Re: [PATCH v5] 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>
> ---
> +       /*
> +        * Final processing of show_progress
> +        * - User selected --progress: show progress
> +        * - user selected --no-progress: skip progress
> +        * - User didn't specify:
> +        *     (check rules in order till finding the first matching one)
> +        *     - user selected --quiet: skip progress
> +        *     - stderr is connected to a terminal: show progress
> +        *     - fallback: skip progress
> +        */
> +       if (opts.show_progress < 0) {
> +               /* user didn't specify --[no-]progress */
> +               if (opts.quiet)
> +                       opts.show_progress = 0;
> +               else
> +                       opts.show_progress = isatty(2);
> +       }