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im(arg_enum): allows ascii case insensitivity for enum variants

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Allows creating an enum with CamelCase to follow Rust guidelines, but
then will match ascii case insensitive. This means variant
SomeEnum::Emacs would match string "emacs".

Closes #104
This commit is contained in:
Kevin K 2015-05-05 12:33:02 -04:00
parent 632c89bf26
commit b249f9657c
1 changed files with 8 additions and 4 deletions
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12
src/macros.rs
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@ -227,7 +227,7 @@ macro_rules! value_t_or_exit {
match v.parse::<$t>() {
Ok(val) => val,
Err(e) => {
println!("{} isn't a valid {}\n{}\n{}\nPlease re-run with --help for \
println!("{} isn't a valid {}\n\t{}\n{}\nPlease re-run with --help for \
more information",
v,
stringify!($t),
@ -254,7 +254,7 @@ macro_rules! value_t_or_exit {
match pv.parse::<$t>() {
Ok(rv) => tmp.push(rv),
Err(_) => {
println!("{} isn't a valid {}\n{}\nPlease re-run with --help for more \
println!("{} isn't a valid {}\n\t{}\nPlease re-run with --help for more \
information",
pv,
stringify!($t),
@ -330,6 +330,8 @@ macro_rules! simple_enum {
/// Convenience macro to generate more complete enums with variants to be used as a type when
/// parsing arguments.
///
/// **NOTE:** Case insensitivity is supported for ASCII characters
///
/// These enums support pub (or not) and use of the #[derive()] traits
///
///
@ -369,13 +371,15 @@ macro_rules! arg_enum {
type Err = String;
fn from_str(s: &str) -> Result<Self,Self::Err> {
use ::std::ascii::AsciiExt;
match s {
$(stringify!($v) => Ok($e::$v),)+
$(stringify!($v) |
_ if s.eq_ignore_ascii_case(stringify!($v)) => Ok($e::$v),)+
_ => Err({
let v = vec![
$(stringify!($v),)+
];
format!("valid:{}",
format!("valid values:{}",
v.iter().fold(String::new(), |a, i| {
a + &format!(" {}", i)[..]
}))