-- =============================================================================
-- conform.lua — 自动格式化
-- =============================================================================

return {
  {
    "stevearc/conform.nvim",
    event = { "BufWritePre" },
    cmd = { "ConformInfo" },
    keys = {
      { "<leader>lf", function() require("conform").format({ async = true, lsp_fallback = true }) end, desc = "格式化" },
    },
    opts = {
      format_on_save = {
        timeout_ms  = 500,
        lsp_fallback = true,
      },
      formatters_by_ft = {
        rust = { "rustfmt" },
        lua  = { "stylua" },
        c    = { "clang-format" },
        cpp  = { "clang-format" },
        python      = { "black", "isort" },
        javascript  = { "prettier" },
        typescript  = { "prettier" },
        json        = { "prettier" },
        yaml        = { "prettier" },
        markdown    = { "prettier" },
        html        = { "prettier" },
        css         = { "prettier" },
        go          = { "gofmt", "goimports" },
        sh          = { "shfmt" },
      },
      formatters = {
        ["clang-format"] = {
          -- 用 prepend_args (不是 args!): 保留 conform 默认的 "-assume-filename $FILENAME".
          -- 若用 args 会覆盖默认值, 导致 clang-format 读 stdin 时丢失文件名 → 语言检测/样式查找出问题.
          -- 优先读项目 .clang-format 文件; 没有该文件时用此内联 4 空格样式兜底.
          prepend_args = { "--style={BasedOnStyle: LLVM, IndentWidth: 4, TabWidth: 4, UseTab: Never, ColumnLimit: 0}" },
        },
      },
    },
  },
}