Re: [PATCH 1/3] checkout.c: add strict usage of -- before file_path

> Currently, <checkout> is a complex command able to handle both
> branches and files without any distintion other than their names,
> taking into account that depending on the type (branch or file),
> the functionality is completely different, the easier example:
> 
> $ git checkout <branch>  # Switch from current branch to <branch>.
> $ git checkout <file>    # Restore <file> from HEAD, discarding
>                          # changes if it's necessary.
> $ git checkout -- <file> # The same as the last one, only with an
>                          # useless '--'.
> 
> For GIT new users, this complicated versatility of <checkout> could
> be very confused, also considering that actually the flag '--' is
> completely useless (added or not, there is not any difference for
> this command), when the same program messages promote the use of
> this flag.
> 
> Regarding the <checkout>'s power to overwrite any file, discarding
> changes if they exist without some way of recovering them, the
> solution propuses that the usage of '--' is strict before to
> specify the file(s) path(s) for any <checkout> command (including
> all types of flags), as a "defense barrier" to make sure about
> user's knowledge and intension running <checkout>.
> 
> The solution consists in detect '--' into command args, allowing
> the discard of changes and considering the following names as
> file paths, otherwise, they are branch names.
> 
> Signed-off-by: Dannier Castro L <danniercl@gmail.com>