Add support for autoloading static brushes on server start

worldeditadditions/lib/sculpt/import_static.lua

@@ -0,0 +1,23 @@
+local wea = worldeditadditions
+local Vector3 = wea.Vector3
+
+local parse_static = dofile(wea.modpath.."/lib/sculpt/parse_static.lua")
+
+--- Reads and parses the brush stored in the specified file.
+-- @param	filepath	string		The path to file that contains the static brush to read in.
+-- @returns	true,table,Vector3|false,string		A success boolean, followed either by an error message as a string or the brush (as a table) and it's size (as an X/Y Vector3)
+return function(filepath)
+	local handle = io.open(filepath)
+	if not handle then
+		handle:close()
+		return false, "Error: Failed to open the static brush file at '"..filepath.."'."
+	end
+	
+	local data = handle:read("*all")
+	handle:close()
+	
+	local success, brush, brush_size = parse_static(data)
+	if not success then return success, brush end
+	
+	return true, brush, brush_size
+end

worldeditadditions/lib/sculpt/init.lua

@@ -14,9 +14,14 @@ local sculpt = {
 	preview_brush = dofile(wea.modpath.."/lib/sculpt/preview_brush.lua"),
 	read_brush_static = dofile(wea.modpath.."/lib/sculpt/read_brush_static.lua"),
 	apply_heightmap = dofile(wea.modpath.."/lib/sculpt/apply_heightmap.lua"),
-	apply = dofile(wea.modpath.."/lib/sculpt/apply.lua")
+	apply = dofile(wea.modpath.."/lib/sculpt/apply.lua"),
+	scan_static = dofile(wea.modpath.."/lib/sculpt/scan_static.lua"),
+	import_static = dofile(wea.modpath.."/lib/sculpt/import_static.lua"),
+	parse_static = dofile(wea.modpath.."/lib/sculpt/parse_static.lua")
 }
 
+sculpt.scan_static(wea.modpath.."/lib/sculpt/brushes")
+
 return sculpt
 
 -- TODO: Automatically find & register all text file based brushes in the brushes directory

worldeditadditions/lib/sculpt/parse_static.lua

@@ -0,0 +1,48 @@
+local wea = worldeditadditions
+local Vector3 = wea.Vector3
+
+--- Parses a static brush definition.
+-- @param	source	string	The source string that contains the static brush, formatted as TSV.
+-- @returns	true,table,Vector3|false,string		A success boolean, followed either by an error message as a string or the brush (as a table) and it's size (as an X/Y Vector3)
+return function(source)
+	local width = -1
+	local height
+	local maxvalue, minvalue, range
+	
+	-- Parse out the TSV into a table of tables, while also parsing values as numbers
+	-- Also keeps track of the maximum/minimum values found for rescaling later.
+	local values = wea.table.map(
+		wea.split(source, "\n", false),
+		function(line)
+			local row = wea.split(line, "%s+", false)
+			width = math.max(width, #row)
+			return wea.table.map(
+				row,
+				function(pixel)
+					local value = tonumber(pixel)
+					if not value then value = 0 end
+					if maxvalue == nil or value > maxvalue then
+						maxvalue = value
+					end
+					if minvalue == nil or value < minvalue then
+						minvalue = value
+					end
+					return value
+				end
+			)
+		end
+	)
+	
+	height = #values
+	range = maxvalue - minvalue
+	
+	local brush = {}
+	for y,row in ipairs(values) do
+		for x,value in ipairs(row) do
+			local i = (y-1)*width + (x-1)
+			brush[i] = (value - minvalue) / range
+		end
+	end
+	
+	return true, brush, Vector3.new(width, height, 0)
+end

worldeditadditions/lib/sculpt/scan_static.lua

@@ -0,0 +1,48 @@
+local wea = worldeditadditions
+local Vector3 = wea.Vector3
+
+local import_static = dofile(wea.modpath.."/lib/sculpt/import_static.lua")
+
+local function import_filepath(filepath, name, overwrite_existing)
+	if overwrite_existing and wea.sculpt.brushes[name] ~= nil then
+		return false, "Error: A brush with the name '"..name.."' already exists."
+	end
+	
+	local success, brush, brush_size = import_static(filepath)
+	if not success then return success, "Error while reading from '"..filepath.."': "..brush end
+	
+	wea.sculpt.brushes[name] = {
+		brush = brush,
+		size = brush_size
+	}
+	
+	return true
+end
+
+--- Scans the given directory and imports all static brushes found.
+-- Static brushes have the file extension ".brush.tsv" (without quotes).
+-- @param	dirpath	string		The path to directory that contains the static brushs to import.
+-- @returns	bool,loaded,errors	A success boolean, followed by the number of brushes loaded, followed by the number of errors encountered while loading brushes (errors are logged as warnings with Minetest)
+return function(dirpath, overwrite_existing)
+	if overwrite_existing == nil then overwrite_existing = false end
+	local files = wea.io.scandir_files(dirpath)
+	
+	local brushes_loaded = 0
+	local errors = 0
+	
+	
+	for filename in pairs(files) do
+		if wea.str_ends(filename, ".brush.tsv") then
+			local filepath = dirpath.."/"..filename
+			local name = filepath:gsub(".brush.tsv", "")
+			
+			local success, msg = import_filepath(filepath, name, overwrite_existing)
+			if not success then
+				minetest.log("warning", "[WorldEditAdditions:sculpt] Encountered error when loading brush from '"..filepath.."':"..msg)
+			end
+			brushes_loaded = brushes_loaded + 1
+		end
+	end
+	
+	return true, brushes_loaded, errors
+end