templater: add local/remote_branches keywords

CHANGELOG.md

@@ -66,6 +66,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * The `branches`/`tags`/`git_refs`/`git_head` template keywords now return a
   list of `RefName`s. They were previously pre-formatted strings.
 
+* The new template keywords `local_branches`/`remote_branches` are added to show
+  only local/remote branches.
+
 ### Fixed bugs
 
 * Updating the working copy to a commit where a file that's currently ignored

cli/src/commit_templater.rs

@@ -320,6 +320,28 @@ fn build_commit_keyword_opt<'repo>(
                     .collect()
             }))
         }
+        "local_branches" => {
+            let index = cache.branches_index(repo).clone();
+            language.wrap_ref_name_list(wrap_fn(property, move |commit| {
+                index
+                    .get(commit.id())
+                    .iter()
+                    .filter(|ref_name| ref_name.is_local())
+                    .cloned()
+                    .collect()
+            }))
+        }
+        "remote_branches" => {
+            let index = cache.branches_index(repo).clone();
+            language.wrap_ref_name_list(wrap_fn(property, move |commit| {
+                index
+                    .get(commit.id())
+                    .iter()
+                    .filter(|ref_name| ref_name.is_remote())
+                    .cloned()
+                    .collect()
+            }))
+        }
         "tags" => {
             let index = cache.tags_index(repo).clone();
             language.wrap_ref_name_list(wrap_fn(property, move |commit| {
@@ -393,6 +415,10 @@ impl RefName {
     fn is_local(&self) -> bool {
         self.remote.is_none()
     }
+
+    fn is_remote(&self) -> bool {
+        self.remote.is_some()
+    }
 }
 
 impl Template<()> for RefName {

cli/tests/test_commit_template.rs

@@ -379,7 +379,7 @@ fn test_log_branches() {
     test_env.jj_cmd_ok(&origin_path, &["describe", "-m=description 1"]);
     test_env.jj_cmd_ok(&origin_path, &["branch", "create", "branch1"]);
     test_env.jj_cmd_ok(&origin_path, &["new", "root()", "-m=description 2"]);
-    test_env.jj_cmd_ok(&origin_path, &["branch", "create", "branch2"]);
+    test_env.jj_cmd_ok(&origin_path, &["branch", "create", "branch2", "unchanged"]);
     test_env.jj_cmd_ok(&origin_path, &["new", "root()", "-m=description 3"]);
     test_env.jj_cmd_ok(&origin_path, &["branch", "create", "branch3"]);
     test_env.jj_cmd_ok(&origin_path, &["git", "export"]);
@@ -417,7 +417,7 @@ fn test_log_branches() {
     │ ◉  21c33875443e branch1*
     ├─╯
     │ @  a5b4d15489cc branch2* new-branch
-    │ ◉  8476341eb395 branch2@origin
+    │ ◉  8476341eb395 branch2@origin unchanged
     ├─╯
     ◉  000000000000 (no branches)
     "###);
@@ -431,10 +431,24 @@ fn test_log_branches() {
     │ ◉  branch1
     ├─╯
     │ @  branch2, new-branch
-    │ ◉  origin/branch2
+    │ ◉  origin/branch2, unchanged
     ├─╯
     ◉
     "###);
+
+    let template = r#"separate(" ", "L:", local_branches, "R:", remote_branches)"#;
+    let output = test_env.jj_cmd_success(&workspace_root, &["log", "-T", template]);
+    insta::assert_snapshot!(output, @r###"
+    ◉  L: branch3?? R: branch3@origin
+    │ ◉  L: branch3?? R:
+    ├─╯
+    │ ◉  L: branch1* R:
+    ├─╯
+    │ @  L: branch2* new-branch R:
+    │ ◉  L: unchanged R: branch2@origin unchanged@origin
+    ├─╯
+    ◉  L: R:
+    "###);
 }
 
 #[test]

docs/templates.md

@@ -25,7 +25,11 @@ The following keywords can be used in `jj log`/`jj obslog` templates.
   working-copy commit as `<workspace name>@`.
 * `current_working_copy: Boolean`: True for the working-copy commit of the
   current workspace.
-* `branches: List<RefName>`
+* `branches: List<RefName>`: Local and remote branches pointing to the commit.
+  A tracking remote branch will be included only if its target is different
+  from the local one.
+* `local_branches: List<RefName>`: All local branches pointing to the commit.
+* `remote_branches: List<RefName>`: All remote branches pointing to the commit.
 * `tags: List<RefName>`
 * `git_refs: List<RefName>`
 * `git_head: List<RefName>`