mod class;
mod dependency;
mod error;
//mod lock;
mod meta;
mod nest;
mod package;
pub mod prelude;
mod prey;
mod workspace;

pub use error::{Error, Result};

use std::io;
use std::path::PathBuf;

pub const FN_NEST: &str = "Nest";
pub const FN_PREY: &str = "Prey";

pub const F_NEST_TOML: &str = const_format::concatcp!(FN_NEST, fs::EXT_TOML);
pub const F_NEST_LOCK: &str = const_format::concatcp!(FN_NEST, fs::EXT_LOCK);
pub const F_PREY_TOML: &str = const_format::concatcp!(FN_PREY, fs::EXT_TOML);
pub const F_PREY_LOCK: &str = const_format::concatcp!(FN_PREY, fs::EXT_LOCK);

/// Return the location of the parent `Nest.toml` as [`PathBuf`]
///
/// # Errors
///
/// Possible cases:
///
/// * `Nest.toml` cannot be located.
/// * Current working directory does not exist.
/// * There are insufficient permissions to access the current directory.
pub fn locate_nest() -> io::Result<PathBuf> {
    let cwd = std::env::current_dir()?;
    let mut probe = cwd.clone();

    while !probe.join(F_NEST_TOML).exists() {
        if !probe.pop() {
            return Err(io::ErrorKind::NotFound.into());
        }
    }

    Ok(probe)
}