TinyGo.nvim

This NeoVim plugin lets you configure Go's environment variables so that Go's LSP server (i.e. gopls) offers accurate completions and suggestions. A sane and working TinyGo installation is of course a prerequisite for the plugin to work!

Under the hood it basically parses the output of go env, tinygo targets and tinygo target ... to then restart the attached gopls instance with the appropriate environment variables. As of now, it relies on nvim-lspconfig to restart the attached gopls instance, but it can also be made to cooperate with the stock Nvim LSP API documented here.

The plugin is loosely based on a preexisting one written in Vim Script: sago35/tinygo.vim. Thanks a lot for the guidance!

The initial (and authoritative) source of information on what needs to be configured for TinyGo's correct integration with gopls can be found here.

Aside from that, in writing this (our very first) plugin we found the following sites and documentation to be extremely helpful:

Neovim: Plugins to get started: Great discussion on the anatomy of Neovim plugins and how they are structured.
Unofficial Neovim Lua Guide: A great primer on using Lua within Neovim.
Linode Neovim Tutorial: Despite the website being very choppy (at least on Safari) and throwing some Vim Script in the mix, this tutorial presents a nice overall structure of what a Neovim plugin looks like.
Lua 5.1 Reference: For everything Lua, nothing beats the official reference.
Neovim LSP documentation: The official documentation on Neovim and its LSP implementation sheds a lot of light on what makes LSPs tick. However, this is mostly abstracted away in our case by nvim-lspconfig.
Neovim builtin documentation: The official documentation on builtin functions we can invoke through vim.fn from Lua. Things like json_decode proved to be extremely useful.
Neovim Lua documentation: The official documentation on Lua within Neovim helps one come to terms with how everything is structured as well as the goodies (i.e. standard library, APIs and such) one can rely on.
Official Neovim Lua Guide: Pretty much like its unofficial counterpart, this guide offers a more hands-on experience on how to leverage Lua in the context of Neovim.
Lspconfig documentation: This documentation (accessible through :h lspconfig within Neovim) offers some insights into how LSP servers are configured. For instance, it explains how lspconfig.gopls.setup actually restarts the LSP instance attached to a buffer, which made our life that much easier!

Note this repository 'lives' locally on our development machine over at:

~/.local/share/nvim/site/pack/packer/start/tinygo.nvim

That's because it's been installed with packer.nvim and that's where stuff goes...

Dependencies

As previously stated, this plugin relies on nvim-lspconfig to manage the attached LSP instance. However, this plugin can instead resort to 'pure' API calls if this were to prove an obstacle. Given the pervasiveness of nvim-lspconfig that is unlikely to happen, but it is nice to know we can count on some wiggle room!

Installation

This plugin can be installed through regular plugin manages. I use packer.nvim, so it's the example we'll provide. The rest should be rather similar: this plugin requires no settings!

use {
    "pcolladosoto/tinygo.nvim",
    config = function() require("tinygo").setup() end
}

Usage

This plugin provides three different user commands:

:TinyGoSetTarget <target-name>: This command configures the target name passed as a parameter. TABbing will display a list with available targets, including original. This special target will leave the Go environment as it was before configuring any other target.
:TinyGoTargets: This command will simply list available TinyGo targets, excluding original.
:TinyGoEnv: This commmand prints the currently configured target, GOROOT and GOFLAGS.

I hope you find this useful!