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openproject/frontend/doc/PLUGINS.md

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Rails plugins with Frontends
====================
OpenProject Community Edition has some plugins that contain a frontend,
e.g., [Costs](https://github.com/finnlabs/openproject-costs/) or [My Project Page](https://github.com/finnlabs/openproject-my_project_page/).
For developing these plugins, they need to be linked so either the Legacy or Angular frontend can see and process them.
## Installing a Plugin
To install a plugin, you clone it locally and place it into your `Gemfile.plugins` like so:
```
group :opf_plugins do
gem 'openproject-costs', path: '../plugins/openproject-costs'
end
```
After that you first need to bundle the application with `bundle install`.
The plugin is now known in the OpenProject application, but their frontends are not linked. For development, before you run any `webpack` or `CLI` commands, execute this rake task:
```
./bin/rake openproject:plugins:register_frontend
```
This will ensure those plugins with a frontend are symlinked to `frontend/src/app/modules/plugins/linked/` for plugins with an exported Angular module under `frontend/module/main.ts`.
### Example: OpenProject Costs plugin
The [Costs](https://github.com/finnlabs/openproject-costs/) plugin has both legacy components that are still used by Rails templates as well as an entry module file to register to the Angular frontend.
Let's take a look at the file structure of the costs folder `frontend/`:
```
module
├── main.ts
└── wp-display
├── costs-by-type-display-field.module.ts
└── currency-display-field.module.ts
```
The Angular frontend entry point is `frontend/module/main.ts` and should export a `PluginModule` ngModule that looks like the following:
```typescript
export function initializeCostsPlugin() {
return () => {
window.OpenProject.getPluginContext()
.then((pluginContext:OpenProjectPluginContext) => {
// Register a field type to the core EditField functionality
pluginContext.services.editField.extendFieldType('select', ['Budget']);
// Register a hook callback for a specific core hook
pluginContext.hooks.workPackageSingleContextMenu(function(params:any) {
return {
key: 'log_costs',
icon: 'icon-projects',
indexBy: function(actions:any) {
var index = _.findIndex(actions, {key: 'log_time'});
return index !== -1 ? index + 1 : actions.length;
},
resource: 'workPackage',
link: 'logCosts'
};
});
});
};
}
@NgModule({
providers: [
{ provide: APP_INITIALIZER, useFactory: initializeCostsPlugin, deps: [Injector], multi: true },
],
})
export class PluginModule { // The name PluginModule is important!
}
```
The rake task will generate a Module under `frontend/src/app/modules/plugins/linked-plugin-module.ts` that will import all these plugin modules. This happens by filling an ERB template by the rake task and is performed in `lib/open_project/plugins/frontend_linking/*`