starter/lua/mj/alternate_file.lua

local runner = require("mj.command_runner")
M = {}

M._mj_alternative_file = function(file, subcommand, options)
  local cmd = "mj alternative_file " .. subcommand .. " " .. file .. " " .. options
  return runner.run(cmd)
end

M.open = function(subcommand, options)
  local file_path = vim.fn.expand("%")
  file_path = vim.fn.fnamemodify(file_path, ":~:.")
  local files = M._mj_alternative_file(file_path, subcommand, options)
  files = vim.split(files, " ")
  local file = files[1]

  if file ~= "" then
    vim.api.nvim_command("e " .. file)
  end
end

return M