add default log revset configuration setting

CHANGELOG.md

@@ -24,6 +24,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * (#250) `jj log` now defaults to showing only commits that are not on any
   remote branches (plus their closest commit on the remote branch for context).
+  This set of commits can be overridden by setting `ui.default-revset`.
   Use `jj log -r 'all()'` for the old behavior. Read more about revsets
   [here](https://github.com/martinvonz/jj/blob/main/docs/revsets.md).
 

lib/src/settings.rs

@@ -79,6 +79,12 @@ impl UserSettings {
             .unwrap_or_else(|_| "push-".to_string())
     }
 
+    pub fn default_revset(&self) -> String {
+        self.config
+            .get_string("ui.default-revset")
+            .unwrap_or_else(|_| "remote_branches().. | (remote_branches()..)-".to_string())
+    }
+
     pub fn signature(&self) -> Signature {
         let timestamp = self.timestamp.clone().unwrap_or_else(Timestamp::now);
         Signature {

src/commands.rs

@@ -262,13 +262,10 @@ struct StatusArgs {}
 /// Show commit history
 #[derive(clap::Args, Clone, Debug)]
 struct LogArgs {
-    /// Which revisions to show
-    #[arg(
-        long,
-        short,
-        default_value = "remote_branches().. | (remote_branches()..)-"
-    )]
-    revisions: String,
+    /// Which revisions to show. Defaults to the `ui.default-revset` setting,
+    /// or "remote_branches().. | (remote_branches()..)-" if it is not set.
+    #[arg(long, short)]
+    revisions: Option<String>,
     /// Show commits modifying the given paths
     #[arg(value_hint = clap::ValueHint::AnyPath)]
     paths: Vec<String>,
@@ -2082,7 +2079,8 @@ fn log_template(settings: &UserSettings) -> String {
 fn cmd_log(ui: &mut Ui, command: &CommandHelper, args: &LogArgs) -> Result<(), CommandError> {
     let workspace_command = command.workspace_helper(ui)?;
 
-    let revset_expression = revset::parse(&args.revisions)?;
+    let default_revset = ui.settings().default_revset();
+    let revset_expression = revset::parse(args.revisions.as_ref().unwrap_or(&default_revset))?;
     let repo = workspace_command.repo();
     let workspace_id = workspace_command.workspace_id();
     let checkout_id = repo.view().get_wc_commit_id(&workspace_id);

tests/test_log_command.rs

@@ -198,3 +198,30 @@ fn test_log_filtered_by_path() {
     A file2
     "###);
 }
+
+#[test]
+fn test_default_revset() {
+    let test_env = TestEnvironment::default();
+    test_env.jj_cmd_success(test_env.env_root(), &["init", "repo", "--git"]);
+    let repo_path = test_env.env_root().join("repo");
+
+    std::fs::write(repo_path.join("file1"), "foo\n").unwrap();
+    test_env.jj_cmd_success(&repo_path, &["describe", "-m", "add a file"]);
+
+    // Set configuration to only show the root commit.
+    test_env.add_config(
+        br#"[ui]
+        default-revset = "root"
+        "#,
+    );
+
+    // Log should only contain one line (for the root commit), and not show the
+    // commit created above.
+    assert_eq!(
+        1,
+        test_env
+            .jj_cmd_success(&repo_path, &["log", "-T", "commit_id"])
+            .lines()
+            .count()
+    );
+}