Implement basic pickblock functionality (on rightclick)

mods/PLAYER/vl_pickblock/LICENSE

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+MIT License
+
+Copyright (c) 2022 ROllerozxa
+Copyright (c) 2024 Mikita 'rudzik8' Wiśniewski
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

mods/PLAYER/vl_pickblock/README.md

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+# `vl_pickblock`
+
+Allows you to put the selected node in an empty slot of your hotbar when you're in creative mode.
+
+You select them with the build key (right-click) as compared to with middle-click as it usually is in Minecraft.
+
+
+## License
+
+Copyright (C) 2022 ROllerozxa\
+Copyright (C) 2024 Mikita 'rudzik8' Wiśniewski
+
+MIT (see `LICENSE` file)

mods/PLAYER/vl_pickblock/init.lua

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+minetest.override_item("", {
+	on_place = function(itemstack, placer, pointed_thing)
+		if minetest.is_creative_enabled(placer:get_player_name()) then
+			local node = minetest.get_node_or_nil(pointed_thing.under)
+			if not node then return end
+
+			local def = minetest.registered_nodes[node.name]
+			if not def then return end
+
+			local rnode
+			-- if this is an 'illegal' node and there's an explicit `_vl_pickblock` field, then return it
+			-- if the node isn't 'illegal', return it as-is
+			-- (and if it's 'illegal' and no `_vl_pickblock` is defined, well, bad luck)
+			if def.groups.not_in_creative_inventory and def.groups.not_in_creative_inventory ~= 0 then
+				if def._vl_pickblock then
+					rnode = def._vl_pickblock
+				end
+			else
+				rnode = node.name
+			end
+
+			return {name = rnode}
+		end
+	end
+})

mods/PLAYER/vl_pickblock/mod.conf

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+name = vl_pickblock
+description = Allows you to put the selected node in an empty slot of your hotbar when you're in creative mode.