Add python black and isort as LSP formatter using EFM

lua/config_lsp.lua

@@ -29,7 +29,9 @@ local on_attach = function(client, bufnr)
     vim.keymap.set('n', '<leader>rn', vim.lsp.buf.rename, bufopts)
     vim.keymap.set('n', '<leader>ca', vim.lsp.buf.code_action, bufopts)
     vim.keymap.set('n', 'gr', vim.lsp.buf.references, bufopts)
-    vim.keymap.set('n', '<leader>i', vim.lsp.buf.formatting, bufopts)
+    vim.keymap.set('n', '<leader>i', function ()
+        vim.lsp.buf.format({timeout_ms=10000,async=false})  -- async=true is strange behavior
+    end, bufopts)
     -- Enable aerial support
     require("aerial").on_attach(client, bufnr)
 end
@@ -136,6 +138,19 @@ elseif file_exists(pylsp_file) then
     }
 end
 
+require('lspconfig')['efm'].setup{
+    init_options = {documentFormatting = true},
+    settings = {
+        languages = {
+            python = {
+                {formatCommand = 'black --quiet -', formatStdin = true},
+                {formatCommand = 'isort --quiet -', formatStdin = true},
+            },
+        },
+    },
+    filetypes = {'python'},
+}
+
 require('lspconfig')['fortls'].setup{
     cmd = {os.getenv( "HOME" ).."/.pyenv/versions/neovim3/bin/fortls"},
     on_attach = on_attach,

lua/keymaps.lua

@@ -17,7 +17,6 @@ nmap('<leader>sr', ':SnipRun<cr>')
 nmap('<leader>gf', ':Git fetch<cr>')
 nmap('<leader>gp', ':Git pull<cr>')
 nmap('<leader>gP', ':Git push<cr>')
-nmap('<leader>i', ':!black % ; zimports %<cr>')
 
 -- Telescope
 nmap('<leader>;', '<cmd>Telescope builtin<cr>')