PlantUML (Rust) for VS Code
Renders PlantUML locally, with no Java, no Graphviz process and no network: the extension bundles a wasm build
of plantuml-core.
.puml preview: use PlantUML: Open Preview from the Command Palette, editor title menu, or
editor context menu. It opens a side panel for the active document and updates as you type.- Syntax highlighting for
.puml, .plantuml, .iuml and .pu, with comment toggling and bracket
matching (syntaxes/plantuml.tmLanguage.json, language-configuration.json).
- PlantUML: Export SVG writes the current diagram to a
.svg next to the document.
- Markdown:
puml / plantuml / ```uml fenced blocks render inside VS Code's built-in Markdown preview
(contributed through markdown.markdownItPlugins).
- A diagram the port cannot render is shown as a red message box with the error, instead of failing silently.
Build and test
The wasm package is generated, not committed:
../..//scripts/build-vscode-ext.sh # cargo build + wasm-bindgen --target nodejs -> wasm/
npm install && npm test # renders diagrams and the markdown fences in Node
Open the folder in VS Code and press F5 to launch an Extension Development Host.
Package and publish
../../scripts/build-vscode-ext.sh -p # wasm + npm install + vsce package -> plantuml-rs.vsix
npx @vscode/vsce publish # needs the publisher id below and a PAT
Publishing is manual: log in with vsce login bjornharrtell, then npx @vscode/vsce publish --packagePath plantuml-rs.vsix. For Open VSX use npx ovsx publish plantuml-rs.vsix -p <token>. The version in
package.json follows the crate version: chore(release) bumps all of them together.
The extension has no runtime dependencies: markdown-it is only a dev dependency for the tests.
