Dynamic working directory based off of current file

[Ray Zane]

I've configured Rspec like this (which should probably be the default):

require('nvim-test.runners.rspec'):setup({
  command = "bundle",
  args = { "exec", "rspec" },
})

This works perfectly when I open neovim in the directory containing the Gemfile. However, this doesn't work when I'm working on a project with multiple roots:

project/
  a/
    Gemfile
    spec/a_spec.rb
  b/
    Gemfile
    spec/b_spec.rb

If I'm editing a_spec.rb, I'd want to execute bundle exec spec/a_spec.rb with { cwd = "a" }.

I propose the introduction of runner:find_working_directory(filename) to dynamically infer the working directory. In the case of RSpec, that implementation might look something like this (adapted from here):

function rspec:find_working_directory(filename)
  local gemfile = vim.fn.findfile("Gemfile", vim.fn.fnamemodify(filename, ":p") .. ";")
  return vim.fn.fnamemodify(gemfile, ":p:h:t")
end