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// dirs_multiset.rs
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//
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// Copyright 2019 Raphaël Gomès <rgomes@octobus.net>
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//
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// This software may be used and distributed according to the terms of the
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// GNU General Public License version 2 or any later version.
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//! A multiset of directory names.
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//!
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//! Used to counts the references to directories in a manifest or dirstate.
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use crate::utils::hg_path::{HgPath, HgPathBuf};
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use crate::{
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dirstate::EntryState, utils::files, DirstateEntry, DirstateMapError,
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FastHashMap,
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};
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use std::collections::hash_map::{self, Entry};
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// could be encapsulated if we care API stability more seriously
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pub type DirsMultisetIter<'a> = hash_map::Keys<'a, HgPathBuf, u32>;
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#[derive(PartialEq, Debug)]
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pub struct DirsMultiset {
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inner: FastHashMap<HgPathBuf, u32>,
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}
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impl DirsMultiset {
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/// Initializes the multiset from a dirstate.
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///
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/// If `skip_state` is provided, skips dirstate entries with equal state.
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pub fn from_dirstate(
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dirstate: &FastHashMap<HgPathBuf, DirstateEntry>,
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skip_state: Option<EntryState>,
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) -> Result<Self, DirstateMapError> {
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let mut multiset = DirsMultiset {
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inner: FastHashMap::default(),
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};
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for (filename, DirstateEntry { state, .. }) in dirstate {
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// This `if` is optimized out of the loop
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if let Some(skip) = skip_state {
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if skip != *state {
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multiset.add_path(filename)?;
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}
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} else {
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multiset.add_path(filename)?;
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}
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}
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Ok(multiset)
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}
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/// Initializes the multiset from a manifest.
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pub fn from_manifest(
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manifest: &[impl AsRef<HgPath>],
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) -> Result<Self, DirstateMapError> {
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let mut multiset = DirsMultiset {
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inner: FastHashMap::default(),
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};
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for filename in manifest {
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multiset.add_path(filename.as_ref())?;
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}
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Ok(multiset)
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}
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/// Increases the count of deepest directory contained in the path.
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///
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/// If the directory is not yet in the map, adds its parents.
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pub fn add_path(
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&mut self,
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path: impl AsRef<HgPath>,
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) -> Result<(), DirstateMapError> {
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for subpath in files::find_dirs(path.as_ref()) {
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if subpath.as_bytes().last() == Some(&b'/') {
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// TODO Remove this once PathAuditor is certified
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// as the only entrypoint for path data
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return Err(DirstateMapError::ConsecutiveSlashes);
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}
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if let Some(val) = self.inner.get_mut(subpath) {
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*val += 1;
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break;
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}
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self.inner.insert(subpath.to_owned(), 1);
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}
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Ok(())
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}
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/// Decreases the count of deepest directory contained in the path.
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///
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/// If it is the only reference, decreases all parents until one is
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/// removed.
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/// If the directory is not in the map, something horrible has happened.
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pub fn delete_path(
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&mut self,
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path: impl AsRef<HgPath>,
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) -> Result<(), DirstateMapError> {
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for subpath in files::find_dirs(path.as_ref()) {
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match self.inner.entry(subpath.to_owned()) {
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Entry::Occupied(mut entry) => {
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let val = entry.get().clone();
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if val > 1 {
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entry.insert(val - 1);
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break;
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}
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entry.remove();
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}
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Entry::Vacant(_) => {
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return Err(DirstateMapError::PathNotFound(
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path.as_ref().to_owned(),
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))
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}
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};
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}
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Ok(())
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}
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pub fn contains(&self, key: impl AsRef<HgPath>) -> bool {
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self.inner.contains_key(key.as_ref())
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}
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pub fn iter(&self) -> DirsMultisetIter {
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self.inner.keys()
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}
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pub fn len(&self) -> usize {
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self.inner.len()
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}
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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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#[test]
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fn test_delete_path_path_not_found() {
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let manifest: Vec<HgPathBuf> = vec![];
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let mut map = DirsMultiset::from_manifest(&manifest).unwrap();
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let path = HgPathBuf::from_bytes(b"doesnotexist/");
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assert_eq!(
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Err(DirstateMapError::PathNotFound(path.to_owned())),
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map.delete_path(&path)
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);
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}
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#[test]
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fn test_delete_path_empty_path() {
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let mut map =
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DirsMultiset::from_manifest(&vec![HgPathBuf::new()]).unwrap();
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let path = HgPath::new(b"");
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assert_eq!(Ok(()), map.delete_path(path));
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assert_eq!(
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Err(DirstateMapError::PathNotFound(path.to_owned())),
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map.delete_path(path)
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);
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}
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#[test]
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fn test_delete_path_successful() {
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let mut map = DirsMultiset {
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inner: [("", 5), ("a", 3), ("a/b", 2), ("a/c", 1)]
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.iter()
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.map(|(k, v)| (HgPathBuf::from_bytes(k.as_bytes()), *v))
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.collect(),
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};
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assert_eq!(Ok(()), map.delete_path(HgPath::new(b"a/b/")));
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eprintln!("{:?}", map);
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assert_eq!(Ok(()), map.delete_path(HgPath::new(b"a/b/")));
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eprintln!("{:?}", map);
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assert_eq!(
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Err(DirstateMapError::PathNotFound(HgPathBuf::from_bytes(
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b"a/b/"
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))),
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map.delete_path(HgPath::new(b"a/b/"))
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);
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assert_eq!(2, *map.inner.get(HgPath::new(b"a")).unwrap());
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assert_eq!(1, *map.inner.get(HgPath::new(b"a/c")).unwrap());
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eprintln!("{:?}", map);
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assert_eq!(Ok(()), map.delete_path(HgPath::new(b"a/")));
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eprintln!("{:?}", map);
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assert_eq!(Ok(()), map.delete_path(HgPath::new(b"a/c/")));
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assert_eq!(
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Err(DirstateMapError::PathNotFound(HgPathBuf::from_bytes(
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b"a/c/"
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))),
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map.delete_path(HgPath::new(b"a/c/"))
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);
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}
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#[test]
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fn test_add_path_empty_path() {
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let manifest: Vec<HgPathBuf> = vec![];
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let mut map = DirsMultiset::from_manifest(&manifest).unwrap();
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let path = HgPath::new(b"");
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map.add_path(path).unwrap();
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assert_eq!(1, map.len());
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}
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#[test]
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fn test_add_path_successful() {
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let manifest: Vec<HgPathBuf> = vec![];
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let mut map = DirsMultiset::from_manifest(&manifest).unwrap();
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map.add_path(HgPath::new(b"a/")).unwrap();
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assert_eq!(1, *map.inner.get(HgPath::new(b"a")).unwrap());
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assert_eq!(1, *map.inner.get(HgPath::new(b"")).unwrap());
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assert_eq!(2, map.len());
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// Non directory should be ignored
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map.add_path(HgPath::new(b"a")).unwrap();
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assert_eq!(1, *map.inner.get(HgPath::new(b"a")).unwrap());
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assert_eq!(2, map.len());
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// Non directory will still add its base
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map.add_path(HgPath::new(b"a/b")).unwrap();
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assert_eq!(2, *map.inner.get(HgPath::new(b"a")).unwrap());
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assert_eq!(2, map.len());
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// Duplicate path works
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map.add_path(HgPath::new(b"a/")).unwrap();
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assert_eq!(3, *map.inner.get(HgPath::new(b"a")).unwrap());
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// Nested dir adds to its base
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map.add_path(HgPath::new(b"a/b/")).unwrap();
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assert_eq!(4, *map.inner.get(HgPath::new(b"a")).unwrap());
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assert_eq!(1, *map.inner.get(HgPath::new(b"a/b")).unwrap());
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// but not its base's base, because it already existed
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map.add_path(HgPath::new(b"a/b/c/")).unwrap();
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assert_eq!(4, *map.inner.get(HgPath::new(b"a")).unwrap());
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assert_eq!(2, *map.inner.get(HgPath::new(b"a/b")).unwrap());
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map.add_path(HgPath::new(b"a/c/")).unwrap();
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assert_eq!(1, *map.inner.get(HgPath::new(b"a/c")).unwrap());
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let expected = DirsMultiset {
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inner: [("", 2), ("a", 5), ("a/b", 2), ("a/b/c", 1), ("a/c", 1)]
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.iter()
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.map(|(k, v)| (HgPathBuf::from_bytes(k.as_bytes()), *v))
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.collect(),
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};
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assert_eq!(map, expected);
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}
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#[test]
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fn test_dirsmultiset_new_empty() {
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let manifest: Vec<HgPathBuf> = vec![];
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let new = DirsMultiset::from_manifest(&manifest).unwrap();
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let expected = DirsMultiset {
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inner: FastHashMap::default(),
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};
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assert_eq!(expected, new);
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let new = DirsMultiset::from_dirstate(&FastHashMap::default(), None)
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.unwrap();
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let expected = DirsMultiset {
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inner: FastHashMap::default(),
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};
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assert_eq!(expected, new);
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}
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#[test]
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fn test_dirsmultiset_new_no_skip() {
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let input_vec: Vec<HgPathBuf> = ["a/", "b/", "a/c", "a/d/"]
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.iter()
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.map(|e| HgPathBuf::from_bytes(e.as_bytes()))
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.collect();
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let expected_inner = [("", 2), ("a", 3), ("b", 1), ("a/d", 1)]
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.iter()
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.map(|(k, v)| (HgPathBuf::from_bytes(k.as_bytes()), *v))
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.collect();
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let new = DirsMultiset::from_manifest(&input_vec).unwrap();
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let expected = DirsMultiset {
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inner: expected_inner,
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};
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assert_eq!(expected, new);
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let input_map = ["a/", "b/", "a/c", "a/d/"]
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.iter()
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.map(|f| {
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(
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HgPathBuf::from_bytes(f.as_bytes()),
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DirstateEntry {
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state: EntryState::Normal,
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mode: 0,
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mtime: 0,
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size: 0,
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},
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)
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})
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.collect();
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let expected_inner = [("", 2), ("a", 3), ("b", 1), ("a/d", 1)]
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.iter()
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.map(|(k, v)| (HgPathBuf::from_bytes(k.as_bytes()), *v))
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.collect();
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let new = DirsMultiset::from_dirstate(&input_map, None).unwrap();
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let expected = DirsMultiset {
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inner: expected_inner,
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};
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assert_eq!(expected, new);
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}
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#[test]
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fn test_dirsmultiset_new_skip() {
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let input_map = [
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("a/", EntryState::Normal),
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("a/b/", EntryState::Normal),
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("a/c", EntryState::Removed),
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("a/d/", EntryState::Merged),
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]
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.iter()
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.map(|(f, state)| {
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(
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HgPathBuf::from_bytes(f.as_bytes()),
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DirstateEntry {
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state: *state,
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mode: 0,
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mtime: 0,
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size: 0,
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},
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)
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})
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.collect();
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// "a" incremented with "a/c" and "a/d/"
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let expected_inner = [("", 1), ("a", 2), ("a/d", 1)]
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.iter()
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.map(|(k, v)| (HgPathBuf::from_bytes(k.as_bytes()), *v))
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.collect();
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let new =
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DirsMultiset::from_dirstate(&input_map, Some(EntryState::Normal))
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.unwrap();
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let expected = DirsMultiset {
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inner: expected_inner,
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};
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assert_eq!(expected, new);
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}
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}
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