issue_comments: 732543700

Current design: https://docs.datasette.io/en/stable/plugin_hooks.html#register-output-renderer-datasette

python @hookimpl def register_output_renderer(datasette): return { "extension": "test", "render": render_demo, "can_render": can_render_demo, # Optional } Where render_demo looks something like this: python async def render_demo(datasette, columns, rows): db = datasette.get_database() result = await db.execute("select sqlite_version()") first_row = " | ".join(columns) lines = [first_row] lines.append("=" * len(first_row)) for row in rows: lines.append(" | ".join(row)) return Response( "\n".join(lines), content_type="text/plain; charset=utf-8", headers={"x-sqlite-version": result.first()[0]} ) Meanwhile here's where the CSV streaming mode is implemented: https://github.com/simonw/datasette/blob/4bac9f18f9d04e5ed10f072502bcc508e365438e/datasette/views/base.py#L297-L380