author | Arseniy Alekseyev <aalekseyev@janestreet.com> |
Tue, 12 Oct 2021 19:43:51 +0100 | |
changeset 48210 | 61ce70fd420e |
parent 47997 | 87e3f878e65f |
child 48569 | 20d0d896183e |
permissions | -rw-r--r-- |
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use crate::errors::HgError; |
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use crate::repo::Repo; |
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use crate::revlog::node::NULL_NODE; |
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use crate::revlog::revlog::{Revlog, RevlogError}; |
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use crate::revlog::Revision; |
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use crate::revlog::{Node, NodePrefix}; |
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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(repo: &Repo) -> Result<Self, HgError> { |
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let revlog = Revlog::open(repo, "00changelog.i", None)?; |
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Ok(Self { revlog }) |
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} |
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/// Return the `ChangelogEntry` 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<ChangelogEntry, 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` of the given revision number. |
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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<ChangelogEntry, RevlogError> { |
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let bytes = self.revlog.get_rev_data(rev)?; |
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Ok(ChangelogEntry { bytes }) |
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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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} |
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/// `Changelog` entry which knows how to interpret the `changelog` data bytes. |
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#[derive(Debug)] |
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pub struct ChangelogEntry { |
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/// The data bytes of the `changelog` entry. |
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bytes: Vec<u8>, |
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} |
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impl ChangelogEntry { |
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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 |
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.split(|b| b == &b'\n') |
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.filter(|line| !line.is_empty()) |
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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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match self.lines().next() { |
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None => Ok(NULL_NODE), |
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Some(x) => Node::from_hex_for_repo(x), |
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} |
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} |
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} |