use std::cmp::Ordering; use crate::{    bstr::{BStr, BString},    tree,}; mod ref_iter;///pub mod write; /// The mode of items storable in a tree, similar to the file mode on a unix file system.////// Used in [mutable::Entry][crate::tree::Entry] and [EntryRef].#[derive(Clone, Copy, PartialEq, Eq, Debug, Ord, PartialOrd, Hash)]#[repr(u16)]#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]pub enum EntryMode {    /// A tree, or directory    Tree = 0o040000u16,    /// A file that is not executable    Blob = 0o100644,    /// A file that is executable    BlobExecutable = 0o100755,    /// A symbolic link    Link = 0o120000,    /// A commit of a git submodule    Commit = 0o160000,} impl EntryMode {    /// Return true if this entry mode represents a Tree/directory    pub fn is_tree(&self) -> bool {        *self == EntryMode::Tree    }     /// Return true if this entry mode represents anything BUT Tree/directory    pub fn is_no_tree(&self) -> bool {        *self != EntryMode::Tree    }} /// An element of a [`TreeRef`][crate::TreeRef::entries].#[derive(PartialEq, Eq, Debug, Hash, Clone)]#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]pub struct EntryRef<'a> {    /// The kind of object to which `oid` is pointing.    pub mode: tree::EntryMode,    /// The name of the file in the parent tree.    pub filename: &'a BStr,    /// The id of the object representing the entry.    // TODO: figure out how these should be called. id or oid? It's inconsistent around the codebase.    // Answer: make it 'id', as in `git2`    #[cfg_attr(feature = "serde1", serde(borrow))]    pub oid: &'a git_hash::oid,} impl<'a> PartialOrd for EntryRef<'a> {    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {        Some(self.cmp(other))    }} impl<'a> Ord for EntryRef<'a> {    /// Entries compare by the common portion of the filename. This is critical for proper functioning of algorithms working on trees.    fn cmp(&self, other: &Self) -> Ordering {        let len = self.filename.len().min(other.filename.len());        self.filename[..len].cmp(&other.filename[..len])    }} /// An entry in a [`Tree`][crate::Tree], similar to an entry in a directory.#[derive(PartialEq, Eq, Debug, Hash, Clone)]#[cfg_attr(feature = "serde1", derive(serde::Serialize, serde::Deserialize))]pub struct Entry {    /// The kind of object to which `oid` is pointing to.    pub mode: EntryMode,    /// The name of the file in the parent tree.    pub filename: BString,    /// The id of the object representing the entry.    pub oid: git_hash::ObjectId,} impl PartialOrd for Entry {    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {        Some(self.cmp(other))    }} impl Ord for Entry {    /// Entries compare by the common portion of the filename. This is critical for proper functioning of algorithms working on trees.    fn cmp(&self, other: &Self) -> Ordering {        let len = self.filename.len().min(other.filename.len());        self.filename[..len].cmp(&other.filename[..len])    }} /// Serializationimpl EntryMode {    /// Return the representation as used in the git internal format.    pub fn as_bytes(&self) -> &'static [u8] {        use EntryMode::*;        match self {            Tree => b"40000",            Blob => b"100644",            BlobExecutable => b"100755",            Link => b"120000",            Commit => b"160000",        }    }}