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TreeDiffIterator: simplify conditions by separating trees from non-trees

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This commit is contained in:
Martin von Zweigbergk 2021-05-19 16:16:35 -07:00
parent 29fe1e9737
commit ef6e5c7ec2
1 changed files with 45 additions and 52 deletions
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97
lib/src/trees.rs
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@ -166,62 +166,55 @@ impl Iterator for TreeDiffIterator {
// Note: whenever we say "file" below, it may also be a symlink or a conflict.
if let Some((name, before, after)) = self.entry_iterator.next() {
let tree_before = matches!(before, Some(TreeValue::Tree(_)));
let tree_after = matches!(after, Some(TreeValue::Tree(_)));
if tree_before || tree_after {
let subdir = RepoPathComponent::from(name.as_str());
let subdir_path = self.dir.join(&subdir);
let before_tree = match before {
Some(TreeValue::Tree(id_before)) => {
self.tree1.known_sub_tree(&subdir, &id_before)
}
_ => Tree::null(self.tree1.store().clone(), subdir_path.clone()),
};
let after_tree = match after {
Some(TreeValue::Tree(id_after)) => {
self.tree2.known_sub_tree(&subdir, &id_after)
}
_ => Tree::null(self.tree2.store().clone(), subdir_path.clone()),
};
self.subdir_iterator = Some(Box::new(TreeDiffIterator::new(
subdir_path,
before_tree,
after_tree,
)));
}
let file_path = self.dir.join(&RepoPathComponent::from(name.as_str()));
let subdir = RepoPathComponent::from(name.as_str());
let subdir_path = self.dir.join(&subdir);
// TODO: simplify this mess
match (before, after) {
(Some(TreeValue::Tree(id_before)), Some(TreeValue::Tree(id_after))) => {
self.subdir_iterator = Some(Box::new(TreeDiffIterator::new(
subdir_path,
self.tree1.known_sub_tree(&subdir, &id_before),
self.tree2.known_sub_tree(&subdir, &id_after),
)));
}
(Some(TreeValue::Tree(id_before)), Some(file_after)) => {
self.subdir_iterator = Some(Box::new(TreeDiffIterator::new(
subdir_path.clone(),
self.tree1.known_sub_tree(&subdir, &id_before),
Tree::null(self.tree2.store().clone(), subdir_path),
)));
self.added_file = Some((file_path, file_after.clone()));
}
(Some(file_before), Some(TreeValue::Tree(id_after))) => {
self.subdir_iterator = Some(Box::new(TreeDiffIterator::new(
subdir_path.clone(),
Tree::null(self.tree1.store().clone(), subdir_path),
self.tree2.known_sub_tree(&subdir, &id_after),
)));
if !tree_before && tree_after {
if let Some(file_before) = before {
return Some((file_path, Diff::Removed(file_before.clone())));
}
(Some(file_before), Some(file_after)) => {
return Some((
file_path,
Diff::Modified(file_before.clone(), file_after.clone()),
));
} else if tree_before && !tree_after {
if let Some(file_after) = after {
self.added_file = Some((file_path, file_after.clone()));
}
(None, Some(TreeValue::Tree(id_after))) => {
self.subdir_iterator = Some(Box::new(TreeDiffIterator::new(
subdir_path.clone(),
Tree::null(self.tree1.store().clone(), subdir_path),
self.tree2.known_sub_tree(&subdir, &id_after),
)));
}
(None, Some(value_after)) => {
return Some((file_path, Diff::Added(value_after.clone())));
}
(Some(TreeValue::Tree(id_before)), None) => {
self.subdir_iterator = Some(Box::new(TreeDiffIterator::new(
subdir_path.clone(),
self.tree1.known_sub_tree(&subdir, &id_before),
Tree::null(self.tree2.store().clone(), subdir_path),
)));
}
(Some(value_before), None) => {
return Some((file_path, Diff::Removed(value_before.clone())));
}
(None, None) => {
panic!("unexpected diff")
} else if !tree_before && !tree_after {
match (before, after) {
(Some(file_before), Some(file_after)) => {
return Some((
file_path,
Diff::Modified(file_before.clone(), file_after.clone()),
));
}
(None, Some(file_after)) => {
return Some((file_path, Diff::Added(file_after.clone())));
}
(Some(file_before), None) => {
return Some((file_path, Diff::Removed(file_before.clone())));
}
(None, None) => {
panic!("unexpected diff")
}
}
}
} else {