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							- // @flow
 - 
 - import { toState } from '../base/redux';
 - 
 - const ETHERPAD_OPTIONS = {
 -     showControls: 'true',
 -     showChat: 'false',
 -     showLineNumbers: 'true',
 -     useMonospaceFont: 'false'
 - };
 - 
 - /**
 -  * Retrieves the current sahred document URL.
 -  *
 -  * @param {Function|Object} stateful - The redux store or {@code getState} function.
 -  * @returns {?string} - Current shared document URL or undefined.
 -  */
 - export function getSharedDocumentUrl(stateful: Function | Object) {
 -     const state = toState(stateful);
 -     const { documentUrl } = state['features/etherpad'];
 -     const { displayName } = state['features/base/settings'];
 - 
 -     if (!documentUrl) {
 -         return undefined;
 -     }
 - 
 -     const params = new URLSearchParams(ETHERPAD_OPTIONS);
 - 
 -     if (displayName) {
 -         params.append('userName', displayName);
 -     }
 - 
 -     return `${documentUrl}?${params.toString()}`;
 - }
 
 
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