Re: [GSoC PATCH v2 1/2] repo: add the flag -z as an alias for --format=nul

> Putting the devil's advocate hat on, "--format=<plain,nul>" was an
> attempt to avoid needless proliferation of options (e.g. presense of
> "-z" would tempt people into add "--json" when they introduce
> "--format=json"), so it may not be unconditionally a good idea to
> mimic these older commands where there are only two output formats.

> You'd probably need to define a parseopt callback function for
> "format" and "-z", and remember the one that you saw the last.  So
> giving "-z --format=nul --format=text" would first set an internal
> "format" to FORMAT_NUL_TERMINATED (due to "-z"), and then to the
> same FORMAT_NUL_TERMINATED again (due to "--format=nul"), and then
> finally to FORMAT_TEXT (due to "--format=text"), or something like
> that, which would give the familiar "the last one wins" semantics.