Re: [PATCH] checkout: add --progress option

> Under normal circumstances, and like other git commands,
> git checkout will write progress info to stderr if
> attached to a terminal. This option allows progress
> to be forced even if not using a terminal. Also,
> progress can be skipped if using option --no-progress.
>
> Signed-off-by: Edmundo Carmona Antoranz <eantoranz@gmail.com>
> ---
> -       opts.verbose_update = !o->quiet && isatty(2);
> +       /**
> +        * Rules to display progress:
> +        * -q is selected
> +        *      no verbiage
> +        * -q is _not_ selected and --no-progress _is_ selected,
> +        *      progress will be skipped
> +        * -q is _not_ selected and --progress _is_ selected,
> +        *      progress will be printed to stderr
> +        * -q is _not_ selected and --progress is 'undefined'
> +        *      progress will be printed to stderr _if_ working on a terminal
> +        */
> +       opts.verbose_update = !o->quiet && (option_progress > 0 ||
> +                                          (option_progress < 0 && isatty(2)));