Detect legacy formatters

templates/nvim/lua/formatting.lua.j2

@@ -1,6 +1,18 @@
 -- {{ ansible_managed }}
 
 local enable_formatting = vim.env.enable_formatting == 'true';
+local legacy_formatting = nil;
+
+-- TODO: move to utils file
+-- TODO: add efm-languageserver to lsp.lua
+if vim.env.VIRTUAL_ENV ~= nil and enable_formatting == true then
+  local formatters = vim.fs.find(
+    { 'isort', 'black' },
+    { limit = 1, type = 'file', path = vim.fs.joinpath(vim.env.VIRTUAL_ENV, 'bin') }
+  )
+
+  legacy_formatting = #formatters > 0;
+end
 
 if (enable_formatting) then
   vim.api.nvim_create_autocmd('LspAttach', {
@@ -14,7 +26,10 @@ if (enable_formatting) then
           callback = function()
             vim.lsp.buf.format {
               async = false,
-              id = args.data.client_id
+              id = args.data.client_id,
+              filter = function(format_client)
+                return format_client.name ~= 'ruff' or not legacy_formatting
+              end
             }
           end,
         })