feat(functions): auto format on save by ESLint if possible

lua/lsp/functions.lua

@@ -1,14 +1,33 @@
 local M = {}
 
 function M.enable_format_on_save()
-	local group = vim.api.nvim_create_augroup("format_on_save", { clear = false })
-	vim.api.nvim_create_autocmd("BufWritePre", {
-		callback = function()
-			vim.lsp.buf.format()
-		end,
-		group = group,
-	})
-	require("notify")("Enabled format on save", "info", { title = "LSP", timeout = 2000 })
+    local group = vim.api.nvim_create_augroup("format_on_save", { clear = false })
+    vim.api.nvim_create_autocmd("BufWritePre", {
+        callback = function()
+            local root_dir = vim.fn.getcwd()  -- Adjust this if you have a more accurate way to find the project root
+            local eslintrc_json = root_dir .. "/.eslintrc.json"
+            local eslintrc_js = root_dir .. "/.eslintrc.js"
+
+            -- Check if eslint LSP is active
+            local active_clients = vim.lsp.buf_get_clients()
+            local eslint_is_active = false
+
+            for _, client in ipairs(active_clients) do
+                if client.name == "eslint" then
+                    eslint_is_active = true
+                    break
+                end
+            end
+
+            if eslint_is_active and (vim.fn.filereadable(eslintrc_json) == 1 or vim.fn.filereadable(eslintrc_js) == 1) then
+                vim.cmd("EslintFixAll")
+            else
+                vim.lsp.buf.format()
+            end
+        end,
+        group = group,
+    })
+    require("notify")("Enabled format on save", "info", { title = "LSP", timeout = 2000 })
 end
 
 function M.disable_format_on_save()