feat: unify structured error output

tests/test_cli.py

@@ -55,6 +55,22 @@ def test_cli_commands_wrap_client_creation_errors(monkeypatch, args) -> None:
     assert type(result.exception).__name__ == "SystemExit"
 
 
+def test_cli_user_error_yaml(monkeypatch) -> None:
+    monkeypatch.setenv("OUTPUT", "auto")
+    monkeypatch.setattr(
+        "twitter_cli.cli._get_client",
+        lambda config=None: (_ for _ in ()).throw(RuntimeError("User not found")),
+    )
+    runner = CliRunner()
+
+    result = runner.invoke(cli, ["user", "alice", "--yaml"])
+
+    assert result.exit_code == 1
+    payload = yaml.safe_load(result.output)
+    assert payload["ok"] is False
+    assert payload["error"]["code"] == "api_error"
+
+
 def test_cli_tweet_accepts_shared_url_with_query(monkeypatch) -> None:
     class FakeClient:
         def fetch_tweet_detail(self, tweet_id: str, max_count: int):

twitter_cli/cli.py

@@ -52,6 +52,7 @@ from .formatter import (
 from .models import UserProfile
 from .output import (
     default_structured_format,
+    emit_error,
     emit_structured,
     error_payload,
     structured_output_options,
@@ -144,6 +145,8 @@ def _get_client_for_output(config=None, quiet=False):
 
 def _exit_with_error(exc):
     # type: (RuntimeError) -> None
+    if emit_error("api_error", str(exc)):
+        sys.exit(1)
     console.print("[red]❌ %s[/red]" % exc)
     sys.exit(1)
 

twitter_cli/output.py

@@ -99,3 +99,30 @@ def _normalize_success_payload(data: Any) -> Any:
     if isinstance(data, dict) and data.get("schema_version") == _SCHEMA_VERSION and "ok" in data:
         return data
     return success_payload(data)
+
+
+def emit_error(
+    code: str,
+    message: str,
+    *,
+    as_json: bool | None = None,
+    as_yaml: bool | None = None,
+    details: Any | None = None,
+) -> bool:
+    """Emit a structured error when the active output mode is machine-readable."""
+    if as_json is None or as_yaml is None:
+        ctx = click.get_current_context(silent=True)
+        params = ctx.params if ctx is not None else {}
+        as_json = bool(params.get("as_json", False)) if as_json is None else as_json
+        as_yaml = bool(params.get("as_yaml", False)) if as_yaml is None else as_yaml
+
+    fmt = default_structured_format(as_json=bool(as_json), as_yaml=bool(as_yaml))
+    if fmt is None:
+        return False
+
+    payload = error_payload(code, message, details=details)
+    if fmt == "json":
+        click.echo(json.dumps(payload, ensure_ascii=False, indent=2))
+    else:
+        click.echo(yaml.safe_dump(payload, allow_unicode=True, sort_keys=False, default_flow_style=False))
+    return True