#[macro_export]
macro_rules! unic_arg_enum {
(@as_item $($i:item)*) => ($($i)*);
(@impls ( $($tts:tt)* ) -> ($e:ident, $($v:ident),+)) => {
unic_arg_enum!(@as_item
$($tts)*
impl ::std::str::FromStr for $e {
type Err = String;
fn from_str(s: &str) -> ::std::result::Result<Self,Self::Err> {
match s {
$(stringify!($v) |
_ if s.replace("-", "").eq_ignore_ascii_case(stringify!($v)) => Ok($e::$v)),+,
_ => Err({
let v = vec![
$(stringify!($v),)+
];
format!("valid values: {}",
v.join(" ,"))
}),
}
}
}
impl ::std::fmt::Display for $e {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
match *self {
$($e::$v => write!(f, stringify!($v)),)+
}
}
}
impl $e {
#[allow(dead_code)]
pub fn variants() -> [&'static str; _clap_count_exprs!($(stringify!($v)),+)] {
[
$(stringify!($v),)+
]
}
});
};
($(#[$($m:meta),+])+ pub enum $e:ident { $($v:ident $(=$val:expr)*),+ } ) => {
unic_arg_enum!(@impls
($(#[$($m),+])+
pub enum $e {
$($v$(=$val)*),+
}) -> ($e, $($v),+)
);
};
($(#[$($m:meta),+])+ enum $e:ident { $($v:ident $(=$val:expr)*),+ } ) => {
unic_arg_enum!(@impls
($(#[$($m),+])+
enum $e {
$($v$(=$val)*),+
}) -> ($e, $($v),+)
);
};
(pub enum $e:ident { $($v:ident $(=$val:expr)*),+ } ) => {
unic_arg_enum!(@impls
(pub enum $e {
$($v$(=$val)*),+
}) -> ($e, $($v),+)
);
};
(enum $e:ident { $($v:ident $(=$val:expr)*),+ } ) => {
unic_arg_enum!(@impls
(enum $e {
$($v$(=$val)*),+
}) -> ($e, $($v),+)
);
};
}