nix-shell VSCode Golang

shell.nix

{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell rec {
  packages = with pkgs; [ delve go gopls go-outline go-tools libkrb5.dev ];

  WORKSPACE_ROOT = toString ./.;
 
  # VSCode's Go plugin doesn't play well with nix shells, so we create a custom directory for all our tools and tell the plugin to use it.
  shellHook = ''
    initNixShell() {
      echo Initializing Nix shell
      mkdir -p "$WORKSPACE_ROOT/.nix"
      ln --symbolic --force ${pkgs.symlinkJoin { name = "go-tools"; paths = map (x: "${x}/bin") packages; }}/* "$WORKSPACE_ROOT/.nix"
      local settings_file="$WORKSPACE_ROOT/.vscode/settings.json"
      if [ -f "$settings_file" ]; then
        echo Setting .nix as gopath in VSCode settings
        local new_json
        new_json=$(${pkgs.jq}/bin/jq '."go.toolsGopath" = $gopath' --arg gopath ''\'''${workspaceRoot}/.nix' < "$settings_file") && echo "$new_json" > "$settings_file"
      fi
    }
    initNixShell
  '';
}