feat: marimo run directory #4961
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mscolnick
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Jan 30, 2026
## 📝 Summary Enables running multiple marimo notebook files as a gallery of apps in the below style: ```shell marimo run folder marimo run folder another_folder marimo run file_a.py file_b.py folder ``` When pointed to a local clone of https://github.com/marimo-team/learn this gives us: <img width="1047" height="983" alt="Screenshot 2026-01-29 at 19 24 02" src="https://github.com/user-attachments/assets/bb6b949c-52f8-4e34-b675-8628e22e0dc4" /> Closes #3257 ## 🔍 Description of Changes I based this work on #4961, borrowing the idea of reusing the existing home page infrastructure used in `marimo edit` mode and adding `gallery` as a new frontend view in `marimo run` mode. - Gallery item links are encoded through `/?file=<encoded>` to avoid introducing new routing / mounting logic - Navigation is restricted so that we don't accept arbitrary `/?file=<encoded>` values - extended `marimo._server.file_router.ListOfFilesAppFileRouter` to behave like an allowlist router - Preserved existing `marimo run app.py -- --arg value` behavior working while enabling `marimo run file_a.py file_b.py folder` and still allowing notebook args to be explicitly separated - Added a root directory heuristic for nicer URLs and less path leakage (via `marimo._cli.cli.py._resolve_root_dir`) - e.g. if I run `uv run marimo run /Users/petergy/Projects/opensource/marimo-team/learn`. the `learn` repo is recognized as gallery root, so opening `/Users/petergy/Projects/opensource/marimo-team/learn/functional_programming/05_functors.py` will be available under `http://localhost:2720/?file=functional_programming%2F05_functors.py` - Gallery entries have auto-generated `title` and `subtitle` for now (notebook dir and file name piped through `titleCase`) ## TODO before undrafting this - define `--sandbox` semantics - per-notebook or per-gallery venv? - should we create sandbox eagerly (we create all the venvs at cmd execution time) or lazily (create venv only on notebook visit)? ## 📋 Checklist - [x] I have read the [contributor guidelines](https://github.com/marimo-team/marimo/blob/main/CONTRIBUTING.md). - [x] For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on [Discord](https://marimo.io/discord?ref=pr), or the community [discussions](https://github.com/marimo-team/marimo/discussions) (Please provide a link if applicable). - [x] Tests have been added for the changes made. - [x] Documentation has been updated where applicable, including docstrings for API changes. - [x] Pull request title is a good summary of the changes - it will be used in the [release notes](https://github.com/marimo-team/marimo/releases). --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
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