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#![deny(missing_docs)]
#![cfg_attr(test, deny(warnings))]
#![feature(external_doc)]
#![doc(include = "../README.md")]
#![cfg_attr(test, feature(plugin))]
#![cfg_attr(test, plugin(clippy))]

extern crate failure;

use failure::Error;
use std::fmt::Write;

/// Pretty hash representation.
#[derive(Debug)]
pub struct PrettyHash {}

impl PrettyHash {
  /// Create a new pretty formatted string from a vec slice.
  pub fn fmt(input: &[u8]) -> Result<String, Error> {
    let mut string = String::new();

    for &byte in input {
      write!(&mut string, "{:X}", byte)?;
    }

    if string.len() > 8 {
      let (head, tail) = string.split_at(6);
      let cut_off = tail.len() - 2;
      let (_, tail) = tail.split_at(cut_off);
      Ok(format!("{}..{}", head, tail))
    } else {
      Ok(string)
    }
  }
}