-------------------------------------------------------------------------------
-- Utilities shared by all modules. Categorize better if > 5 public functions
-------------------------------------------------------------------------------
local Util = {}
-------------------------------------------------------------------------------
-- Internal Functions
-------------------------------------------------------------------------------
local fs = vim.loop

local function create_directory(directory)
  local stat = fs.fs_stat(directory)
  if stat then
    if stat.type == 'directory' then
      return
    else
      error('Expected directory but found file at: ' .. directory)
    end
  else
    local parent = directory:match('(.+)/[^/]*$')
    if parent then
      create_directory(parent)
    end
    local success, error = fs.fs_mkdir(directory, 493)
    if not success then
      error('Could not directory at: ' .. directory .. '. ' .. error)
    end
  end
end
-------------------------------------------------------------------------------
-- Public Interface
-------------------------------------------------------------------------------
function Util.ensure_directory_exists(path)
  local full_path = vim.fn.expand(path)
  create_directory(path)
end

function Util.join(...)
  local separator = '/'
  local paths = {...}
  return table.concat(paths, separator):gsub(separator..'+', separator)
end

function Util.directory_name(file_path)
  local pattern = '(.+)/[^/]+$'
  return file_path:match(pattern)
end

return Util