//!use std::{    cell::Ref,    ops::{Deref, DerefMut},    path::Path,}; use git_odb::Find;use git_ref::file::ReferenceExt; use crate::easy; /// A platform to create iterators over references.#[must_use = "Iterators should be obtained from this iterator platform"]pub struct Platform<'r, A>where    A: easy::Access + Sized,{    pub(crate) repo: A::RepoRef,    pub(crate) packed_refs: Ref<'r, easy::reference::packed::ModifieablePackedRefsBuffer>,    pub(crate) access: &'r A,} /// An iterator over references, with or without filter.pub struct Iter<'r, A> {    inner: git_ref::file::iter::LooseThenPacked<'r, 'r>,    packed_refs: Option<&'r git_ref::packed::Buffer>,    peel: bool,    access: &'r A,} impl<'r, A> Platform<'r, A>where    A: easy::Access + Sized,{    /// Return an iterator over all references in the repository.    ///    /// Even broken or otherwise unparsible or inaccessible references are returned and have to be handled by the caller on a    /// case by case basis.    pub fn all(&self) -> Result<Iter<'_, A>, init::Error> {        let repo = self.repo.deref();        Ok(Iter {            inner: repo.refs.iter(self.packed_refs.buffer.as_ref())?,            packed_refs: self.packed_refs.buffer.as_ref(),            peel: false,            access: self.access,        })    }     /// Return an iterator over all references that match the given `prefix`.    ///    /// These are of the form `refs/heads` or `refs/remotes/origin`, and must not contain relative paths components like `.` or `..`.    pub fn prefixed(&self, prefix: impl AsRef<Path>) -> Result<Iter<'_, A>, init::Error> {        let repo = self.repo.deref();        Ok(Iter {            inner: repo.refs.iter_prefixed(self.packed_refs.buffer.as_ref(), prefix)?,            packed_refs: self.packed_refs.buffer.as_ref(),            peel: false,            access: self.access,        })    }} impl<'r, A> Iter<'r, A> {    /// Automatically peel references before yielding them during iteration.    ///    /// This has the same effect as using `iter.map(|r| {r.peel_to_id_in_place(); r})`.    ///    /// # Note    ///    /// Doing this is necessary as the packed-refs buffer is already held by the iterator, disallowing the consumer of the iterator    /// to peel the returned references themselves.    pub fn peeled(mut self) -> Self {        self.peel = true;        self    }} impl<'r, A> Iterator for Iter<'r, A>where    A: easy::Access + Sized,{    type Item = Result<easy::Reference<'r, A>, Box<dyn std::error::Error + Send + Sync + 'static>>;     fn next(&mut self) -> Option<Self::Item> {        self.inner.next().map(|res| {            res.map_err(|err| Box::new(err) as Box<dyn std::error::Error + Send + Sync + 'static>)                .and_then(|mut r| {                    if self.peel {                        let repo = self.access.repo()?;                        let state = self.access.state();                        let mut pack_cache = state.try_borrow_mut_pack_cache()?;                        r.peel_to_id_in_place(&repo.refs, self.packed_refs, |oid, buf| {                            repo.odb                                .try_find(oid, buf, pack_cache.deref_mut())                                .map(|po| po.map(|o| (o.kind, o.data)))                        })                        .map_err(|err| Box::new(err) as Box<dyn std::error::Error + Send + Sync + 'static>)                        .map(|_| r)                    } else {                        Ok(r)                    }                })                .map(|r| easy::Reference::from_ref(r, self.access))        })    }} ///pub mod init {    /// The error returned by [`Platform::all()`][super::Platform::all()] or [`Platform::prefixed()`][super::Platform::prefixed()].    #[derive(Debug, thiserror::Error)]    #[allow(missing_docs)]    pub enum Error {        #[error(transparent)]        Io(#[from] std::io::Error),    }} ///mod error {    use crate::easy;     /// The error returned by [ReferenceAccessExt::references()][easy::ext::ReferenceAccessExt::references()].    #[derive(Debug, thiserror::Error)]    #[allow(missing_docs)]    pub enum Error {        #[error(transparent)]        PackedRefsOpen(#[from] git_ref::packed::buffer::open::Error),        #[error("BUG: Part of interior state could not be borrowed.")]        BorrowState(#[from] easy::borrow::state::Error),        #[error("BUG: The repository could not be borrowed")]        BorrowRepo(#[from] easy::borrow::repo::Error),    }     impl From<easy::reference::packed::Error> for Error {        fn from(err: easy::reference::packed::Error) -> Self {            match err {                easy::reference::packed::Error::PackedRefsOpen(err) => Error::PackedRefsOpen(err),                easy::reference::packed::Error::BorrowState(err) => Error::BorrowState(err),            }        }    }}pub use error::Error;