fix(revset): support builtin immutable-head aliases (#61)

Author: hewigovens

crates/jayjay-core/src/dag.rs

@@ -116,17 +116,15 @@ fn assign_lane(
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::types::{ChangeInfo, GraphEdge};
+    use crate::types::{ChangeInfo, CommitAuthor, GraphEdge};
 
     fn entry(commit_id: &str, parents: &[&str]) -> GraphEntry {
         GraphEntry {
             change: ChangeInfo {
                 change_id: format!("change-{commit_id}"),
                 commit_id: commit_id.to_owned(),
                 description: String::new(),
-                author: String::new(),
-                email: String::new(),
-                timestamp_millis: 0,
+                author: CommitAuthor::empty(0),
                 parents: parents.iter().map(|s| (*s).to_owned()).collect(),
                 bookmarks: Vec::new(),
                 is_working_copy: false,

crates/jayjay-core/src/repo/mod.rs

@@ -122,11 +122,11 @@ impl Repo {
     }
 
     pub(crate) fn commit_transaction(&self, tx: Transaction, description: &str) -> CoreResult<()> {
-        let old_wc_id = self.current_wc_commit_id();
+        let old_working_copy_commit_id = self.current_wc_commit_id();
         let new_repo = self.commit_transaction_to_repo(tx, description)?;
         self.set_repo(new_repo);
         // If @ changed, sync the working directory on disk
-        if self.current_wc_commit_id() != old_wc_id {
+        if self.current_wc_commit_id() != old_working_copy_commit_id {
             self.check_out_current_working_copy("sync working copy after transaction")?;
         }
         Ok(())