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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::{
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dirstate::EntryState, utils::files, DirsIterable, DirstateEntry,
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DirstateMapError,
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};
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use std::collections::hash_map::Entry;
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use std::collections::HashMap;
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#[derive(PartialEq, Debug)]
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pub struct DirsMultiset {
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inner: HashMap<Vec<u8>, u32>,
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}
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impl DirsMultiset {
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/// Initializes the multiset from a dirstate or a manifest.
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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 new(
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iterable: DirsIterable,
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skip_state: Option<EntryState>,
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) -> Self {
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let mut multiset = DirsMultiset {
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inner: HashMap::new(),
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};
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match iterable {
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DirsIterable::Dirstate(vec) => {
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for (filename, DirstateEntry { state, .. }) in vec {
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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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}
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DirsIterable::Manifest(vec) => {
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for filename in vec {
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multiset.add_path(filename);
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}
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}
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}
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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(&mut self, path: &[u8]) {
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for subpath in files::find_dirs(path) {
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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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}
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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: &[u8],
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) -> Result<(), DirstateMapError> {
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for subpath in files::find_dirs(path) {
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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.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: &[u8]) -> bool {
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self.inner.contains_key(key)
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}
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pub fn iter(&self) -> impl Iterator<Item = &Vec<u8>> {
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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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use std::collections::HashMap;
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#[test]
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fn test_delete_path_path_not_found() {
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let mut map = DirsMultiset::new(DirsIterable::Manifest(&vec![]), None);
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let path = b"doesnotexist/";
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assert_eq!(
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Err(DirstateMapError::PathNotFound(path.to_vec())),
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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::new(DirsIterable::Manifest(&vec![vec![]]), None);
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let path = 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_vec())),
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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)| (k.as_bytes().to_vec(), *v))
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.collect(),
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};
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assert_eq!(Ok(()), map.delete_path(b"a/b/"));
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assert_eq!(Ok(()), map.delete_path(b"a/b/"));
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assert_eq!(
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Err(DirstateMapError::PathNotFound(b"a/b/".to_vec())),
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map.delete_path(b"a/b/")
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);
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assert_eq!(2, *map.inner.get(&b"a".to_vec()).unwrap());
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assert_eq!(1, *map.inner.get(&b"a/c".to_vec()).unwrap());
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eprintln!("{:?}", map);
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assert_eq!(Ok(()), map.delete_path(b"a/"));
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eprintln!("{:?}", map);
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assert_eq!(Ok(()), map.delete_path(b"a/c/"));
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assert_eq!(
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Err(DirstateMapError::PathNotFound(b"a/c/".to_vec())),
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map.delete_path(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 mut map = DirsMultiset::new(DirsIterable::Manifest(&vec![]), None);
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let path = b"";
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map.add_path(path);
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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 mut map = DirsMultiset::new(DirsIterable::Manifest(&vec![]), None);
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map.add_path(b"a/");
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assert_eq!(1, *map.inner.get(&b"a".to_vec()).unwrap());
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assert_eq!(1, *map.inner.get(&Vec::new()).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(b"a");
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assert_eq!(1, *map.inner.get(&b"a".to_vec()).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(b"a/b");
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assert_eq!(2, *map.inner.get(&b"a".to_vec()).unwrap());
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assert_eq!(2, map.len());
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// Duplicate path works
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map.add_path(b"a/");
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assert_eq!(3, *map.inner.get(&b"a".to_vec()).unwrap());
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// Nested dir adds to its base
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map.add_path(b"a/b/");
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assert_eq!(4, *map.inner.get(&b"a".to_vec()).unwrap());
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assert_eq!(1, *map.inner.get(&b"a/b".to_vec()).unwrap());
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// but not its base's base, because it already existed
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map.add_path(b"a/b/c/");
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assert_eq!(4, *map.inner.get(&b"a".to_vec()).unwrap());
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assert_eq!(2, *map.inner.get(&b"a/b".to_vec()).unwrap());
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map.add_path(b"a/c/");
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assert_eq!(1, *map.inner.get(&b"a/c".to_vec()).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)| (k.as_bytes().to_vec(), *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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use DirsIterable::{Dirstate, Manifest};
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let new = DirsMultiset::new(Manifest(&vec![]), None);
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let expected = DirsMultiset {
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inner: HashMap::new(),
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};
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assert_eq!(expected, new);
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let new = DirsMultiset::new(Dirstate(&HashMap::new()), None);
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let expected = DirsMultiset {
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inner: HashMap::new(),
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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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use DirsIterable::{Dirstate, Manifest};
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let input_vec = ["a/", "b/", "a/c", "a/d/"]
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.iter()
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.map(|e| e.as_bytes().to_vec())
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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)| (k.as_bytes().to_vec(), *v))
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.collect();
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let new = DirsMultiset::new(Manifest(&input_vec), None);
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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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f.as_bytes().to_vec(),
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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)| (k.as_bytes().to_vec(), *v))
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.collect();
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let new = DirsMultiset::new(Dirstate(&input_map), None);
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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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use DirsIterable::{Dirstate, Manifest};
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let input_vec = ["a/", "b/", "a/c", "a/d/"]
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.iter()
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.map(|e| e.as_bytes().to_vec())
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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)| (k.as_bytes().to_vec(), *v))
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.collect();
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let new =
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DirsMultiset::new(Manifest(&input_vec), Some(EntryState::Normal));
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let expected = DirsMultiset {
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inner: expected_inner,
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};
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// Skip does not affect a manifest
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assert_eq!(expected, new);
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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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f.as_bytes().to_vec(),
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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)| (k.as_bytes().to_vec(), *v))
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.collect();
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let new =
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DirsMultiset::new(Dirstate(&input_map), Some(EntryState::Normal));
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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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