feat: add autocomplete for session files

src/goose/cli/main.py

@@ -98,11 +98,26 @@ def session_start(profile: str, plan: Optional[str] = None) -> None:
     session.run()
 
 
+def autocomplete_session_files(ctx: click.Context, args: str, incomplete: str) -> None:
+    return [
+        f"{session_name}"
+        for session_name in sorted(get_session_files().keys(), reverse=True, key=lambda x: x.lower())
+        if session_name.startswith(incomplete)
+    ]
+
+
+def get_session_files() -> Dict[str, Path]:
+    return list_sorted_session_files(SESSIONS_PATH)
+
+
 @session.command(name="resume")
-@click.argument("name", required=False)
+@click.argument("name", required=False, shell_complete=autocomplete_session_files)
 @click.option("--profile")
 def session_resume(name: Optional[str], profile: str) -> None:
     """Resume an existing goose session"""
+    if name is not None:
+        click.echo(f"Resuming session: {name}")
+
     if name is None:
         session_files = get_session_files()
         if session_files:
@@ -132,10 +147,6 @@ def session_clear(keep: int) -> None:
             session_file.unlink()
 
 
-def get_session_files() -> Dict[str, Path]:
-    return list_sorted_session_files(SESSIONS_PATH)
-
-
 @click.group(
     invoke_without_command=True,
     name="goose",