Commit 85beef65 authored by Jakob Moser's avatar Jakob Moser
Browse files

Extract "waitFor" util function

parent 6dde8fd4

static/js/jslinux.api.mjs

+3 −11
Original line number Diff line number Diff line 
/** API to interact with lib/jslinux **/



import { waitFor } from "./util.mjs"



/**

 * Try to parse the given line as if it contained a prompt, maybe followed by user input.

 *
@@ -160,17 +162,7 @@ function getCurrentPrompt() { 
 * Returns the current prompt as soon as one is shown

 */

function prompt() {

    return new Promise((resolve)=>{

        const intervalId = setInterval(checkAndResolve, 100)

    

        function checkAndResolve() {

            const currentPrompt = getCurrentPrompt()

            if(currentPrompt !== null) {

                clearInterval(intervalId)

                resolve(currentPrompt)

            }

        }

    })

    return waitFor(getCurrentPrompt)

}



/**

static/js/util.mjs

+18 −0
Original line number Diff line number Diff line
@@ -26,3 +26,21 @@ export function createElementWithClass(tagName, ...classes) { 
    element.classList.add(...classes)

    return element

}



/**

 * Wait until "check" returns a truthy value, then, return it

 * @param {() => any} check A function that returns any value

 */

export async function waitFor(check) {

    return new Promise((resolve)=>{

        const intervalId = setInterval(checkAndResolve, 100)

    

        function checkAndResolve() {

            const predicateValue = check()

            if(predicateValue) {

                clearInterval(intervalId)

                resolve(predicateValue)

            }

        }

    })

}