# hiopt 

`getopt/getopt_long for rust`. 

提供类似libc::getopt的功能.
1. 单ascii字符的选项: `-a -b` 或者 `-ab`, `-c value` 或者 `-cvalue`
2. 长字符串选项: `--long=value` 或者 `--long value`
3. 选项结束标志: `--`
4. 不限制非选项的输入顺序: `-c value arg` 或者 `arg -c value`

分别提供遍历选项和非选项的函数接口.

## Example
```rust
use hiopt::{options, OptErr};
let opts = options!["a", "b:", "long:"]; // ':' means the option requires an argument. 表示选项需要输入参数
let args = ["program", "-acbb-arg", "--long=long-arg", "--abc", "arg", "-b", "--", "-abc", "--long"];
let mut iter = opts.opt_iter(&args); 
assert_eq!(iter.next(), Some(Ok((0, None)))); // opts[0].name = "a"
assert_eq!(iter.next(), Some(Err(OptErr::NoShortOpt(b'c'))));
assert_eq!(iter.next(), Some(Ok((1, Some("b-arg"))))); // opts[1].name = "b"
assert_eq!(iter.next(), Some(Ok((2, Some("long-arg"))))); // opts[2].name = "long"
assert_eq!(iter.next(), Some(Err(OptErr::NoLongOpt("abc"))));
assert_eq!(iter.next(), Some(Err(OptErr::NoArg(1)))); // opts[1].name = "b"
assert_eq!(iter.next(), None);

let mut iter = opts.noopt_iter(&args);
assert_eq!(iter.next(), Some("program"));
assert_eq!(iter.next(), Some("arg"));
assert_eq!(iter.next(), Some("--"));
assert_eq!(iter.next(), Some("-abc"));
assert_eq!(iter.next(), Some("--long"));
assert_eq!(iter.next(), None);
```

可以结合hictor crate获取应用程序的命令行输入进行分析处理

## Example
```rust
let opts = hiopt::options!["a", "b:"];
let args = unsafe { hiopt::raw_args_from_i8(hictor::args()) };
for opt in opts.opt_iter(args) {
    println!("opt = {opt:?}");
}

for arg in opts.noopt_iter(args) {
    println!("arg = {arg:?}");
}
```

0.1.4版本区分了options!和args数组引用和数组元素的引用，这样可以将命令行输入参数(`'static`)保存下来.
0.1.5版本区分了options!和args元素的引用，options!元素的生命周期可能比args元素生命周期更短.

## Example
```rust
fn get_input() -> &'static str {
    let opts = hiopt::options!["i:", "input:"];
    let args = unsafe { hiopt::raw_args_from_i8(hictor::args()) };
    for opt in opts.opt_iter(args) {
        let (idx, arg) = opt.unwrap();
        match idx {
            0..=1 => return arg.unwrap(),
            _ => unreachable!(),
        }
    }
    ""
}
```