Helper function to use consistent output. Uses `stdout` to ensure the output is greppable, or redirectable to file (separate from API/system errors).

Normalize a path by removing /./ or // from it.

Returns a OptionalFileEntryRef for any non-empty path.

Append the path of a record inside of an index

Returns a FileEntry for any non-empty path.

Stores a copy of `moduleName` and returns a handle.

Returns None if the Unit file is already up to date

Returns true if the Unit file of given output file already exists and is older than the input file.

Implementation of ModuleInfoWriterCallback, which is an unusual API. When adding dependencies to Units, the module name is passed not as a string, but