extargsparse_codegen 0.1.4

Rust Commandline User Interface
Documentation 
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use std::env;


fn _get_environ_var(envname :&str) -> String {
	match env::var(envname) {
		Ok(v) => {
			format!("{}",v)
		},
		Err(_e) => {
			String::from("")
		}
	}
}


macro_rules! extargs_error_class {
	($type:ident) => {
	#[derive(Debug,Clone)]
	struct $type {
		msg :String,		
	}

	impl $type {
		fn create(c :&str) -> $type {
			$type {msg : format!("{}",c)}
		}
	}

	impl fmt::Display for $type {
		fn fmt(&self,f :&mut fmt::Formatter) -> fmt::Result {
			write!(f,"{}",self.msg)
		}
	}

	impl Error for $type {}
	};
}

macro_rules! extargs_new_error {
	($type:ty,$($a:expr),*) => {
		{
		let mut c :String= format!("[{}:{}][{}]",file!(),line!(),stringify!($type));
		c.push_str(&(format!($($a),*)[..]));
		return Err(Box::new(<$type>::create(c.as_str())));
	  }
	};
}