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evolution: create State struct in place

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I'm about to add more fields to the type and this will help to
slightly reduce the boilerplate for initializing and the maps and sets
and creating the struct.
This commit is contained in:
Martin von Zweigbergk 2020-12-23 09:58:13 -08:00
parent 66ba74cf5a
commit cc9008c6bb
1 changed files with 17 additions and 21 deletions
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38
lib/src/evolution.rs
View file

@ -28,7 +28,7 @@ use crate::transaction::{MutableRepo, Transaction};
use crate::trees::merge_trees;
use crate::view::View;
#[derive(Debug, Clone)]
#[derive(Debug, Clone, Default)]
struct State {
/// Contains all successors whether they have the same change id or not.
successors: HashMap<CommitId, HashSet<CommitId>>,
@ -41,10 +41,7 @@ struct State {
impl State {
fn calculate(store: &StoreWrapper, view: &dyn View) -> State {
let mut successors = HashMap::new();
let mut obsolete_commits = HashSet::new();
let mut orphan_commits = HashSet::new();
let mut divergent_changes = HashMap::new();
let mut state = State::default();
let mut heads = vec![];
for commit_id in view.heads() {
heads.push(store.get_commit(commit_id).unwrap());
@ -64,18 +61,19 @@ impl State {
// children of a commit
for commit in &commits {
if commit.is_pruned() {
obsolete_commits.insert(commit.id().clone());
state.obsolete_commits.insert(commit.id().clone());
}
for predecessor in commit.predecessors() {
if !commits.contains(&predecessor) {
continue;
}
successors
state
.successors
.entry(predecessor.id().clone())
.or_insert_with(HashSet::new)
.insert(commit.id().clone());
if predecessor.change_id() == commit.change_id() {
obsolete_commits.insert(predecessor.id().clone());
state.obsolete_commits.insert(predecessor.id().clone());
}
}
for parent in commit.parents() {
@ -86,33 +84,31 @@ impl State {
}
// Find divergent commits
for (change_id, commit_ids) in change_to_commits {
let divergent: HashSet<CommitId> =
commit_ids.difference(&obsolete_commits).cloned().collect();
let divergent: HashSet<CommitId> = commit_ids
.difference(&state.obsolete_commits)
.cloned()
.collect();
if divergent.len() > 1 {
divergent_changes.insert(change_id, divergent);
state.divergent_changes.insert(change_id, divergent);
}
}
// Find orphans by walking to the children of obsolete commits
let mut work: Vec<CommitId> = obsolete_commits.iter().map(ToOwned::to_owned).collect();
let mut work: Vec<CommitId> = state.obsolete_commits.iter().cloned().collect();
while !work.is_empty() {
let commit_id = work.pop().unwrap();
for child in children.get(&commit_id).unwrap() {
if orphan_commits.insert(child.clone()) {
if state.orphan_commits.insert(child.clone()) {
work.push(child.clone());
}
}
}
orphan_commits = orphan_commits
.difference(&obsolete_commits)
state.orphan_commits = state
.orphan_commits
.difference(&state.obsolete_commits)
.map(ToOwned::to_owned)
.collect();
State {
successors,
obsolete_commits,
orphan_commits,
divergent_changes,
}
state
}
fn successors(&self, commit_id: &CommitId) -> HashSet<CommitId> {