Add conform.nvim for auto-formatting

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lua/lsp.lua

@@ -1,5 +1,45 @@
 local lazy = require("lazy")
 
+-- conform.nvim - BufWritePre 懒加载
+local function setup_conform()
+    local function biome_or_prettier()
+        if vim.fs.find({ "biome.json", "biome.jsonc" }, { upward = true, stop = vim.uv.os_homedir() })[1] then
+            return { "biome-check", "biome", stop_after_first = true }
+        end
+        return { "prettier" }
+    end
+
+    require("conform").setup({
+        formatters_by_ft = {
+            lua = { "stylua" },
+            go = { "gofumpt", "goimports" },
+            javascript = biome_or_prettier,
+            typescript = biome_or_prettier,
+            javascriptreact = biome_or_prettier,
+            typescriptreact = biome_or_prettier,
+            json = biome_or_prettier,
+            css = { "prettier" },
+            html = { "prettier" },
+            markdown = { "prettier" },
+            toml = { "taplo" },
+        },
+        format_on_save = function(bufnr)
+            if vim.b[bufnr].autoformat == false or vim.g.autoformat == false then
+                return nil
+            end
+            return { timeout_ms = 500, lsp_fallback = true }
+        end,
+    })
+end
+
+lazy.on_event("conform", "BufWritePre", "*", function(args)
+    setup_conform()
+    -- 首次保存时手动触发格式化（setup 注册的 autocmd 不会在同一次事件中生效）
+    if vim.b[args.buf].autoformat ~= false and vim.g.autoformat ~= false then
+        require("conform").format({ bufnr = args.buf, timeout_ms = 500, lsp_fallback = true })
+    end
+end)
+
 -- mason + LSP 配置延迟到 VimEnter，避免启动时加载
 lazy.on_event("lsp", "VimEnter", "*", function()
     require("mason").setup()
@@ -34,7 +74,10 @@ end)
 -- LSP keymaps
 vim.keymap.set("n", "gd", vim.lsp.buf.definition, { desc = "Go to definition" })
 vim.keymap.set("n", "gh", vim.lsp.buf.hover, { desc = "Hover" })
-vim.keymap.set("n", "<leader>fm", vim.lsp.buf.format, { desc = "Format Local buffer" })
+vim.keymap.set("n", "<leader>fm", function()
+    lazy.load("conform", setup_conform)
+    require("conform").format({ lsp_fallback = true })
+end, { desc = "Format buffer" })
 vim.keymap.set("n", "df", vim.diagnostic.open_float, { desc = "Show line diagnostics" })
 vim.keymap.set("n", "<leader>ca", vim.lsp.buf.code_action, { desc = "Code action" })
 

lua/pack.lua

@@ -6,6 +6,7 @@ vim.pack.add({
     { src = "https://github.com/nvim-treesitter/nvim-treesitter", branch = "main" },
     "https://github.com/neovim/nvim-lspconfig",
     "https://github.com/mason-org/mason.nvim",
+    "https://github.com/stevearc/conform.nvim",
     "https://github.com/tpope/vim-fugitive",
 })
 

nvim-pack-lock.json

@@ -1,5 +1,9 @@
 {
   "plugins": {
+    "conform.nvim": {
+      "rev": "619363c30309d29ffa631e67c8183f2a72caa373",
+      "src": "https://github.com/stevearc/conform.nvim"
+    },
     "friendly-snippets": {
       "rev": "6cd7280adead7f586db6fccbd15d2cac7e2188b9",
       "src": "https://github.com/rafamadriz/friendly-snippets"