fix(julials): invalid path arg given to activate_env #4340

The argument to `activate_env` is a table, one entry of which is
the name of the environment to activate if it is provided, or an
empty string if it is not provided.

closes #4335

Author: dpo

lsp/julials.lua

@@ -20,12 +20,17 @@
 --- julia --project=/path/to/my/project -e 'using Pkg; Pkg.instantiate()'
 --- ```
 ---
+--- To activate a Julia environment, use the `:LspJuliaActivateEnv` command. A prompt will ask you to select a Julia
+--- environment from the list of environments found in the current working directory and the `environments/` folder of
+--- `$JULIA_DEPOT_PATH` entries. You can also provide a path to a Julia environment directly.
+--- Example: `:LspJuliaActivateEnv /path/to/my/project`.
+---
 --- Note: The julia programming language searches for global environments within the `environments/`
 --- folder of `$JULIA_DEPOT_PATH` entries. By default this simply `~/.julia/environments`
 
 local root_files = { 'Project.toml', 'JuliaProject.toml' }
 
-local function activate_env(path)
+local function activate_env(args)
   assert(vim.fn.has 'nvim-0.10' == 1, 'requires Nvim 0.10 or newer')
   local bufnr = vim.api.nvim_get_current_buf()
   local julials_clients = vim.lsp.get_clients { bufnr = bufnr, name = 'julials' }
@@ -42,7 +47,8 @@ local function activate_env(path)
       vim.notify('Julia environment activated: \n`' .. environment .. '`', vim.log.levels.INFO)
     end
   end
-  if path then
+  local path = args.args
+  if path ~= nil and #path > 0 then
     path = vim.fs.normalize(vim.fn.fnamemodify(vim.fn.expand(path), ':p'))
     local found_env = false
     for _, project_file in ipairs(root_files) do