index: move default_index_store.rs to sub directory named default_index

default_index_store.rs is relatively big, and it contains types and impls in
arbitrary order. Let's split them into sub modules. After everything moved,
mod.rs will only contain tests.

cli/src/commands/debug.rs

@@ -18,7 +18,7 @@ use std::io::Write as _;
 
 use clap::Subcommand;
 use jj_lib::backend::ObjectId;
-use jj_lib::default_index_store::{DefaultIndexStore, DefaultReadonlyIndex};
+use jj_lib::default_index::{DefaultIndexStore, DefaultReadonlyIndex};
 use jj_lib::local_working_copy::LocalWorkingCopy;
 use jj_lib::revset;
 use jj_lib::working_copy::WorkingCopy;

lib/src/default_revset_engine.rs

@@ -24,7 +24,7 @@ use std::sync::Arc;
 use itertools::Itertools;
 
 use crate::backend::{ChangeId, CommitId, MillisSinceEpoch};
-use crate::default_index_store::{CompositeIndex, IndexEntry, IndexEntryByPosition, IndexPosition};
+use crate::default_index::{CompositeIndex, IndexEntry, IndexEntryByPosition, IndexPosition};
 use crate::default_revset_graph_iterator::RevsetGraphIterator;
 use crate::id_prefix::{IdIndex, IdIndexSource, IdIndexSourceEntry};
 use crate::index::{HexPrefix, PrefixResolution};
@@ -857,7 +857,7 @@ fn has_diff_from_parent(
 mod tests {
     use super::*;
     use crate::backend::{ChangeId, CommitId, ObjectId};
-    use crate::default_index_store::DefaultMutableIndex;
+    use crate::default_index::DefaultMutableIndex;
 
     /// Generator of unique 16-byte ChangeId excluding root id
     fn change_id_generator() -> impl FnMut() -> ChangeId {

lib/src/default_revset_graph_iterator.rs

@@ -18,7 +18,7 @@ use std::cmp::{min, Ordering};
 use std::collections::{BTreeMap, HashSet};
 
 use crate::backend::CommitId;
-use crate::default_index_store::{CompositeIndex, IndexEntry, IndexPosition};
+use crate::default_index::{CompositeIndex, IndexEntry, IndexPosition};
 use crate::revset_graph::{RevsetGraphEdge, RevsetGraphEdgeType};
 
 /// Like `RevsetGraphEdge`, but stores `IndexPosition` instead.

lib/src/lib.rs

@@ -25,7 +25,7 @@ pub mod commit;
 pub mod commit_builder;
 pub mod conflicts;
 pub mod dag_walk;
-pub mod default_index_store;
+pub mod default_index;
 pub mod default_revset_engine;
 pub mod default_revset_graph_iterator;
 pub mod default_submodule_store;

lib/src/repo.rs

@@ -35,7 +35,7 @@ use crate::backend::{
 };
 use crate::commit::{Commit, CommitByCommitterTimestamp};
 use crate::commit_builder::CommitBuilder;
-use crate::default_index_store::DefaultIndexStore;
+use crate::default_index::DefaultIndexStore;
 use crate::default_submodule_store::DefaultSubmoduleStore;
 use crate::file_util::{IoResultExt as _, PathError};
 use crate::git_backend::GitBackend;

lib/tests/test_default_revset_graph_iterator.rs

@@ -14,7 +14,7 @@
 
 use itertools::Itertools;
 use jj_lib::commit::Commit;
-use jj_lib::default_index_store::DefaultReadonlyIndex;
+use jj_lib::default_index::DefaultReadonlyIndex;
 use jj_lib::default_revset_engine::{evaluate, RevsetImpl};
 use jj_lib::repo::{ReadonlyRepo, Repo as _};
 use jj_lib::revset::ResolvedExpression;

lib/tests/test_index.rs

@@ -17,7 +17,7 @@ use std::sync::Arc;
 use jj_lib::backend::CommitId;
 use jj_lib::commit::Commit;
 use jj_lib::commit_builder::CommitBuilder;
-use jj_lib::default_index_store::{
+use jj_lib::default_index::{
     CompositeIndex, DefaultMutableIndex, DefaultReadonlyIndex, IndexPosition,
 };
 use jj_lib::index::Index as _;