Function svn_opt_format_option 

pub unsafe extern "C" fn svn_opt_format_option(
    string: *mut *const c_char,
    opt: *const apr_getopt_option_t,
    doc: svn_boolean_t,
    pool: *mut apr_pool_t,
)

Print an option @a opt nicely into a @a string allocated in @a pool. If @a doc is set, include the generic documentation string of @a opt, localized to the current locale if a translation is available.