lich 0.2.0

Minimal password management.
Documentation 
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use clap;
use common::*;
use entry;
use lich::Error::Decrypt;
use std::fs::OpenOptions;
use std::path::PathBuf;

pub fn run(path: PathBuf) -> Result<(), clap::Error> {
    let mut file = OpenOptions::new()
        .read(true)
        .write(true)
        .open(&path)
        .map_err(|e| read_error(&path, e))?;

    let mut data = decode(&file, &path)?;

    loop {
        let (old, new) = entry::change_password();
        match data.change_password(&old, &new) {
            Ok(()) => break,
            Err(e) =>
                match e {
                    Decrypt => wlnerr!("Incorrect password; try again."),
                    e => return Err(read_error(&path, e))
                }
        }
    }

    save(&mut file, &path, &data)?;
    println!("Updated the master password!");
    Ok(())
}