autoReviewPullRequest.js

const child_process = require("child_process");
const https = require("https");
const path = require("path");
const fs = require("fs");
const pegjs = require("pegjs");
const rimraf = require("rimraf");

const options = {
    port: 443,
    method: 'GET',
    headers: {
        'Accept': 'application/json',
        'User-Agent': 'action'
    }
}

var requestChangeMessage = "";

async function autoReviewPullRequest() {
    let env = process.env;
    let pr = env.PR_NUMBER;

    try {
        let files = JSON.parse(await getJson("https://api.github.com/repos/devonfw-tutorials/tutorials/pulls/" + pr + "/files"));
        for(let i = 0; i < files.length; i++) {
            if(path.basename(files[i].filename) == "index.asciidoc") {
                let contents = JSON.parse(await getJson(files[i].contents_url));
                if(contents.download_url) {
                    let playbook = downloadFile(contents.download_url);
                    if(!playbook || playbook == "") {
                        throw new Error("Unable to download file from " + contents.download_url); 
                    }

                    parseFile(playbook, files[i].filename);
                    rimraf.sync(playbook);
                }
            }
        }
    } catch(e) {
        console.error(e);
        fs.writeFileSync(path.join(__dirname, "message.txt"), requestChangeMessage);
        return -1;
    }

    fs.writeFileSync(path.join(__dirname, "message.txt"), requestChangeMessage);
    return 0;
}

async function getJson(url) {
    return new Promise((resolve, reject) => {
        https.get(url, options, function(resp) {
            if(resp.statusCode != 200) {
                console.log(resp);
            }

            let json = "";
            resp.on("data", (data) => {
                json += data;
            });

            resp.on('end', () => {
                resolve(json);
            });
        });
    });
}

function downloadFile(url) {
    let cp = child_process.spawnSync(`curl -o index.asciidoc ${url}`, { shell: true, encoding: 'utf-8' });
    if(!fs.existsSync(path.join(__dirname, "index.asciidoc"))) {
        console.log(cp);
        return "";
    }
    return path.join(__dirname, "index.asciidoc");
}

function parseFile(file, filename) {
    let def = fs.readFileSync(path.join(__dirname, "tutorial-compiler", "engine", "parser.def"), 'utf8');
    let parser = pegjs.generate(def);
    let input = fs.readFileSync(file, 'utf8');
    let parseResult = parser.parse(input);

    let description = parseResult[1][2].descriptionlines;
    
    let messageBody = "";
    if(!description.includes("### Prerequisites")) {
      messageBody = "The description must describe the prerequisites of a tutorial. It must contain a '### Prerequisites' part.";
    }

    if(!description.includes("### Learning goals")) {
        messageBody = (messageBody == "")
           ? "The description should describe what the user will learn in the tutorial. It must contain a '### Learning goals' part."
           : messageBody + " The description should describe what the user will learn in the tutorial. It must contain a '## Learning goals' part.";
      }

    if(messageBody != "") {
      requestChangeMessage = (requestChangeMessage == "")
        ? "The tutorial description in file " + filename + " does not meet the desired requirements. " + messageBody
        : requestChangeMessage += " The tutorial description in file " + filename + " does not meet the desired requirements. " + messageBody;
    }
}

autoReviewPullRequest();