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l0ng-aiтаDeng Liu 900f2e6819 feat(plugins): web views, document bridge and the Excalidraw official plugin
Plugins can now ship a web page as the UI of a view or custom editor
(`web = "web/index.html"`), so editors built on web libraries are plugins
rather than part of the core.

- Web views: every file under the page's directory is part of the package
  (checked, copied on install, covered by the digest and signature) and
  served through the `openidea-plugin` URL scheme, under a per-revision
  path with a CSP of its own, into an `<iframe sandbox="allow-scripts">`.
  An update or reinstall reloads open pages.
- Frame bridge (`window.openidea`), shared by html bodies and web pages:
  theme, messages to the plugin's code, `document.get/edit/replace/onChange`
  (versioned edits that join the text editor's undo history, Save and dirty
  state), `saveFile`/`openFile` through the IDE's dialogs, and IDE shortcuts
  the page leaves alone.
- Custom editor layouts: tab, split (Editor and X) or preview over the text
  editor, switchable from the tab's actions.
- New points `fileIcons` and `fileTemplates`; new optional capability
  `clipboard` for web views.
- Excalidraw official plugin: `.excalidraw` / `.excalidraw.json` open as an
  interactive canvas kept in step with the file's text, with self-hosted
  fonts, PNG/SVG export, images, file icons, a New Drawing template and
  JSON highlighting. Closes #732.
- Fixes: a lock-order deadlock between listing plugins and refreshing
  project pins; the dev server ignored edits under `src/features/plugins`.
- `plugins/build.sh` builds and checks web pages; CI typechecks and tests
  them.

Co-authored-by: Deng Liu <[email protected]>
2026-11-04 02:41:46 +08:00

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# Third-party software
The page in `web/` is built from `web-src/` and bundles:
- **Excalidraw** (`@excalidraw/excalidraw` 0.18.1), MIT License, Copyright (c) 2020 Excalidraw —
https://github.com/excalidraw/excalidraw — with the libraries it loads on demand (among them
Mermaid, KaTeX and Cytoscape.js, MIT License).
- **React** and **React DOM**, MIT License, Copyright (c) Meta Platforms, Inc. and affiliates.
- The fonts Excalidraw ships in `web/fonts/` (Excalifont, Virgil, Xiaolai, Nunito, Lilita One,
Comic Shanns, Cascadia Code, Liberation Sans, Assistant), each under its own licence (SIL Open
Font License 1.1, or MIT for Comic Shanns); see the Excalidraw repository for their texts.
The MIT License:
> Permission is hereby granted, free of charge, to any person obtaining a copy of this software
> and associated documentation files (the "Software"), to deal in the Software without
> restriction, including without limitation the rights to use, copy, modify, merge, publish,
> distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
> Software is furnished to do so, subject to the following conditions:
>
> The above copyright notice and this permission notice shall be included in all copies or
> substantial portions of the Software.
>
> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
> BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
> NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.