diff --git a/lua/configs/formatter.lua b/lua/configs/formatter.lua
index 489aceb..5d3da48 100644
--- a/lua/configs/formatter.lua
+++ b/lua/configs/formatter.lua
@@ -11,12 +11,23 @@ local function config()
 			-- sudo pacman -S stylua
 			-- https://github.com/JohnnyMorganz/StyLua/releases
 			lua = { fmt_lua.stylua },
-			-- pip install isort black
-			-- TODO: ruff format, depending on the project
+			-- pip install isort black ruff
 			python = {
 				fmt_python.isort,
-				fmt_python.ruff,
-				-- fmt_python.black,
+				function()
+					-- use `black` or `ruff` based on the project dir
+					local cwd = vim.fn.getcwd()
+					-- substr the cwd starting at the last "/" character
+					local cwd_name = string.sub(cwd, -cwd:reverse():find('/') + 1)
+					local style = {
+						['invsys'] = fmt_python.black,
+						['invsys-b'] = fmt_python.black,
+						['invsys-c'] = fmt_python.black,
+						['cubix'] = fmt_python.ruff,
+						['slots'] = fmt_python.ruff,
+					}
+					return style[cwd_name] or nil
+				end,
 			},
 			-- sudo npm i -g fixjson
 			json = { fmt_json.fixjson },