From b3467b5093f3f15f655737556a94acbabe90e4b3 Mon Sep 17 00:00:00 2001
From: BuckarooBanzay <BuckarooBanzay@users.noreply.github.com>
Date: Thu, 6 Jan 2022 21:17:37 +0100
Subject: [PATCH] singleblock mapgen / some indent fixes

---
 examples/deserialize_options.lua | 10 +++++-----
 examples/singleblock_mapgen.lua  | 11 +++++++++++
 init.lua                         |  5 ++++-
 mapgens/singleblock.lua          | 32 ++++++++++++++++++++++++++++++++
 4 files changed, 52 insertions(+), 6 deletions(-)
 create mode 100644 examples/singleblock_mapgen.lua
 create mode 100644 mapgens/singleblock.lua

diff --git a/examples/deserialize_options.lua b/examples/deserialize_options.lua
index 70e531e..b1b1d11 100644
--- a/examples/deserialize_options.lua
+++ b/examples/deserialize_options.lua
@@ -17,12 +17,12 @@ local options = {
 			}
 		},
 
-        -- replace certain nodes with others
+		-- replace certain nodes with others
 		replace = {
 			["default:dirt"] = "default:mese"
 		},
 
-        -- bulk set param2 for certain nodes, useful for mass-coloring
+		-- bulk set param2 for certain nodes, useful for mass-coloring
 		set_param2 = {
 			["unifiedbricks:brickblock"] = 15
 		}
@@ -39,7 +39,7 @@ local options = {
 		end
 	end,
 
-    -- placement mode "replace": replace the whole mapblock, "add": replace only air nodes
+	-- placement mode "replace": replace the whole mapblock, "add": replace only air nodes
 	mode = "replace"
 }
 
@@ -53,6 +53,6 @@ local filename = minetest.get_modpath("my_mod") .. "/schematics/my_mapblock"
 local success, msg = mapblock_lib.deserialize(mapblock_pos, filename, options)
 
 if not success then
-    -- not successful, abort with error
-    error(msg)
+	-- not successful, abort with error
+	error(msg)
 end
diff --git a/examples/singleblock_mapgen.lua b/examples/singleblock_mapgen.lua
new file mode 100644
index 0000000..8fa76af
--- /dev/null
+++ b/examples/singleblock_mapgen.lua
@@ -0,0 +1,11 @@
+-- singleblock mapgen example, places a single mapblock _everywhere_
+
+local MP = minetest.get_modpath("my_mod")
+
+-- create a mapgen function for a single mapblock
+local fn = mapblock_lib.mapgens.singleblock({
+    filename = MP .. "/schemas/mymapblock"
+})
+
+-- register it
+minetest.register_on_generated(fn)
\ No newline at end of file
diff --git a/init.lua b/init.lua
index 3946863..af40496 100644
--- a/init.lua
+++ b/init.lua
@@ -1,5 +1,6 @@
 mapblock_lib = {
-	schema_path = minetest.get_worldpath() .. "/mapblocks"
+	schema_path = minetest.get_worldpath() .. "/mapblocks",
+	mapgens = {}
 }
 
 -- create global schema_path
@@ -28,3 +29,5 @@ dofile(MP .. "/validate.lua")
 dofile(MP .. "/display.lua")
 dofile(MP .. "/chatcommands/single.lua")
 dofile(MP .. "/chatcommands/multi.lua")
+
+dofile(MP .. "/mapgens/singleblock.lua")
\ No newline at end of file
diff --git a/mapgens/singleblock.lua b/mapgens/singleblock.lua
new file mode 100644
index 0000000..02e8bb7
--- /dev/null
+++ b/mapgens/singleblock.lua
@@ -0,0 +1,32 @@
+---------
+-- singleblock mapgen helper
+
+--- creates a new mapgen-function that generates a single mapblock,
+--- the resulting function can be passed to `minetest.register_on_generated`
+-- @see singleblock_mapgen.lua
+-- @param cfg configuration table
+-- @param cfg.filename the filename of the mapblock to use
+-- @param cfg.filter an optional filter function of the type `fn(blockpos)`, returning true means the mapblock is placed
+-- @param cfg.options optional table for `mapblock_lib.deserialize`
+function mapblock_lib.mapgens.singleblock(cfg)
+    cfg.filter = cfg.filter or function() return true end
+    cfg.options = cfg.options or { use_cache = true }
+    assert(cfg.filename, "missing schema filename")
+
+    return function(minp, maxp)
+        local min_block = mapblock_lib.get_mapblock(minp)
+        local max_block = mapblock_lib.get_mapblock(maxp)
+
+        for x=min_block.x, max_block.x do
+            for y=min_block.y, max_block.y do
+                for z=min_block.z, max_block.z do
+                    local mapblock_pos = {x=x, y=y, z=z}
+                    local do_place = cfg.filter(mapblock_pos)
+                    if do_place then
+                        mapblock_lib.deserialize(mapblock_pos, cfg.filename, cfg.options)
+                    end
+                end
+            end
+        end
+    end
+end
\ No newline at end of file