gix_object/tree/mod.rs
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280
use crate::{
bstr::{BStr, BString},
tree, Tree, TreeRef,
};
use std::cell::RefCell;
use std::cmp::Ordering;
///
pub mod editor;
mod ref_iter;
///
pub mod write;
/// The state needed to apply edits instantly to in-memory trees.
///
/// It's made so that each tree is looked at in the object database at most once, and held in memory for
/// all edits until everything is flushed to write all changed trees.
///
/// The editor is optimized to edit existing trees, but can deal with building entirely new trees as well
/// with some penalties.
#[doc(alias = "TreeUpdateBuilder", alias = "git2")]
#[derive(Clone)]
pub struct Editor<'a> {
/// A way to lookup trees.
find: &'a dyn crate::FindExt,
/// The kind of hashes to produce
object_hash: gix_hash::Kind,
/// All trees we currently hold in memory. Each of these may change while adding and removing entries.
/// null-object-ids mark tree-entries whose value we don't know yet, they are placeholders that will be
/// dropped when writing at the latest.
trees: std::collections::HashMap<BString, Tree>,
/// A buffer to build up paths when finding the tree to edit.
path_buf: RefCell<BString>,
/// Our buffer for storing tree-data in, right before decoding it.
tree_buf: Vec<u8>,
}
/// 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`].
///
/// Note that even though it can be created from any `u16`, it should be preferable to
/// create it by converting [`EntryKind`] into `EntryMode`.
#[derive(Clone, Copy, PartialEq, Eq, Ord, PartialOrd, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct EntryMode(pub u16);
impl std::fmt::Debug for EntryMode {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "EntryMode({:#o})", self.0)
}
}
/// A discretized version of ideal and valid values for entry modes.
///
/// Note that even though it can represent every valid [mode](EntryMode), it might
/// loose information due to that as well.
#[derive(Clone, Copy, PartialEq, Eq, Debug, Ord, PartialOrd, Hash)]
#[repr(u16)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub enum EntryKind {
/// 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 From<EntryKind> for EntryMode {
fn from(value: EntryKind) -> Self {
EntryMode(value as u16)
}
}
impl From<EntryMode> for EntryKind {
fn from(value: EntryMode) -> Self {
value.kind()
}
}
/// Serialization
impl EntryKind {
/// Return the representation as used in the git internal format.
pub fn as_octal_str(&self) -> &'static BStr {
use EntryKind::*;
let bytes: &[u8] = match self {
Tree => b"40000",
Blob => b"100644",
BlobExecutable => b"100755",
Link => b"120000",
Commit => b"160000",
};
bytes.into()
}
}
impl std::ops::Deref for EntryMode {
type Target = u16;
fn deref(&self) -> &Self::Target {
&self.0
}
}
const IFMT: u16 = 0o170000;
impl EntryMode {
/// Discretize the raw mode into an enum with well-known state while dropping unnecessary details.
pub const fn kind(&self) -> EntryKind {
let etype = self.0 & IFMT;
if etype == 0o100000 {
if self.0 & 0o000100 == 0o000100 {
EntryKind::BlobExecutable
} else {
EntryKind::Blob
}
} else if etype == EntryKind::Link as u16 {
EntryKind::Link
} else if etype == EntryKind::Tree as u16 {
EntryKind::Tree
} else {
EntryKind::Commit
}
}
/// Return true if this entry mode represents a Tree/directory
pub const fn is_tree(&self) -> bool {
self.0 & IFMT == EntryKind::Tree as u16
}
/// Return true if this entry mode represents the commit of a submodule.
pub const fn is_commit(&self) -> bool {
self.0 & IFMT == EntryKind::Commit as u16
}
/// Return true if this entry mode represents a symbolic link
pub const fn is_link(&self) -> bool {
self.0 & IFMT == EntryKind::Link as u16
}
/// Return true if this entry mode represents anything BUT Tree/directory
pub const fn is_no_tree(&self) -> bool {
self.0 & IFMT != EntryKind::Tree as u16
}
/// Return true if the entry is any kind of blob.
pub const fn is_blob(&self) -> bool {
self.0 & IFMT == 0o100000
}
/// Return true if the entry is an executable blob.
pub const fn is_executable(&self) -> bool {
matches!(self.kind(), EntryKind::BlobExecutable)
}
/// Return true if the entry is any kind of blob or symlink.
pub const fn is_blob_or_symlink(&self) -> bool {
matches!(
self.kind(),
EntryKind::Blob | EntryKind::BlobExecutable | EntryKind::Link
)
}
/// Represent the mode as descriptive string.
pub const fn as_str(&self) -> &'static str {
use EntryKind::*;
match self.kind() {
Tree => "tree",
Blob => "blob",
BlobExecutable => "exe",
Link => "link",
Commit => "commit",
}
}
/// Return the representation as used in the git internal format, which is octal and written
/// to the `backing` buffer. The respective sub-slice that was written to is returned.
pub fn as_bytes<'a>(&self, backing: &'a mut [u8; 6]) -> &'a BStr {
if self.0 == 0 {
std::slice::from_ref(&b'0')
} else {
let mut nb = 0;
let mut n = self.0;
while n > 0 {
let remainder = (n % 8) as u8;
backing[nb] = b'0' + remainder;
n /= 8;
nb += 1;
}
let res = &mut backing[..nb];
res.reverse();
res
}
.into()
}
}
impl TreeRef<'_> {
/// Convert this instance into its own version, creating a copy of all data.
///
/// This will temporarily allocate an extra copy in memory, so at worst three copies of the tree exist
/// at some intermediate point in time. Use [`Self::into_owned()`] to avoid this.
pub fn to_owned(&self) -> Tree {
self.clone().into()
}
/// Convert this instance into its own version, creating a copy of all data.
pub fn into_owned(self) -> Tree {
self.into()
}
}
/// An element of a [`TreeRef`][crate::TreeRef::entries].
#[derive(PartialEq, Eq, Debug, Hash, Clone, Copy)]
#[cfg_attr(feature = "serde", 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 = "serde", serde(borrow))]
pub oid: &'a gix_hash::oid,
}
impl PartialOrd for EntryRef<'_> {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl Ord for EntryRef<'_> {
fn cmp(&self, b: &Self) -> Ordering {
let a = self;
let common = a.filename.len().min(b.filename.len());
a.filename[..common].cmp(&b.filename[..common]).then_with(|| {
let a = a.filename.get(common).or_else(|| a.mode.is_tree().then_some(&b'/'));
let b = b.filename.get(common).or_else(|| b.mode.is_tree().then_some(&b'/'));
a.cmp(&b)
})
}
}
/// An entry in a [`Tree`], similar to an entry in a directory.
#[derive(PartialEq, Eq, Debug, Hash, Clone)]
#[cfg_attr(feature = "serde", 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: gix_hash::ObjectId,
}
impl PartialOrd for Entry {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl Ord for Entry {
fn cmp(&self, b: &Self) -> Ordering {
let a = self;
let common = a.filename.len().min(b.filename.len());
a.filename[..common].cmp(&b.filename[..common]).then_with(|| {
let a = a.filename.get(common).or_else(|| a.mode.is_tree().then_some(&b'/'));
let b = b.filename.get(common).or_else(|| b.mode.is_tree().then_some(&b'/'));
a.cmp(&b)
})
}
}