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use crate::errors::HgError;
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use crate::revlog::Revision;
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use crate::revlog::{Node, NodePrefix};
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use crate::revlog::{Revlog, RevlogEntry, RevlogError};
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use crate::utils::hg_path::HgPath;
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use crate::vfs::Vfs;
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use itertools::Itertools;
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use std::ascii::escape_default;
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use std::borrow::Cow;
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use std::fmt::{Debug, Formatter};
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/// A specialized `Revlog` to work with changelog data format.
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pub struct Changelog {
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/// The generic `revlog` format.
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pub(crate) revlog: Revlog,
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}
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impl Changelog {
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/// Open the `changelog` of a repository given by its root.
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pub fn open(store_vfs: &Vfs, use_nodemap: bool) -> Result<Self, HgError> {
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let revlog =
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Revlog::open(store_vfs, "00changelog.i", None, use_nodemap)?;
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Ok(Self { revlog })
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}
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/// Return the `ChangelogRevisionData` for the given node ID.
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pub fn data_for_node(
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&self,
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node: NodePrefix,
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) -> Result<ChangelogRevisionData, RevlogError> {
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let rev = self.revlog.rev_from_node(node)?;
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self.data_for_rev(rev)
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}
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/// Return the [`ChangelogEntry`] for the given revision number.
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pub fn entry_for_rev(
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&self,
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rev: Revision,
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) -> Result<ChangelogEntry, RevlogError> {
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let revlog_entry = self.revlog.get_entry(rev)?;
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Ok(ChangelogEntry { revlog_entry })
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}
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/// Return the [`ChangelogRevisionData`] for the given revision number.
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///
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/// This is a useful shortcut in case the caller does not need the
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/// generic revlog information (parents, hashes etc). Otherwise
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/// consider taking a [`ChangelogEntry`] with
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/// [entry_for_rev](`Self::entry_for_rev`) and doing everything from there.
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pub fn data_for_rev(
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&self,
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rev: Revision,
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) -> Result<ChangelogRevisionData, RevlogError> {
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self.entry_for_rev(rev)?.data()
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}
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pub fn node_from_rev(&self, rev: Revision) -> Option<&Node> {
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self.revlog.node_from_rev(rev)
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}
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pub fn rev_from_node(
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&self,
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node: NodePrefix,
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) -> Result<Revision, RevlogError> {
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self.revlog.rev_from_node(node)
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}
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}
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/// A specialized `RevlogEntry` for `changelog` data format
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///
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/// This is a `RevlogEntry` with the added semantics that the associated
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/// data should meet the requirements for `changelog`, materialized by
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/// the fact that `data()` constructs a `ChangelogRevisionData`.
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/// In case that promise would be broken, the `data` method returns an error.
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#[derive(Clone)]
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pub struct ChangelogEntry<'changelog> {
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/// Same data, as a generic `RevlogEntry`.
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pub(crate) revlog_entry: RevlogEntry<'changelog>,
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}
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impl<'changelog> ChangelogEntry<'changelog> {
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pub fn data<'a>(
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&'a self,
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) -> Result<ChangelogRevisionData<'changelog>, RevlogError> {
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let bytes = self.revlog_entry.data()?;
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if bytes.is_empty() {
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Ok(ChangelogRevisionData::null())
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} else {
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Ok(ChangelogRevisionData::new(bytes).map_err(|err| {
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RevlogError::Other(HgError::CorruptedRepository(format!(
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"Invalid changelog data for revision {}: {:?}",
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self.revlog_entry.revision(),
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err
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)))
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})?)
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}
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}
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/// Obtain a reference to the underlying `RevlogEntry`.
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///
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/// This allows the caller to access the information that is common
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/// to all revlog entries: revision number, node id, parent revisions etc.
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pub fn as_revlog_entry(&self) -> &RevlogEntry {
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&self.revlog_entry
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}
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pub fn p1_entry(&self) -> Result<Option<ChangelogEntry>, RevlogError> {
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Ok(self
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.revlog_entry
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.p1_entry()?
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.map(|revlog_entry| Self { revlog_entry }))
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}
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pub fn p2_entry(&self) -> Result<Option<ChangelogEntry>, RevlogError> {
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Ok(self
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.revlog_entry
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.p2_entry()?
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.map(|revlog_entry| Self { revlog_entry }))
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}
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}
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/// `Changelog` entry which knows how to interpret the `changelog` data bytes.
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#[derive(PartialEq)]
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pub struct ChangelogRevisionData<'changelog> {
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/// The data bytes of the `changelog` entry.
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bytes: Cow<'changelog, [u8]>,
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/// The end offset for the hex manifest (not including the newline)
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manifest_end: usize,
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/// The end offset for the user+email (not including the newline)
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user_end: usize,
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/// The end offset for the timestamp+timezone+extras (not including the
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/// newline)
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timestamp_end: usize,
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/// The end offset for the file list (not including the newline)
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files_end: usize,
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}
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impl<'changelog> ChangelogRevisionData<'changelog> {
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fn new(bytes: Cow<'changelog, [u8]>) -> Result<Self, HgError> {
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let mut line_iter = bytes.split(|b| b == &b'\n');
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let manifest_end = line_iter
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.next()
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.expect("Empty iterator from split()?")
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.len();
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let user_slice = line_iter.next().ok_or_else(|| {
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HgError::corrupted("Changeset data truncated after manifest line")
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})?;
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let user_end = manifest_end + 1 + user_slice.len();
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let timestamp_slice = line_iter.next().ok_or_else(|| {
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HgError::corrupted("Changeset data truncated after user line")
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})?;
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let timestamp_end = user_end + 1 + timestamp_slice.len();
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let mut files_end = timestamp_end + 1;
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loop {
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let line = line_iter.next().ok_or_else(|| {
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HgError::corrupted("Changeset data truncated in files list")
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})?;
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if line.is_empty() {
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if files_end == bytes.len() {
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// The list of files ended with a single newline (there
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// should be two)
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return Err(HgError::corrupted(
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"Changeset data truncated after files list",
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));
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}
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files_end -= 1;
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break;
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}
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files_end += line.len() + 1;
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}
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Ok(Self {
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bytes,
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manifest_end,
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user_end,
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timestamp_end,
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files_end,
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})
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}
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fn null() -> Self {
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Self::new(Cow::Borrowed(
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b"0000000000000000000000000000000000000000\n\n0 0\n\n",
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))
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.unwrap()
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}
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/// Return an iterator over the lines of the entry.
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pub fn lines(&self) -> impl Iterator<Item = &[u8]> {
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self.bytes.split(|b| b == &b'\n')
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}
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/// Return the node id of the `manifest` referenced by this `changelog`
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/// entry.
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pub fn manifest_node(&self) -> Result<Node, HgError> {
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let manifest_node_hex = &self.bytes[..self.manifest_end];
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Node::from_hex_for_repo(manifest_node_hex)
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}
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/// The full user string (usually a name followed by an email enclosed in
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/// angle brackets)
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pub fn user(&self) -> &[u8] {
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&self.bytes[self.manifest_end + 1..self.user_end]
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}
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/// The full timestamp line (timestamp in seconds, offset in seconds, and
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/// possibly extras)
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// TODO: We should expose this in a more useful way
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pub fn timestamp_line(&self) -> &[u8] {
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&self.bytes[self.user_end + 1..self.timestamp_end]
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}
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/// The files changed in this revision.
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pub fn files(&self) -> impl Iterator<Item = &HgPath> {
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self.bytes[self.timestamp_end + 1..self.files_end]
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.split(|b| b == &b'\n')
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.map(HgPath::new)
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}
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/// The change description.
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pub fn description(&self) -> &[u8] {
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&self.bytes[self.files_end + 2..]
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}
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}
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impl Debug for ChangelogRevisionData<'_> {
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fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
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f.debug_struct("ChangelogRevisionData")
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.field("bytes", &debug_bytes(&self.bytes))
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.field("manifest", &debug_bytes(&self.bytes[..self.manifest_end]))
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.field(
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"user",
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&debug_bytes(
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&self.bytes[self.manifest_end + 1..self.user_end],
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),
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)
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.field(
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"timestamp",
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&debug_bytes(
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&self.bytes[self.user_end + 1..self.timestamp_end],
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),
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)
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.field(
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"files",
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&debug_bytes(
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&self.bytes[self.timestamp_end + 1..self.files_end],
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),
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)
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.field(
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"description",
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&debug_bytes(&self.bytes[self.files_end + 2..]),
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)
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.finish()
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}
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}
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fn debug_bytes(bytes: &[u8]) -> String {
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String::from_utf8_lossy(
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&bytes.iter().flat_map(|b| escape_default(*b)).collect_vec(),
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)
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.to_string()
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::vfs::Vfs;
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use crate::NULL_REVISION;
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use pretty_assertions::assert_eq;
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#[test]
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fn test_create_changelogrevisiondata_invalid() {
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// Completely empty
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assert!(ChangelogRevisionData::new(Cow::Borrowed(b"abcd")).is_err());
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// No newline after manifest
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assert!(ChangelogRevisionData::new(Cow::Borrowed(b"abcd")).is_err());
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// No newline after user
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assert!(ChangelogRevisionData::new(Cow::Borrowed(b"abcd\n")).is_err());
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// No newline after timestamp
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assert!(
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ChangelogRevisionData::new(Cow::Borrowed(b"abcd\n\n0 0")).is_err()
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);
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// Missing newline after files
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assert!(ChangelogRevisionData::new(Cow::Borrowed(
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b"abcd\n\n0 0\nfile1\nfile2"
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))
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.is_err(),);
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// Only one newline after files
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assert!(ChangelogRevisionData::new(Cow::Borrowed(
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b"abcd\n\n0 0\nfile1\nfile2\n"
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))
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.is_err(),);
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}
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#[test]
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fn test_create_changelogrevisiondata() {
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let data = ChangelogRevisionData::new(Cow::Borrowed(
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b"0123456789abcdef0123456789abcdef01234567
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Some One <someone@example.com>
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0 0
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file1
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file2
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some
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commit
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message",
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))
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.unwrap();
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assert_eq!(
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data.manifest_node().unwrap(),
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Node::from_hex("0123456789abcdef0123456789abcdef01234567")
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.unwrap()
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);
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assert_eq!(data.user(), b"Some One <someone@example.com>");
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assert_eq!(data.timestamp_line(), b"0 0");
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assert_eq!(
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data.files().collect_vec(),
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vec![HgPath::new("file1"), HgPath::new("file2")]
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);
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assert_eq!(data.description(), b"some\ncommit\nmessage");
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}
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#[test]
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fn test_data_from_rev_null() -> Result<(), RevlogError> {
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// an empty revlog will be enough for this case
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let temp = tempfile::tempdir().unwrap();
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let vfs = Vfs { base: temp.path() };
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std::fs::write(temp.path().join("foo.i"), b"").unwrap();
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let revlog = Revlog::open(&vfs, "foo.i", None, false).unwrap();
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let changelog = Changelog { revlog };
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assert_eq!(
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changelog.data_for_rev(NULL_REVISION)?,
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ChangelogRevisionData::null()
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);
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// same with the intermediate entry object
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assert_eq!(
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changelog.entry_for_rev(NULL_REVISION)?.data()?,
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ChangelogRevisionData::null()
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);
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Ok(())
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}
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}
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