coreutiles 0.1.0

Core utils in Rust
Documentation 
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use std::borrow::Cow;
use std::io;

pub mod grep;
pub mod cat;
pub mod netcat;

pub type Result<T> = std::result::Result<T,Error>;

pub struct Error {
    exit_code: i32,
    msg: Cow<'static, str>,
}

impl Error {
    pub fn new(msg: impl Into<Cow<'static,str>>) -> Self {
        Self {
            exit_code: 1,
            msg: msg.into()
        }
    }
    pub fn with_exit_code(mut self, code: i32) -> Self {
        self.exit_code = code;
        self
    }
    pub fn msg(&self) -> &str {
        &self.msg
    }
    pub fn exit_code(&self) -> i32 {
        self.exit_code
    }
}

impl From<io::Error> for Error {
    fn from(value: io::Error) -> Self {
        Self::new(value.to_string())
    }
}

impl From<&'static str> for Error {
    fn from(value: &'static str) -> Self {
        Self::new(value)
    }
}

#[macro_export]
macro_rules! coreutil {
    ($p:ident) => {
        pub fn main() {
            if let Err(err) = $crate :: $p :: run () {
                eprintln!("{}", err.msg());
                std::process::exit(err.exit_code());
            }
        }
    };
}