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openidea/templates/theme-plugin/README.md
Jaw 55836e1b49 chore: Format the codebase with oxfmt and check formatting in CI (#135)
Run oxfmt once over the whole repository (formatting only, no logic changes) and add `pnpm format:check` to the frontend CI job so unformatted code no longer builds up. `.oxfmtrc.json` now skips the generated theme docs, test fixtures and code blocks inside Markdown.

Co-authored-by: jaw52 <53564781+jaw52@users.noreply.github.com>
2026-10-28 19:35:16 +08:00

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# Theme plugin template
A complete OpenIDEA theme plugin with one worked example, **Harbor Night**: a
dark theme with slate surfaces, a teal accent and a warm syntax palette. Copy
this folder to start your own theme. Full documentation, the token reference
and porting guides are in [`docs/plugins/themes.md`](../../docs/plugins/themes.md).
```
theme-plugin/
├─ plugin.toml # manifest: id, name, version, the theme files
└─ themes/
├─ harbor-night.theme.json # UI colours, every themeable token, grouped like tokens.css
└─ harbor-night.scheme.json # editor colour scheme: syntax, editor, ANSI colours
```
A theme plugin is data only: no code, no WebAssembly, no build step.
## Make your own
1. Copy the folder, for example to `~/openidea-themes/theme-my-theme`.
2. In `plugin.toml`, change `id` (lowercase, `a-z 0-9 - _`), `name`,
`description`, `authors` and the two paths.
3. Rename the theme files. In the theme file, set `id`, `name` and `kind`
(`"dark"` or `"light"`, the built-in base for anything you leave out).
4. Edit the colours. Each key is a CSS variable from `src/styles/tokens.css`,
and the reference in the docs gives the Islands Dark and Light values.
Comments (`//`, `/* */`) are allowed. Delete a line to keep the built-in value.
Porting an IntelliJ theme? `pnpm theme:import-intellij <file.theme.json> [file.icls] --out <dir>`
in the OpenIDEA repository generates a package in this layout.
## Package and install
The folder is the package. To share it, publish the folder as a Git repository
or a zip that users extract.
1. In OpenIDEA open **Settings › Plugins**, click the gear menu and choose
**Install Plugin from Disk…** (or run the _Install Plugin from Disk…_
action), then pick the folder that contains `plugin.toml`.
2. Select the plugin in the _Installed_ tab and press **Apply** next to the theme.
3. **Use Default Theme** in the same place goes back to the built-in theme.
## Iterate
Put (or symlink) the folder in `<project>/.openidea/plugins/` of an open
project. It loads as a _dev_ plugin, and **Reload** in Settings › Plugins (or
the _Reload Plugins_ action) re-reads your edits without reinstalling. Invalid
JSON or values are reported in Settings › Plugins with the file and line.
## Licence
The template and Harbor Night are part of OpenIDEA (Apache-2.0). When you port
someone else's theme, keep its licence and credit its authors.