Implement but undo

Author: krlvi

crates/but/src/args.rs

@@ -95,6 +95,8 @@ For examples see `but rub --help`."
         /// Oplog SHA to restore to
         oplog_sha: String,
     },
+    /// Undo the last operation by reverting to the previous snapshot.
+    Undo,
     /// Starts up the MCP server.
     Mcp {
         /// Starts the internal MCP server which has more granular tools.
@@ -138,6 +140,8 @@ pub enum CommandName {
     Oplog,
     #[clap(alias = "restore")]
     Restore,
+    #[clap(alias = "undo")]
+    Undo,
     BaseCheck,
     BaseUpdate,
     BranchNew,

crates/but/src/main.rs

@@ -183,6 +183,11 @@ async fn main() -> Result<()> {
             metrics_if_configured(app_settings, CommandName::Restore, props(start, &result)).ok();
             result
         }
+        Subcommands::Undo => {
+            let result = oplog::undo_last_operation(&args.current_dir, args.json);
+            metrics_if_configured(app_settings, CommandName::Undo, props(start, &result)).ok();
+            result
+        }
         Subcommands::Init { repo } => init::repo(&args.current_dir, args.json, *repo)
             .context("Failed to initialize GitButler project."),
     }

crates/but/src/oplog/mod.rs

@@ -196,3 +196,54 @@ pub(crate) fn restore_to_oplog(
 
     Ok(())
 }
+
+pub(crate) fn undo_last_operation(repo_path: &Path, _json: bool) -> anyhow::Result<()> {
+    let project = Project::find_by_path(repo_path)?;
+
+    // Get the last two snapshots - restore to the second one back
+    let snapshots = but_api::undo::list_snapshots(project.id, 2, None, None)?;
+
+    if snapshots.len() < 2 {
+        println!("{}", "No previous operations to undo.".yellow());
+        return Ok(());
+    }
+
+    let target_snapshot = &snapshots[1];
+
+    let target_operation = target_snapshot
+        .details
+        .as_ref()
+        .map(|d| d.title.as_str())
+        .unwrap_or("Unknown operation");
+
+    let target_time = chrono::DateTime::from_timestamp(target_snapshot.created_at.seconds(), 0)
+        .ok_or(anyhow::anyhow!("Could not parse timestamp"))?
+        .format("%Y-%m-%d %H:%M:%S")
+        .to_string();
+
+    println!("{}", "Undoing operation...".blue().bold());
+    println!(
+        "  Reverting to: {} ({})",
+        target_operation.green(),
+        target_time.dimmed()
+    );
+
+    // Restore to the previous snapshot using the but_api
+    but_api::undo::restore_snapshot(project.id, target_snapshot.commit_id.to_string())?;
+
+    let restore_commit_short = format!(
+        "{}{}",
+        &target_snapshot.commit_id.to_string()[..7]
+            .blue()
+            .underline(),
+        &target_snapshot.commit_id.to_string()[7..12].blue().dimmed()
+    );
+
+    println!(
+        "{} Undo completed successfully! Restored to snapshot: {}",
+        "✓".green().bold(),
+        restore_commit_short
+    );
+
+    Ok(())
+}