Allow 'cwd' option on repl_definition? Potential PR

[damca]

It could be nice to allow a repl_definition to also have a 'cwd' function:

typescript = {
  command = { "ts-node" },
  cwd = function(current_bufnr)
    local filename = vim.api.nvim_buf_get_name(current_bufnr)
    local root = require("lspconfig.util").root_pattern("node_modules", "package.json", "tsconfig.json", ".git")(filename)
    return root
  end,
  open = ".editor\n",
  close = "\04"
},

I was able to get this to work by adding the following to the lowlevel.create_repl_on_current_window function:

if type(repl.cwd) == 'string' then
  opts.cwd = repl.cwd
elseif type(repl.cwd) == 'function' then
  opts.cwd = repl.cwd(current_bufnr)
end

[hkupty]

That's a wonderful suggestion. I'll look into it when I have time. :)