Version from 2020-12-25 mt-mapper with README

COPYING

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+Copyright (c) 2013-2014, Miroslav Bendík and various contributors (see AUTHORS)
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met: 
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer. 
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution. 
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.txt

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+dumpnodes
+=========
+
+dumpnodes is a tiny little mod that accompanies the mt-mapper program for
+generating top-down world maps.
+
+Dumpnodes adds one command `/dumpnodes` that will dump all of the node 
+definitions in your minetest world to a text file 'nodes.txt' in the world 
+directory. It is included with mt-mapper but this is a standalone version.
+
+This particular mod was written by sfan5.

init.lua

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+local function get_tile(tiles, n)
+	local tile = tiles[n]
+	if type(tile) == 'table' then
+		return tile.name
+	end
+	return tile
+end
+
+local function pairs_s(dict)
+	local keys = {}
+	for k in pairs(dict) do
+		keys[#keys+1] = k
+	end
+	table.sort(keys)
+	return ipairs(keys)
+end
+
+minetest.register_chatcommand("dumpnodes", {
+	description = "Dump node and texture list for use with minetestmapper",
+	func = function()
+		local ntbl = {}
+		for _, nn in pairs_s(minetest.registered_nodes) do
+			local prefix, name = nn:match('(.*):(.*)')
+			if prefix == nil or name == nil then
+				print("ignored(1): " .. nn)
+			else
+				if ntbl[prefix] == nil then
+					ntbl[prefix] = {}
+				end
+				ntbl[prefix][name] = true
+			end
+		end
+		local out, err = io.open(minetest.get_worldpath() .. "/nodes.txt", 'wb')
+		if not out then
+			return true, err
+		end
+		local n = 0
+		for _, prefix in pairs_s(ntbl) do
+			out:write('# ' .. prefix .. '\n')
+			for _, name in pairs_s(ntbl[prefix]) do
+				local nn = prefix .. ":" .. name
+				local nd = minetest.registered_nodes[nn]
+				local tiles = nd.tiles or nd.tile_images
+				if tiles == nil or nd.drawtype == 'airlike' then
+					print("ignored(2): " .. nn)
+				else
+					local tex = get_tile(tiles, 1)
+					tex = (tex .. '^'):match('%(*(.-)%)*^') -- strip modifiers
+					if tex:find("[combine", 1, true) then
+						tex = tex:match('.-=([^:]-)') -- extract first texture
+					end
+					out:write(nn .. ' ' .. tex .. '\n')
+					n = n + 1
+				end
+			end
+			out:write('\n')
+		end
+		out:close()
+		return true, n .. " nodes dumped."
+	end,
+})

mod.conf

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+name = dumpnodes
+description = minetestmapper development mod (node dumper)