working

lua/plugins/none-ls.lua

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+-- Format on save and linters
+return {
+  'nvimtools/none-ls.nvim',
+  dependencies = {
+    'nvimtools/none-ls-extras.nvim',
+    'jayp0521/mason-null-ls.nvim', -- ensure dependencies are installed
+  },
+  config = function()
+    local null_ls = require 'null-ls'
+    local formatting = null_ls.builtins.formatting   -- to setup formatters
+    local diagnostics = null_ls.builtins.diagnostics -- to setup linters
+
+    -- list of formatters & linters for mason to install
+    require('mason-null-ls').setup {
+      ensure_installed = {
+        'checkmake',
+        'prettier', -- ts/js formatter
+        'stylua',   -- lua formatter
+        'eslint_d', -- ts/js linter
+        'shfmt',
+        'ruff',
+      },
+      -- auto-install configured formatters & linters (with null-ls)
+      automatic_installation = true,
+    }
+
+    local sources = {
+      diagnostics.checkmake,
+      formatting.prettier.with { filetypes = { 'html', 'json', 'yaml', 'markdown' } },
+      formatting.stylua,
+      formatting.shfmt.with { args = { '-i', '4' } },
+      require('none-ls.formatting.ruff').with { extra_args = { '--extend-select', 'I' } },
+      require 'none-ls.formatting.ruff_format',
+    }
+
+    local augroup = vim.api.nvim_create_augroup('LspFormatting', {})
+    null_ls.setup {
+      -- debug = true, -- Enable debug mode. Inspect logs with :NullLsLog.
+      sources = sources,
+      -- you can reuse a shared lspconfig on_attach callback here
+      on_attach = function(client, bufnr)
+        if client.supports_method 'textDocument/formatting' then
+          vim.api.nvim_clear_autocmds { group = augroup, buffer = bufnr }
+          vim.api.nvim_create_autocmd('BufWritePre', {
+            group = augroup,
+            buffer = bufnr,
+            callback = function()
+              vim.lsp.buf.format { async = false }
+            end,
+          })
+        end
+      end,
+    }
+  end,
+}