revset: extract graph-related types to separate module

I'm going to add a topo-grouping iterator adapter, and the revset module is
already big enough to split.

lib/src/default_revset_engine.rs

@@ -34,8 +34,9 @@ use crate::matchers::{EverythingMatcher, Matcher, PrefixMatcher, Visit};
 use crate::repo_path::RepoPath;
 use crate::revset::{
     ChangeIdIndex, ResolvedExpression, ResolvedPredicateExpression, Revset, RevsetEvaluationError,
-    RevsetFilterPredicate, RevsetGraphEdge, GENERATION_RANGE_FULL,
+    RevsetFilterPredicate, GENERATION_RANGE_FULL,
 };
+use crate::revset_graph::RevsetGraphEdge;
 use crate::rewrite;
 use crate::store::Store;
 

lib/src/default_revset_graph_iterator.rs

@@ -19,7 +19,7 @@ use std::collections::{BTreeMap, HashSet};
 
 use crate::backend::CommitId;
 use crate::default_index_store::{IndexEntry, IndexPosition};
-use crate::revset::{RevsetGraphEdge, RevsetGraphEdgeType};
+use crate::revset_graph::{RevsetGraphEdge, RevsetGraphEdgeType};
 
 /// Given an iterator over some set of revisions, yields the same revisions with
 /// associated edge types.

lib/src/lib.rs

@@ -52,6 +52,7 @@ pub mod refs;
 pub mod repo;
 pub mod repo_path;
 pub mod revset;
+pub mod revset_graph;
 pub mod rewrite;
 pub mod settings;
 pub mod simple_op_heads_store;

lib/src/revset.rs

@@ -39,6 +39,7 @@ use crate::index::{HexPrefix, PrefixResolution};
 use crate::op_store::WorkspaceId;
 use crate::repo::Repo;
 use crate::repo_path::{FsPathParseError, RepoPath};
+use crate::revset_graph::RevsetGraphEdge;
 use crate::store::Store;
 
 /// Error occurred during symbol resolution.
@@ -2158,40 +2159,6 @@ pub trait ChangeIdIndex: Send + Sync {
     fn shortest_unique_prefix_len(&self, change_id: &ChangeId) -> usize;
 }
 
-#[derive(Debug, PartialEq, Eq, Clone, Hash)]
-pub struct RevsetGraphEdge {
-    pub target: CommitId,
-    pub edge_type: RevsetGraphEdgeType,
-}
-
-impl RevsetGraphEdge {
-    pub fn missing(target: CommitId) -> Self {
-        Self {
-            target,
-            edge_type: RevsetGraphEdgeType::Missing,
-        }
-    }
-    pub fn direct(target: CommitId) -> Self {
-        Self {
-            target,
-            edge_type: RevsetGraphEdgeType::Direct,
-        }
-    }
-    pub fn indirect(target: CommitId) -> Self {
-        Self {
-            target,
-            edge_type: RevsetGraphEdgeType::Indirect,
-        }
-    }
-}
-
-#[derive(Debug, PartialEq, Eq, Clone, Hash)]
-pub enum RevsetGraphEdgeType {
-    Missing,
-    Direct,
-    Indirect,
-}
-
 pub trait RevsetIteratorExt<'index, I> {
     fn commits(self, store: &Arc<Store>) -> RevsetCommitIterator<I>;
     fn reversed(self) -> ReverseRevsetIterator;
@@ -2247,46 +2214,6 @@ pub struct RevsetWorkspaceContext<'a> {
     pub workspace_root: &'a Path,
 }
 
-pub struct ReverseRevsetGraphIterator {
-    items: Vec<(CommitId, Vec<RevsetGraphEdge>)>,
-}
-
-impl ReverseRevsetGraphIterator {
-    pub fn new<'revset>(
-        input: Box<dyn Iterator<Item = (CommitId, Vec<RevsetGraphEdge>)> + 'revset>,
-    ) -> Self {
-        let mut entries = vec![];
-        let mut reverse_edges: HashMap<CommitId, Vec<RevsetGraphEdge>> = HashMap::new();
-        for (commit_id, edges) in input {
-            for RevsetGraphEdge { target, edge_type } in edges {
-                reverse_edges
-                    .entry(target)
-                    .or_default()
-                    .push(RevsetGraphEdge {
-                        target: commit_id.clone(),
-                        edge_type,
-                    })
-            }
-            entries.push(commit_id);
-        }
-
-        let mut items = vec![];
-        for commit_id in entries.into_iter() {
-            let edges = reverse_edges.get(&commit_id).cloned().unwrap_or_default();
-            items.push((commit_id, edges));
-        }
-        Self { items }
-    }
-}
-
-impl Iterator for ReverseRevsetGraphIterator {
-    type Item = (CommitId, Vec<RevsetGraphEdge>);
-
-    fn next(&mut self) -> Option<Self::Item> {
-        self.items.pop()
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;

lib/src/revset_graph.rs

@@ -0,0 +1,95 @@
+// Copyright 2021-2023 The Jujutsu Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#![allow(missing_docs)]
+
+use std::collections::HashMap;
+
+use crate::backend::CommitId;
+
+#[derive(Debug, PartialEq, Eq, Clone, Hash)]
+pub struct RevsetGraphEdge {
+    pub target: CommitId,
+    pub edge_type: RevsetGraphEdgeType,
+}
+
+impl RevsetGraphEdge {
+    pub fn missing(target: CommitId) -> Self {
+        Self {
+            target,
+            edge_type: RevsetGraphEdgeType::Missing,
+        }
+    }
+
+    pub fn direct(target: CommitId) -> Self {
+        Self {
+            target,
+            edge_type: RevsetGraphEdgeType::Direct,
+        }
+    }
+
+    pub fn indirect(target: CommitId) -> Self {
+        Self {
+            target,
+            edge_type: RevsetGraphEdgeType::Indirect,
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Eq, Clone, Hash)]
+pub enum RevsetGraphEdgeType {
+    Missing,
+    Direct,
+    Indirect,
+}
+
+pub struct ReverseRevsetGraphIterator {
+    items: Vec<(CommitId, Vec<RevsetGraphEdge>)>,
+}
+
+impl ReverseRevsetGraphIterator {
+    pub fn new<'revset>(
+        input: Box<dyn Iterator<Item = (CommitId, Vec<RevsetGraphEdge>)> + 'revset>,
+    ) -> Self {
+        let mut entries = vec![];
+        let mut reverse_edges: HashMap<CommitId, Vec<RevsetGraphEdge>> = HashMap::new();
+        for (commit_id, edges) in input {
+            for RevsetGraphEdge { target, edge_type } in edges {
+                reverse_edges
+                    .entry(target)
+                    .or_default()
+                    .push(RevsetGraphEdge {
+                        target: commit_id.clone(),
+                        edge_type,
+                    })
+            }
+            entries.push(commit_id);
+        }
+
+        let mut items = vec![];
+        for commit_id in entries.into_iter() {
+            let edges = reverse_edges.get(&commit_id).cloned().unwrap_or_default();
+            items.push((commit_id, edges));
+        }
+        Self { items }
+    }
+}
+
+impl Iterator for ReverseRevsetGraphIterator {
+    type Item = (CommitId, Vec<RevsetGraphEdge>);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.items.pop()
+    }
+}

lib/tests/test_default_revset_graph_iterator.rs

@@ -17,7 +17,8 @@ use jj_lib::commit::Commit;
 use jj_lib::default_index_store::ReadonlyIndexWrapper;
 use jj_lib::default_revset_engine::{evaluate, RevsetImpl};
 use jj_lib::repo::{ReadonlyRepo, Repo as _};
-use jj_lib::revset::{ResolvedExpression, RevsetGraphEdge};
+use jj_lib::revset::ResolvedExpression;
+use jj_lib::revset_graph::RevsetGraphEdge;
 use test_case::test_case;
 use testutils::{CommitGraphBuilder, TestRepo};
 

lib/tests/test_revset.rs

@@ -30,10 +30,10 @@ use jj_lib::op_store::{BranchTarget, RefTarget, WorkspaceId};
 use jj_lib::repo::Repo;
 use jj_lib::repo_path::RepoPath;
 use jj_lib::revset::{
-    optimize, parse, DefaultSymbolResolver, ReverseRevsetGraphIterator, Revset, RevsetAliasesMap,
-    RevsetExpression, RevsetFilterPredicate, RevsetGraphEdge, RevsetResolutionError,
-    RevsetWorkspaceContext, SymbolResolver as _,
+    optimize, parse, DefaultSymbolResolver, Revset, RevsetAliasesMap, RevsetExpression,
+    RevsetFilterPredicate, RevsetResolutionError, RevsetWorkspaceContext, SymbolResolver as _,
 };
+use jj_lib::revset_graph::{ReverseRevsetGraphIterator, RevsetGraphEdge};
 use jj_lib::settings::GitSettings;
 use jj_lib::tree::merge_trees;
 use jj_lib::workspace::Workspace;

src/commands/mod.rs

@@ -41,9 +41,9 @@ use jj_lib::op_store::WorkspaceId;
 use jj_lib::repo::{ReadonlyRepo, Repo};
 use jj_lib::repo_path::RepoPath;
 use jj_lib::revset::{
-    ReverseRevsetGraphIterator, RevsetAliasesMap, RevsetExpression, RevsetFilterPredicate,
-    RevsetGraphEdge, RevsetGraphEdgeType, RevsetIteratorExt,
+    RevsetAliasesMap, RevsetExpression, RevsetFilterPredicate, RevsetIteratorExt,
 };
+use jj_lib::revset_graph::{ReverseRevsetGraphIterator, RevsetGraphEdge, RevsetGraphEdgeType};
 use jj_lib::rewrite::{back_out_commit, merge_commit_trees, rebase_commit, DescendantRebaser};
 use jj_lib::settings::UserSettings;
 use jj_lib::tree::{merge_trees, Tree};