use crate::Bundle;use std::{    convert::TryFrom,    path::{Path, PathBuf},}; /// Returned by [`Bundle::at()`]#[derive(thiserror::Error, Debug)]#[allow(missing_docs)]pub enum Error {    #[error("An 'idx' extension is expected of an index file: '{0}'")]    InvalidPath(PathBuf),    #[error(transparent)]    Pack(#[from] crate::data::header::decode::Error),    #[error(transparent)]    Index(#[from] crate::index::init::Error),} /// Initializationimpl Bundle {    /// Create a `Bundle` from `path`, which is either a pack file _(*.pack)_ or an index file _(*.idx)_.    ///    /// The corresponding complementary file is expected to be present.    /// Also available via [`Bundle::try_from()`].    pub fn at(path: impl AsRef<Path>) -> Result<Self, Error> {        Self::try_from(path.as_ref())    }} impl TryFrom<&Path> for Bundle {    type Error = Error;     fn try_from(path: &Path) -> Result<Self, Self::Error> {        let ext = path            .extension()            .and_then(|e| e.to_str())            .ok_or_else(|| Error::InvalidPath(path.to_owned()))?;        Ok(match ext {            "idx" => Self {                index: crate::index::File::at(path)?,                pack: crate::data::File::at(path.with_extension("pack"))?,            },            "pack" => Self {                pack: crate::data::File::at(path)?,                index: crate::index::File::at(path.with_extension("idx"))?,            },            _ => return Err(Error::InvalidPath(path.to_owned())),        })    }}