Add nushell support to Topiary (WIP)

• Topiary: tree-sitter based uniform formatter
• This repo contains:
  • languages.ncl: configuration that enables nushell
  • nushell.scm: tree-sitter query DSL that defines the behavior of formatter for nushell
  • stand-alone tests written in nushell

setup

1. install topiary-cli (0.5.1 above)
2. clone this repo to $env.XDG_CONFIG_HOME/topiary
3. set environment variables

$env.TOPIARY_CONFIG_FILE = ($env.XDG_CONFIG_HOME | path join topiary languages.ncl)
$env.TOPIARY_LANGUAGE_DIR = ($env.XDG_CONFIG_HOME | path join topiary languages)

4. update languages.ncl if Nickel error detected: grammar.source.git fits recent updates of topiary github while the latest release of topiary-cli still uses the other way.

<       grammar = {
---
>       grammar.source.git = {

usage

• topiary format script.nu
• neovim: format on save with conform.nvim:

-- lazy.nvim setup
{
  "stevearc/conform.nvim",
  dependencies = { "mason.nvim" },
  event = "VeryLazy",
  opts = {
    formatters_by_ft = {
      nu = { "topiary_nu" },
    },
    formatters = {
      topiary_nu = {
        command = "topiary",
        args = { "format", "--language", "nu" },
      },
    },
  },
},

contribute

Help to find format issues with following method (dry-run, detects parsing/idempotence/semantic breaking):

source utils.nu
test_format <root-path-of-your-nushell-scripts>