rust/hg-core/src/dirstate/dirstate_map.rs
author Raphaël Gomès <rgomes@octobus.net>
Thu, 07 Nov 2019 11:13:31 +0100
changeset 43605 8210c3f46912
parent 42957 7a01778bc7b7
child 43788 1fe2e574616e
permissions -rw-r--r--
rust: introduce SIZE_FROM_OTHER_PARENT constant This will clarify what `-2` meant in the codebase. This change also merged imports in affected files for cleanup. Differential Revision: https://phab.mercurial-scm.org/D7301
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// dirstate_map.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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use crate::{
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    dirstate::{parsers::PARENT_SIZE, EntryState, SIZE_FROM_OTHER_PARENT},
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    pack_dirstate, parse_dirstate,
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    utils::{
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        files::normalize_case,
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        hg_path::{HgPath, HgPathBuf},
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    },
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    CopyMap, DirsMultiset, DirstateEntry, DirstateError, DirstateMapError,
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    DirstateParents, DirstateParseError, StateMap,
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};
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use core::borrow::Borrow;
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use std::collections::{HashMap, HashSet};
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use std::convert::TryInto;
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use std::iter::FromIterator;
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use std::ops::Deref;
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use std::time::Duration;
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pub type FileFoldMap = HashMap<HgPathBuf, HgPathBuf>;
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const NULL_ID: [u8; 20] = [0; 20];
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const MTIME_UNSET: i32 = -1;
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#[derive(Default)]
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pub struct DirstateMap {
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    state_map: StateMap,
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    pub copy_map: CopyMap,
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    file_fold_map: Option<FileFoldMap>,
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    pub dirs: Option<DirsMultiset>,
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    pub all_dirs: Option<DirsMultiset>,
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    non_normal_set: HashSet<HgPathBuf>,
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    other_parent_set: HashSet<HgPathBuf>,
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    parents: Option<DirstateParents>,
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    dirty_parents: bool,
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}
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/// Should only really be used in python interface code, for clarity
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impl Deref for DirstateMap {
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    type Target = StateMap;
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    fn deref(&self) -> &Self::Target {
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        &self.state_map
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    }
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}
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impl FromIterator<(HgPathBuf, DirstateEntry)> for DirstateMap {
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    fn from_iter<I: IntoIterator<Item = (HgPathBuf, DirstateEntry)>>(
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        iter: I,
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    ) -> Self {
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        Self {
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            state_map: iter.into_iter().collect(),
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            ..Self::default()
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        }
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    }
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}
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impl DirstateMap {
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    pub fn new() -> Self {
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        Self::default()
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    }
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    pub fn clear(&mut self) {
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        self.state_map.clear();
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        self.copy_map.clear();
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        self.file_fold_map = None;
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        self.non_normal_set.clear();
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        self.other_parent_set.clear();
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        self.set_parents(&DirstateParents {
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            p1: NULL_ID,
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            p2: NULL_ID,
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        })
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    }
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    /// Add a tracked file to the dirstate
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    pub fn add_file(
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        &mut self,
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        filename: &HgPath,
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        old_state: EntryState,
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        entry: DirstateEntry,
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    ) {
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        if old_state == EntryState::Unknown || old_state == EntryState::Removed
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        {
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            if let Some(ref mut dirs) = self.dirs {
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                dirs.add_path(filename)
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            }
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        }
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        if old_state == EntryState::Unknown {
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            if let Some(ref mut all_dirs) = self.all_dirs {
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                all_dirs.add_path(filename)
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            }
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        }
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        self.state_map.insert(filename.to_owned(), entry.to_owned());
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        if entry.state != EntryState::Normal || entry.mtime == MTIME_UNSET {
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            self.non_normal_set.insert(filename.to_owned());
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        }
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        if entry.size == SIZE_FROM_OTHER_PARENT {
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            self.other_parent_set.insert(filename.to_owned());
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        }
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    }
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    /// Mark a file as removed in the dirstate.
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    ///
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    /// The `size` parameter is used to store sentinel values that indicate
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    /// the file's previous state.  In the future, we should refactor this
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    /// to be more explicit about what that state is.
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    pub fn remove_file(
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        &mut self,
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        filename: &HgPath,
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        old_state: EntryState,
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        size: i32,
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    ) -> Result<(), DirstateMapError> {
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        if old_state != EntryState::Unknown && old_state != EntryState::Removed
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        {
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            if let Some(ref mut dirs) = self.dirs {
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                dirs.delete_path(filename)?;
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            }
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        }
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        if old_state == EntryState::Unknown {
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            if let Some(ref mut all_dirs) = self.all_dirs {
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                all_dirs.add_path(filename);
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            }
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        }
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        if let Some(ref mut file_fold_map) = self.file_fold_map {
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            file_fold_map.remove(&normalize_case(filename));
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        }
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        self.state_map.insert(
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            filename.to_owned(),
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            DirstateEntry {
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                state: EntryState::Removed,
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                mode: 0,
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                size,
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                mtime: 0,
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            },
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        );
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        self.non_normal_set.insert(filename.to_owned());
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        Ok(())
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    }
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    /// Remove a file from the dirstate.
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    /// Returns `true` if the file was previously recorded.
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    pub fn drop_file(
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        &mut self,
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        filename: &HgPath,
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        old_state: EntryState,
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    ) -> Result<bool, DirstateMapError> {
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        let exists = self.state_map.remove(filename).is_some();
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        if exists {
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            if old_state != EntryState::Removed {
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                if let Some(ref mut dirs) = self.dirs {
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                    dirs.delete_path(filename)?;
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                }
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            }
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            if let Some(ref mut all_dirs) = self.all_dirs {
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                all_dirs.delete_path(filename)?;
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            }
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        }
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        if let Some(ref mut file_fold_map) = self.file_fold_map {
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            file_fold_map.remove(&normalize_case(filename));
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        }
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        self.non_normal_set.remove(filename);
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        Ok(exists)
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    }
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    pub fn clear_ambiguous_times(
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        &mut self,
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        filenames: Vec<HgPathBuf>,
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        now: i32,
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    ) {
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        for filename in filenames {
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            let mut changed = false;
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            self.state_map
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                .entry(filename.to_owned())
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                .and_modify(|entry| {
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                    if entry.state == EntryState::Normal && entry.mtime == now
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                    {
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                        changed = true;
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                        *entry = DirstateEntry {
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                            mtime: MTIME_UNSET,
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                            ..*entry
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                        };
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                    }
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                });
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            if changed {
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                self.non_normal_set.insert(filename.to_owned());
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            }
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        }
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    }
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    pub fn non_normal_other_parent_entries(
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        &self,
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    ) -> (HashSet<HgPathBuf>, HashSet<HgPathBuf>) {
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        let mut non_normal = HashSet::new();
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        let mut other_parent = HashSet::new();
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        for (
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            filename,
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            DirstateEntry {
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                state, size, mtime, ..
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            },
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        ) in self.state_map.iter()
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        {
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            if *state != EntryState::Normal || *mtime == MTIME_UNSET {
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                non_normal.insert(filename.to_owned());
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            }
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            if *state == EntryState::Normal && *size == SIZE_FROM_OTHER_PARENT
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            {
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                other_parent.insert(filename.to_owned());
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            }
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        }
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        (non_normal, other_parent)
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    }
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    /// Both of these setters and their uses appear to be the simplest way to
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    /// emulate a Python lazy property, but it is ugly and unidiomatic.
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    /// TODO One day, rewriting this struct using the typestate might be a
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    /// good idea.
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    pub fn set_all_dirs(&mut self) {
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        if self.all_dirs.is_none() {
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            self.all_dirs =
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                Some(DirsMultiset::from_dirstate(&self.state_map, None));
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        }
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    }
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    pub fn set_dirs(&mut self) {
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        if self.dirs.is_none() {
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            self.dirs = Some(DirsMultiset::from_dirstate(
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                &self.state_map,
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                Some(EntryState::Removed),
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            ));
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        }
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    }
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    pub fn has_tracked_dir(&mut self, directory: &HgPath) -> bool {
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        self.set_dirs();
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        self.dirs.as_ref().unwrap().contains(directory)
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    }
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    pub fn has_dir(&mut self, directory: &HgPath) -> bool {
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        self.set_all_dirs();
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        self.all_dirs.as_ref().unwrap().contains(directory)
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    }
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    pub fn parents(
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        &mut self,
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        file_contents: &[u8],
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    ) -> Result<&DirstateParents, DirstateError> {
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        if let Some(ref parents) = self.parents {
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            return Ok(parents);
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        }
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        let parents;
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        if file_contents.len() == PARENT_SIZE * 2 {
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            parents = DirstateParents {
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                p1: file_contents[..PARENT_SIZE].try_into().unwrap(),
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                p2: file_contents[PARENT_SIZE..PARENT_SIZE * 2]
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                    .try_into()
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                    .unwrap(),
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            };
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        } else if file_contents.is_empty() {
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            parents = DirstateParents {
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                p1: NULL_ID,
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                p2: NULL_ID,
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            };
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        } else {
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            return Err(DirstateError::Parse(DirstateParseError::Damaged));
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        }
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        self.parents = Some(parents);
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        Ok(self.parents.as_ref().unwrap())
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    }
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    pub fn set_parents(&mut self, parents: &DirstateParents) {
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        self.parents = Some(parents.clone());
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        self.dirty_parents = true;
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    }
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    pub fn read(
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        &mut self,
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        file_contents: &[u8],
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    ) -> Result<Option<DirstateParents>, DirstateError> {
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        if file_contents.is_empty() {
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            return Ok(None);
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        }
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        let parents = parse_dirstate(
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            &mut self.state_map,
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            &mut self.copy_map,
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            file_contents,
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        )?;
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        if !self.dirty_parents {
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            self.set_parents(&parents);
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        }
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        Ok(Some(parents))
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    }
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    pub fn pack(
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        &mut self,
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        parents: DirstateParents,
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        now: Duration,
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    ) -> Result<Vec<u8>, DirstateError> {
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        let packed =
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            pack_dirstate(&mut self.state_map, &self.copy_map, parents, now)?;
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        self.dirty_parents = false;
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        let result = self.non_normal_other_parent_entries();
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        self.non_normal_set = result.0;
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        self.other_parent_set = result.1;
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        Ok(packed)
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    }
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    pub fn build_file_fold_map(&mut self) -> &FileFoldMap {
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        if let Some(ref file_fold_map) = self.file_fold_map {
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            return file_fold_map;
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        }
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        let mut new_file_fold_map = FileFoldMap::new();
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        for (filename, DirstateEntry { state, .. }) in self.state_map.borrow()
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        {
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   332
            if *state == EntryState::Removed {
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   333
                new_file_fold_map
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   334
                    .insert(normalize_case(filename), filename.to_owned());
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   335
            }
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   336
        }
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   337
        self.file_fold_map = Some(new_file_fold_map);
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   338
        self.file_fold_map.as_ref().unwrap()
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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_dirs_multiset() {
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   348
        let mut map = DirstateMap::new();
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        assert!(map.dirs.is_none());
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        assert!(map.all_dirs.is_none());
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   352
        assert_eq!(false, map.has_dir(HgPath::new(b"nope")));
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        assert!(map.all_dirs.is_some());
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        assert!(map.dirs.is_none());
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   356
        assert_eq!(false, map.has_tracked_dir(HgPath::new(b"nope")));
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        assert!(map.dirs.is_some());
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    }
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    #[test]
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   361
    fn test_add_file() {
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   362
        let mut map = DirstateMap::new();
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   363
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        assert_eq!(0, map.len());
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        map.add_file(
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   367
            HgPath::new(b"meh"),
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            EntryState::Normal,
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            DirstateEntry {
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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                state: EntryState::Normal,
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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   371
                mode: 1337,
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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   372
                mtime: 1337,
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   373
                size: 1337,
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   374
            },
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   375
        );
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   376
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   377
        assert_eq!(1, map.len());
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        assert_eq!(0, map.non_normal_set.len());
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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        assert_eq!(0, map.other_parent_set.len());
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    }
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   381
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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   382
    #[test]
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   383
    fn test_non_normal_other_parent_entries() {
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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   384
        let map: DirstateMap = [
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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   385
            (b"f1", (EntryState::Removed, 1337, 1337, 1337)),
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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   386
            (b"f2", (EntryState::Normal, 1337, 1337, -1)),
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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   387
            (b"f3", (EntryState::Normal, 1337, 1337, 1337)),
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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   388
            (b"f4", (EntryState::Normal, 1337, -2, 1337)),
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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   389
            (b"f5", (EntryState::Added, 1337, 1337, 1337)),
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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diff changeset
   390
            (b"f6", (EntryState::Added, 1337, 1337, -1)),
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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diff changeset
   391
            (b"f7", (EntryState::Merged, 1337, 1337, -1)),
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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parents:
diff changeset
   392
            (b"f8", (EntryState::Merged, 1337, 1337, 1337)),
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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parents:
diff changeset
   393
            (b"f9", (EntryState::Merged, 1337, -2, 1337)),
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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parents:
diff changeset
   394
            (b"fa", (EntryState::Added, 1337, -2, 1337)),
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   395
            (b"fb", (EntryState::Removed, 1337, -2, 1337)),
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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diff changeset
   396
        ]
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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diff changeset
   397
        .iter()
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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diff changeset
   398
        .map(|(fname, (state, mode, size, mtime))| {
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   399
            (
42957
7a01778bc7b7 rust-hgpath: replace all paths and filenames with HgPath/HgPathBuf
Raphaël Gomès <rgomes@octobus.net>
parents: 42840
diff changeset
   400
                HgPathBuf::from_bytes(fname.as_ref()),
42753
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
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parents:
diff changeset
   401
                DirstateEntry {
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
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   402
                    state: *state,
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
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diff changeset
   403
                    mode: *mode,
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   404
                    size: *size,
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   405
                    mtime: *mtime,
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
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diff changeset
   406
                },
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   407
            )
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   408
        })
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   409
        .collect();
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   410
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   411
        let non_normal = [
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   412
            b"f1", b"f2", b"f5", b"f6", b"f7", b"f8", b"f9", b"fa", b"fb",
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   413
        ]
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   414
        .iter()
42957
7a01778bc7b7 rust-hgpath: replace all paths and filenames with HgPath/HgPathBuf
Raphaël Gomès <rgomes@octobus.net>
parents: 42840
diff changeset
   415
        .map(|x| HgPathBuf::from_bytes(x.as_ref()))
42753
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   416
        .collect();
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   417
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   418
        let mut other_parent = HashSet::new();
42957
7a01778bc7b7 rust-hgpath: replace all paths and filenames with HgPath/HgPathBuf
Raphaël Gomès <rgomes@octobus.net>
parents: 42840
diff changeset
   419
        other_parent.insert(HgPathBuf::from_bytes(b"f4"));
42753
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   420
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   421
        assert_eq!(
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   422
            (non_normal, other_parent),
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   423
            map.non_normal_other_parent_entries()
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   424
        );
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   425
    }
fce6dc93a510 rust-dirstate: rust implementation of dirstatemap
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   426
}