Stack Pop

Adds a the first StackOverflow answer to your search query
当前为 2023-01-05 提交的版本，查看最新版本。
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// ==UserScript==
// @name         Stack Pop
// @namespace    https://codeberg.org/happybits/stack-pop
// @version      1.1.1
// @license      MIT 
// @description  Adds a the first StackOverflow answer to your search query
// @author       happybits 
// @match        https://www.google.com/search*
// @icon
// @grant        GM_xmlhttpRequest
// ==/UserScript==

// This is a userscript StackPop that is supposted to run by Tampermonkey when the user enters a google search

try {

    go()

    async function go() {

        // Wait for the google search to appear in the DOM

        const rso = await waitFor("#rso")

        // Inject StackPop before the google search result

        const stackDiv = document.createElement("div")
        stackDiv.id = "stack-pop"
        rso.before(stackDiv)

        // Find the first search result that leads to Stack Overflow

        const googleResults = Array.from(rso.children)

        const firstStackOverflowHit = googleResults

            .filter(result => result.querySelector("a")?.href)
            .map(result => result.querySelector("a").href)
            .find(link => link.startsWith("https://stackoverflow.com"))

        // If any, get the answer inject it to the search page

        if (firstStackOverflowHit) {

            // HTTP call using Tampermonkey's built in function

            GM_xmlhttpRequest({
                method: "GET",
                url: firstStackOverflowHit,
                onload: function (response) {

                    // Build a DOM from the text-response and parse the question and the first answer

                    const stackOverFlowPage = new DOMParser().parseFromString(response.responseText, 'text/html');
                    const question = stackOverFlowPage.querySelector("h1").textContent
                    log(question)
                    const firstAnswerContent = stackOverFlowPage.querySelector(".answer .s-prose").innerHTML

                    // Styling for the StackOverflow answer 

                    const stackPopStyling = `
                    #stack-pop {
                        width: 700px; 
                    }
                    
                    #stack-pop li {
                        margin-left: 1.5em;
                    }
                    
                    #stack-pop pre {
                        background-color: #eee;
                        padding: 1em;
                        position:relative;
                    }
 
                    #stack-pop .copy-icon{
                        position:absolute;
                        right:4px;
                        top:4px;
                        height:33px;
                        width:33px;
                        opacity:0.5;
                        cursor:pointer;
                    }

                    #stack-pop .copy-icon:hover{
                        opacity:1;
                    }

                    #stack-pop code {
                        background-color: #eee;
                    }
                    
                    #stack-pop img {
                        max-width: 100%;
                    }
                    `

                    // Create the StackPop widget
                    // Yes I know, it's inline styling etc, but it's by design, I think it's easy to read and compact!
                    // Or am I wrong ;) ?

                    stackDiv.innerHTML = `
                    
                    <style>${stackPopStyling}</style>

                    <div style="border:solid 2px #f48225; margin: 1em 0; overflow: auto;">

                        <a href="${firstStackOverflowHit}" style="text-decoration:none">
                            <div style="cursor:pointer; background-color:#f48225; color:white; padding:0.5em; font-size: 1.5em">
                                ${encodeHTMLEntities(question)}
                            </div>
                        </a>

                        <div style="padding:0 1.5em 1.5em 1.5em;">
                            ${firstAnswerContent}
                        </div>

                    </div>
                    `

                    // Add the possiblitiy to copy code to the clipboard

                    stackDiv.querySelectorAll("pre").forEach(preElement => {

                        const elementHasCode = preElement.firstChild.nodeName.toLowerCase() === "code"

                        if (elementHasCode) {
                            const codeToCopy = preElement.querySelector("code").innerText
                            preElement.append(copyIcon(codeToCopy))
                        }
                    });

                }
            });
        }


    }

    // This is a generic method that can be used to select element that may take some time to appear in the DOM
    // The second parameter "scope" is optional, of you want to limit the query

    function waitFor(selector, scope) {

        const pause = 10
        let maxTime = 10000

        return new Promise(resolve => {

            function inner() {
                if (maxTime <= 0) {
                    throw "Timeout for select " + selector
                }
                const element = (scope ?? document).querySelector(selector)

                if (element) {
                    resolve(element)
                    return
                }
                maxTime -= pause
                setTimeout(inner)
            }

            inner()
        })
    }

    // A simple log function which shows with a TAMPER-prefix

    function log(...message) {
        console.log('%c TAMPER ', 'color: white; background-color: #61dbfb', ...message);
    }

    // Create a copy icon (used for copying code to the clipboard)

    function copyIcon(textToCopyIfClicked) {

        const img = document.createElement("img")
        img.className = "copy-icon"
        img.title = "Copy to clipboard"
        img.src = "data:image/png;base64, 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"
        img.onclick = () => copyTextToClipboard(textToCopyIfClicked)
        return img
    }

    // Copy text to clipboard (surprise)

    function copyTextToClipboard(text) {

        navigator.clipboard.writeText(text).then(function () {
            log('Copied to clipboard');
        }, function (err) {
            throw err
        });
    }

    // Encode and decode string to and from HTML

    function encodeHTMLEntities(rawStr) {
        return rawStr.replace(/[\u00A0-\u9999<>\&]/g, ((i) => `&#${i.charCodeAt(0)};`));
    }

    function decodeHTMLEntities(rawStr) {
        return rawStr.replace(/&#(\d+);/g, ((_, dec) => `${String.fromCharCode(dec)}`));
    }

}

// Unexpected errors is shown in red

catch (exception) {
    console.log('%c TAMPER ', 'color: white; background-color: red', exception);
}
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