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@leomelzer
Created Jun 19, 2018
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metatag-diff: Compare (diff) metatags of prod and stage host version given an article slug.
const fetch = require("node-fetch");
const cheerio = require("cheerio");
const diff = require("diff");
const colors = require("colors");
const inputSlug = process.argv[2];
const notImplemented = [
"[rel=amphtml]",
"[property='og:image']",
"[property='og:description']"
];
const PROD_HOST = "https://some-prod-host.example/";
const DEV_HOST = "https://basic:auth@some-stage-host.example/";
function fetchHtml(slug) {
async function getHtml(url) {
const response = await fetch(url);
return await response.text();
}
return Promise.all([
getHtml(`${PROD_HOST}${slug}`),
getHtml(`${DEV_HOST}${slug}`)
]);
}
function extractMetatags(html) {
const $ = cheerio.load(html);
return $("meta, link, title")
.not(notImplemented.join(", "))
.map((i, tag) => $.html(tag).trim())
.get();
}
function compare([prodTags, stageTags]) {
prodTags.forEach((check, index) => {
const parts = diff.diffChars(check, stageTags[index] || "");
parts.forEach(part => {
const color = part.added ? "green" : part.removed ? "red" : "grey";
// This uses the extended String prototype (see `colors` package)
process.stderr.write(part.value[color]);
});
console.log();
});
}
function main(slug) {
fetchHtml(slug)
.then(responses => responses.map(extractMetatags))
.then(metatags => metatags.map(metatag => metatag.sort()))
.then(compare)
.catch(err => console.log(err));
}
main(inputSlug);
{
"name": "metatag-diff",
"version": "1.0.0",
"description": "Compare (diff) metatags of prod and stage host version given an article slug.",
"main": "index.js",
"scripts": {
"start": "node index.js"
},
"author": "leomelzer",
"license": "UNLICENSED",
"dependencies": {
"cheerio": "^1.0.0-rc.2",
"colors": "^1.3.0",
"diff": "^3.5.0",
"node-fetch": "^2.1.2"
},
"devDependencies": {
"eslint": "^4.19.1",
"prettier": "^1.13.5"
}
}
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