Wyn for Neovim

Syntax highlighting and language server support for Wyn.

Features

• Syntax highlighting for all keywords, 27 modules, operators, string interpolation
• LSP integration via wyn lsp — completions, hover, go-to-definition, references, rename, format
• Filetype detection for .wyn files
• Smart indentation, code folding, comment toggling

Install

lazy.nvim

{ "wynlang/nvim-wyn", ft = "wyn" }

packer.nvim

use "wynlang/nvim-wyn"

vim-plug

Plug 'wynlang/nvim-wyn'

Manual

cp -r syntax ftdetect ftplugin ~/.config/nvim/

LSP

Add to your init.lua:

-- Using nvim-lspconfig
local lspconfig = require('lspconfig')
local configs = require('lspconfig.configs')

if not configs.wyn then
  configs.wyn = {
    default_config = {
      cmd = {'wyn', 'lsp'},
      filetypes = {'wyn'},
      root_dir = lspconfig.util.root_pattern('wyn.toml', '.git'),
    },
  }
end

lspconfig.wyn.setup{}

Or without lspconfig:

vim.api.nvim_create_autocmd("FileType", {
  pattern = "wyn",
  callback = function()
    vim.lsp.start({
      name = "wyn",
      cmd = {"wyn", "lsp"},
      root_dir = vim.fs.dirname(vim.fs.find({"wyn.toml", ".git"}, {upward = true})[1]),
    })
  end,
})

Make sure wyn is in your PATH (wyn install).

LSP provides:

• Completions — all keywords, 27 modules with method hints, triggered by .
• Hover — type information
• Go to Definition — jump to function/struct definitions
• Find References — find all usages
• Rename — rename symbols across files
• Format — format document

Keymaps

Suggested additions to your config:

vim.api.nvim_create_autocmd("FileType", {
  pattern = "wyn",
  callback = function()
    vim.keymap.set("n", "<F5>", ":!wyn run %<CR>", {buffer = true})
    vim.keymap.set("n", "<F6>", ":!wyn check %<CR>", {buffer = true})
  end,
})

Highlighted

Category	Tokens
Keywords	fn var const struct enum impl trait type pub import export module
Flow	return break continue spawn await if else match while for in
Modifiers	mut
Types	int float string bool void ResultInt OptionInt
Modules	File System Terminal HashMap Math Path DateTime Json Regex Csv Http Net Db Task Gui Audio StringBuilder Crypto Encoding Os Uuid Log Process Test Url
Constants	true false None Some Ok Err

Example

struct Vec2 {
    x: int
    y: int

    fn mag_sq(self) -> int {
        return self.x * self.x + self.y * self.y
    }
}

fn main() -> int {
    var v = Vec2{x: 3, y: 4}
    var squares = [i * i for i in 0..10]
    println(v.mag_sq().to_string())
    return 0
}

Links

• Wyn Language
• Documentation
• wynlang.com