypes = {'snow','autumnleaves'}
+
+-- adjustment for an annoying breaking change in the lua api
+moresnow.get_cid = function(node_name)
+	if(not(node_name)
+	  or (not(minetest.registered_nodes[node_name]) and not(minetest.registered_aliases[node_name]))) then
+		return nil
+	end
+	return minetest.get_content_id(node_name)
+end
+
 -- defines the on_construct function for falling/placed snow(balls)
 dofile(minetest.get_modpath("moresnow")..'/snow_on_construct.lua');
--- which snow node equivals which leaves node?
-moresnow.nodetypes = {'snow','autumnleaves'};
 -- devines the 8 types of snow covers: general nodebox snow cover, stairs, slabs,
 -- outer edge stair, inner edge stair, 3x homedecor shingles/technic cnc shapes
 dofile(minetest.get_modpath("moresnow")..'/snow_cover_nodes.lua');
 moresnow.build_translation_table();
 
 -- some defines which fascilitate identification of nodes
-moresnow.c_ignore           = minetest.get_content_id( 'ignore' );
-moresnow.c_air              = minetest.get_content_id( 'air' );
-moresnow.c_snow             = minetest.get_content_id( 'default:snow' );
-moresnow.c_snow_top         = minetest.get_content_id( 'moresnow:snow_top' );
-moresnow.c_snow_fence       = minetest.get_content_id( 'moresnow:snow_fence_top' );
-moresnow.c_snow_stair       = minetest.get_content_id( 'moresnow:snow_stair_top' );
-moresnow.c_snow_slab        = minetest.get_content_id( 'moresnow:snow_slab_top' );
-moresnow.c_snow_panel       = minetest.get_content_id( 'moresnow:snow_panel_top' );
-moresnow.c_snow_micro       = minetest.get_content_id( 'moresnow:snow_micro_top' );
-moresnow.c_snow_outer_stair = minetest.get_content_id( 'moresnow:snow_outer_stair_top' );
-moresnow.c_snow_inner_stair = minetest.get_content_id( 'moresnow:snow_inner_stair_top' );
-moresnow.c_snow_ramp_top    = minetest.get_content_id( 'moresnow:snow_ramp_top' );
-moresnow.c_snow_ramp_outer  = minetest.get_content_id( 'moresnow:snow_ramp_outer_top' );
-moresnow.c_snow_ramp_inner  = minetest.get_content_id( 'moresnow:snow_ramp_inner_top' );
+moresnow.c_ignore           = moresnow.get_cid( 'ignore' );
+moresnow.c_air              = moresnow.get_cid( 'air' );
+moresnow.c_snow             = moresnow.get_cid( 'default:snow' );
+-- create some suitable aliases
+for _, v in ipairs(moresnow.shapes) do
+	moresnow['c_snow_'..v] = moresnow.get_cid('moresnow:snow_'..v)
+end
+
 
 -- takes a look at all defined nodes after startup and stores which shape they are;
 -- this is important for finding the right snow cover to put on the shape below

snow_analyze_shapes.lua

@@ -10,7 +10,7 @@ moresnow.snow_param2_offset = {};
 -- homedecor 3d shingles and technic cnc items are handled here
 moresnow.identify_special_slopes = function( new_name, homedecor_prefix, technic_postfix, param2_offset )
 	-- these nodes are only supported if homedecor and/or technic are installed
-	local c_new_snow_node = minetest.get_content_id( new_name );
+	local c_new_snow_node = moresnow.get_cid( new_name )
 	if( not( c_new_snow_node )) then
 		return;
 	end
@@ -20,7 +20,7 @@ moresnow.identify_special_slopes = function( new_name, homedecor_prefix, technic
 					'tree','steelblock','bronzeblock','stainless_steel','marble','granite'};
 
 	for _,v in ipairs( homedecor_materials ) do
-		local id = minetest.get_content_id( homedecor_prefix..v );
+		local id = moresnow.get_cid( homedecor_prefix..v )
 		-- the node has to be registered at this point; thus, the soft-dependency on homedecor and technic
 		if( id and id ~= moresnow.c_ignore ) then
 			moresnow.snow_cover[ id ] = c_new_snow_node;
@@ -32,7 +32,7 @@ moresnow.identify_special_slopes = function( new_name, homedecor_prefix, technic
 			prefix = 'technic:';
 		end
 
-		local id = minetest.get_content_id( prefix..v..technic_postfix );
+		local id = moresnow.get_cid( prefix..v..technic_postfix )
 		-- the node has to be registered at this point; thus, the soft-dependency on homedecor and technic
 		if( id and id ~= moresnow.c_ignore ) then
 			moresnow.snow_cover[                 id ] = c_new_snow_node;
@@ -53,7 +53,7 @@ moresnow.identify_stairs_and_slabs = function()
 
 	for n,v in pairs( minetest.registered_nodes ) do
 
-		local id = minetest.get_content_id( n );
+		local id = moresnow.get_cid( n )
 
 		if( not( id ) or moresnow.snow_cover[ id ] ) then
 
@@ -192,7 +192,7 @@ end
 minetest.after( 0, moresnow.identify_stairs_and_slabs );
 
 -- no snow on lava or flowing water
-moresnow.snow_cover[ minetest.get_content_id( 'default:lava_source')        ] = moresnow.c_air;
-moresnow.snow_cover[ minetest.get_content_id( 'default:lava_flowing')       ] = moresnow.c_air;
-moresnow.snow_cover[ minetest.get_content_id( 'default:water_flowing')      ] = moresnow.c_air;
-moresnow.snow_cover[ minetest.get_content_id( 'default:river_water_flowing')] = moresnow.c_air;
+moresnow.snow_cover[ moresnow.get_cid( 'default:lava_source')        ] = moresnow.c_air
+moresnow.snow_cover[ moresnow.get_cid( 'default:lava_flowing')       ] = moresnow.c_air
+moresnow.snow_cover[ moresnow.get_cid( 'default:water_flowing')      ] = moresnow.c_air
+moresnow.snow_cover[ moresnow.get_cid( 'default:river_water_flowing')] = moresnow.c_air

snow_on_construct.lua

@@ -3,24 +3,20 @@
 moresnow.translation_table = {}
 
 moresnow.build_translation_table = function()
-	local shapes    = {'top', 'fence_top', 'stair_top', 'slab_top',
-				'panel_top', 'micro_top', 'outer_stair_top', 'inner_stair_top',
-				'ramp_top', 'ramp_outer_top', 'ramp_inner_top' };
-
 	for _,t in ipairs(moresnow.nodetypes) do 
 
 		moresnow.translation_table[ t ] = {};
 
-		for _,v in ipairs( shapes ) do
-			local id1 = minetest.get_content_id( 'moresnow:snow_'..v );
-			local id2 = minetest.get_content_id( 'moresnow:'..t..'_'..v );
+		for _,v in ipairs( moresnow.shapes ) do
+			local id1 = moresnow.get_cid( 'moresnow:snow_'..v )
+			local id2 = moresnow.get_cid( 'moresnow:'..t..'_'..v )
 			if( id1 ) then 
 				moresnow.translation_table[ t ][ id1 ] = id2;
 			end
 		end
 
-		local id1 = minetest.get_content_id( 'default:snow' );
-		local id2 = minetest.get_content_id( 'moresnow:'..t );
+		local id1 = moresnow.get_cid( 'default:snow' )
+		local id2 = moresnow.get_cid( 'moresnow:'..t )
 		if( id1 ) then
 			moresnow.translation_table[ t ][ id1 ] = id2;
 		end
@@ -168,7 +164,7 @@ moresnow.on_construct_select_shape = function( pos, falling_node_name, default_n
 		return;
 	end
 
-	local res  = moresnow.suggest_snow_type( minetest.get_content_id( node1.name ), node1.param2 );
+	local res  = moresnow.suggest_snow_type( moresnow.get_cid( node1.name ), node1.param2 )
 
 	-- snow_top is a special node suitable for nodeboxes; BUT: it only looks acceptable if the
 	-- node below that nodebox/torch/fence/etc is a solid one
@@ -190,7 +186,7 @@ moresnow.on_construct_select_shape = function( pos, falling_node_name, default_n
 			end
 			return { remove_node = true};
 		end
-		local new_id2 = moresnow.snow_cover[ minetest.get_content_id( node2.name )];
+		local new_id2 = moresnow.snow_cover[ moresnow.get_cid( node2.name )]
 		-- if the node below this one can't handle a normal snow cover, we can't put a snow top on our node either
 		if( not( new_id2 ) or new_id2 ~= moresnow.c_snow) then
 			return { remove_node = true};