xflags

Moderately simple command line arguments parsing:

```rust mod flags { use std::path::PathBuf;

xflags::xflags! {
    src "./examples/basic.rs"

    cmd my-command
        required path: PathBuf
    {
        optional -v, --verbose
    }
}

// generated start
// The following code is generated by `xflags` macro.
// Run `env UPDATE_XFLAGS=1 cargo build` to regenerate.
#[derive(Debug)]
pub struct MyCommand {
    pub path: PathBuf,

    pub verbose: bool,
}

impl MyCommand {
    pub const HELP: &'static str = Self::HELP_;

    pub fn from_env() -> xflags::Result<Self> {
        Self::from_env_()
    }

    pub fn from_vec(args: Vec<std::ffi::OsString>) -> xflags::Result<Self> {
        Self::from_vec_(args)
    }
}
// generated end

}

fn main() { let flags = flags::MyCommand::from_env(); println!("{:#?}", flags); } ```