feat(nix): migrate Neovim to Nix (as a symlink)

nix/home/neovim/nvim/lua/plugins/formatting.lua

@@ -0,0 +1,56 @@
+-- Lightweight yet powerful formatter plugin for Neovim
+-- https://github.com/stevearc/conform.nvim
+return {
+  "stevearc/conform.nvim",
+  event = { "BufWritePre", "BufNewFile" },
+  keys = {
+    {
+      "<leader>mp",
+      mode = { "n", "v" },
+      function()
+        require("conform").format({
+          lsp_fallback = true,
+          async = false,
+          timeout_ms = 500,
+        })
+      end,
+      desc = "Format file or range (in visual mode)",
+    },
+  },
+  opts = {
+    formatters = {
+      eslint_d = {
+        command = "eslint_d",
+        args = { "--fix-to-stdout", "--stdin", "--stdin-filename", "$FILENAME" },
+        stdin = true,
+      },
+      nixpkgs_fmt = {
+        command = "nixpkgs-fmt",
+      },
+    },
+    formatters_by_ft = {
+      -- ["*"] = { "codespell" },
+      ["_"] = { "trim_whitespace" },
+      astro = { { "prettierd", "prettier" } },
+      css = { { "prettierd", "prettier" }, "stylelint" },
+      fish = { "fish_indent" },
+      go = { "goimports", "gofumpt" },
+      graphql = { { "prettierd", "prettier" } },
+      html = { { "prettierd", "prettier" } },
+      javascript = { { "prettierd", "prettier" }, "eslint_d" },
+      javascriptreact = { { "prettierd", "prettier" }, "eslint_d" },
+      json = { { "prettierd", "prettier" } },
+      lua = { "stylua" },
+      markdown = { { "prettierd", "prettier" } },
+      mdx = { { "prettierd", "prettier" } },
+      nix = { "nixpkgs_fmt" },
+      python = { "isort", "black" },
+      ruby = { "rubyfmt", "rubocop" },
+      eruby = { "htmlbeautifier" },
+      svelte = { { "prettierd", "prettier" } },
+      typescript = { { "prettierd", "prettier" }, "eslint_d" },
+      typescriptreact = { { "prettierd", "prettier" }, "eslint_d" },
+      yaml = { { "prettierd", "prettier" } },
+    },
+  },
+}