author | Martin von Zweigbergk <martinvonz@google.com> |
Tue, 05 Apr 2022 12:06:32 -0700 | |
changeset 49065 | 5d205e476057 |
parent 49064 | 95da3e99cbd8 |
child 49087 | bfc117647c71 |
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::revlog::{Revlog, RevlogEntry, RevlogError}; |
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use crate::revlog::Revision; |
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use crate::revlog::{Node, NodePrefix}; |
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use crate::utils::hg_path::HgPath; |
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use itertools::Itertools; |
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use std::ascii::escape_default; |
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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(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<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 `RevlogEntry` of 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<RevlogEntry, RevlogError> { |
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self.revlog.get_entry(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<ChangelogRevisionData, RevlogError> { |
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let bytes = self.revlog.get_rev_data(rev)?.into_owned(); |
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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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rev, err |
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))) |
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})?) |
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} |
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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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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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|
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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 { |
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/// The data bytes of the `changelog` entry. |
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bytes: Vec<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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|
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impl ChangelogRevisionData { |
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fn new(bytes: Vec<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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103 |
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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106 |
})?; |
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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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113 |
)); |
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114 |
} |
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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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120 |
|
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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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|
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fn null() -> Self { |
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Self::new( |
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b"0000000000000000000000000000000000000000\n\n0 0\n\n".to_vec(), |
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133 |
) |
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.unwrap() |
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} |
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136 |
|
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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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|
141 |
|
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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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148 |
|
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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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153 |
} |
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|
154 |
|
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/// The full timestamp line (timestamp in seconds, offset in seconds, and |
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156 |
/// possibly extras) |
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// TODO: We should expose this in a more useful way |
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158 |
pub fn timestamp_line(&self) -> &[u8] { |
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&self.bytes[self.user_end + 1..self.timestamp_end] |
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160 |
} |
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|
161 |
|
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162 |
/// The files changed in this revision. |
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163 |
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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165 |
.split(|b| b == &b'\n') |
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166 |
.map(|path| HgPath::new(path)) |
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167 |
} |
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168 |
|
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169 |
/// The change description. |
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pub fn description(&self) -> &[u8] { |
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171 |
&self.bytes[self.files_end + 2..] |
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172 |
} |
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173 |
} |
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174 |
|
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175 |
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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178 |
.field("bytes", &debug_bytes(&self.bytes)) |
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179 |
.field("manifest", &debug_bytes(&self.bytes[..self.manifest_end])) |
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180 |
.field( |
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181 |
"user", |
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182 |
&debug_bytes( |
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183 |
&self.bytes[self.manifest_end + 1..self.user_end], |
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184 |
), |
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185 |
) |
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186 |
.field( |
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187 |
"timestamp", |
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188 |
&debug_bytes( |
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189 |
&self.bytes[self.user_end + 1..self.timestamp_end], |
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190 |
), |
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191 |
) |
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192 |
.field( |
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193 |
"files", |
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194 |
&debug_bytes( |
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195 |
&self.bytes[self.timestamp_end + 1..self.files_end], |
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196 |
), |
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197 |
) |
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198 |
.field( |
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199 |
"description", |
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&debug_bytes(&self.bytes[self.files_end + 2..]), |
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201 |
) |
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202 |
.finish() |
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203 |
} |
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204 |
} |
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205 |
|
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206 |
fn debug_bytes(bytes: &[u8]) -> String { |
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207 |
String::from_utf8_lossy( |
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&bytes.iter().flat_map(|b| escape_default(*b)).collect_vec(), |
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209 |
) |
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210 |
.to_string() |
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211 |
} |
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212 |
|
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#[cfg(test)] |
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mod tests { |
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use super::*; |
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use itertools::Itertools; |
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use pretty_assertions::assert_eq; |
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|
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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(b"abcd".to_vec()).is_err()); |
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// No newline after manifest |
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assert!(ChangelogRevisionData::new(b"abcd".to_vec()).is_err()); |
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// No newline after user |
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assert!(ChangelogRevisionData::new(b"abcd\n".to_vec()).is_err()); |
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// No newline after timestamp |
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assert!(ChangelogRevisionData::new(b"abcd\n\n0 0".to_vec()).is_err()); |
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// Missing newline after files |
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assert!(ChangelogRevisionData::new( |
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b"abcd\n\n0 0\nfile1\nfile2".to_vec() |
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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( |
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b"abcd\n\n0 0\nfile1\nfile2\n".to_vec() |
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) |
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.is_err(),); |
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} |
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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( |
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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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|
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some |
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commit |
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message" |
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.to_vec(), |
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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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} |