revset: add working_copies() function

It includes the working copy commit of every workspace of the repo.

Implements #3384

CHANGELOG.md

@@ -63,6 +63,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * `jj split` now supports a `--siblings/-s` option that splits the target
   revision into siblings with the same parents and children.
 
+* new function `working_copies()` for revsets to show the working copy commits of all workspaces.
+
 ### Fixed bugs
 
 ## [0.15.1] - 2024-03-06

docs/revsets.md

@@ -171,6 +171,8 @@ given [string pattern](#string-patterns).
 * `present(x)`: Same as `x`, but evaluated to `none()` if any of the commits
   in `x` doesn't exist (e.g. is an unknown branch name.)
 
+* `working_copies()`: The working copy commits across all the workspaces.
+
 ## String patterns
 
 Functions that perform string matching support the following pattern syntax:

lib/src/revset.rs

@@ -275,6 +275,7 @@ pub const GENERATION_RANGE_EMPTY: Range<u64> = 0..0;
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub enum RevsetCommitRef {
     WorkingCopy(WorkspaceId),
+    WorkingCopies,
     Symbol(String),
     RemoteSymbol {
         name: String,
@@ -371,6 +372,10 @@ impl RevsetExpression {
         )))
     }
 
+    pub fn working_copies() -> Rc<RevsetExpression> {
+        Rc::new(RevsetExpression::CommitRef(RevsetCommitRef::WorkingCopies))
+    }
+
     pub fn symbol(value: String) -> Rc<RevsetExpression> {
         Rc::new(RevsetExpression::CommitRef(RevsetCommitRef::Symbol(value)))
     }
@@ -1157,6 +1162,10 @@ static BUILTIN_FUNCTION_MAP: Lazy<HashMap<&'static str, RevsetFunction>> = Lazy:
         expect_no_arguments(name, arguments_pair)?;
         Ok(RevsetExpression::all())
     });
+    map.insert("working_copies", |name, arguments_pair, _state| {
+        expect_no_arguments(name, arguments_pair)?;
+        Ok(RevsetExpression::working_copies())
+    });
     map.insert("heads", |name, arguments_pair, state| {
         let arg = expect_one_argument(name, arguments_pair)?;
         let candidates = parse_expression_rule(arg.into_inner(), state)?;
@@ -2139,6 +2148,10 @@ fn resolve_commit_ref(
                 })
             }
         }
+        RevsetCommitRef::WorkingCopies => {
+            let wc_commits = repo.view().wc_commit_ids().values().cloned().collect_vec();
+            Ok(wc_commits)
+        }
         RevsetCommitRef::VisibleHeads => Ok(repo.view().heads().iter().cloned().collect_vec()),
         RevsetCommitRef::Root => Ok(vec![repo.store().root_commit_id().clone()]),
         RevsetCommitRef::Branches(pattern) => {

lib/tests/test_revset.rs

@@ -371,6 +371,41 @@ fn test_resolve_working_copy() {
     assert_eq!(resolve(ws2), vec![commit2.id().clone()]);
 }
 
+#[test]
+fn test_resolve_working_copies() {
+    let settings = testutils::user_settings();
+    let test_repo = TestRepo::init();
+    let repo = &test_repo.repo;
+
+    let mut tx = repo.start_transaction(&settings);
+    let mut_repo = tx.mut_repo();
+
+    let commit1 = write_random_commit(mut_repo, &settings);
+    let commit2 = write_random_commit(mut_repo, &settings);
+
+    // Add some workspaces
+    let ws1 = WorkspaceId::new("ws1".to_string());
+    let ws2 = WorkspaceId::new("ws2".to_string());
+
+    // add one commit to each working copy
+    mut_repo
+        .set_wc_commit(ws1.clone(), commit1.id().clone())
+        .unwrap();
+    mut_repo
+        .set_wc_commit(ws2.clone(), commit2.id().clone())
+        .unwrap();
+    let resolve = || -> Vec<CommitId> {
+        RevsetExpression::working_copies()
+            .evaluate_programmatic(mut_repo)
+            .unwrap()
+            .iter()
+            .collect()
+    };
+
+    // ensure our output has those two commits
+    assert_eq!(resolve(), vec![commit2.id().clone(), commit1.id().clone()]);
+}
+
 #[test]
 fn test_resolve_symbol_branches() {
     let settings = testutils::user_settings();