Export-import Github repo labels

export-github-repo-labels.js

// 1. Go on you labels page:
// eg.: https://github.com/EbookFoundation/free-programming-books/labels
//
// 2. Paste this script in your console / save as browser bookmarklet, and then execute it
// 3. Copy the output / download files and now you can import it using https://github.com/popomore/github-labels !
//
// How to bookmark: https://gist.github.com/caseywatts/c0cec1f89ccdb8b469b1

(function(undefined) {

var reposlug;
try {
  window.location.hostname.indexOf("github.com") != -1 && (reposlug = window.location.pathname.match(/([^\/]+\/[^\/]+)\/labels/i)[1].toLowerCase().replace(/\//ig, "__"));
} catch(e) { }
if (!reposlug) {
   throw "It seems that you are not in a github.com repo labels page: " + window.location;
}

var labels = [].slice.call(document.querySelectorAll(".js-label-link")).map(function(el) {
  var styles = window.getComputedStyle(el),
      form = el.closest('.js-labels-list-item').querySelector('.js-label-form');
  return {
    name: (el.textContent || el.innerText).trim(), /* required */
    description: el.getAttribute("title") || el.getAttribute("aria-label") || form['label[description]'].value || null, /* optional */
    color: rgba2hex(styles.getPropertyValue("background-color")), /* required */
  };
});
var json = JSON.stringify(labels, null, 2), yaml = labels2yml(labels);

var exts = (window.prompt("Choice download formats to save " +labels.length+ " labels.\n\n Options: json,yml,yaml\n\nCancel or leave empty to ignore.", "json,yml")||"").split(/\s*,\s*/);
(exts.includes("json")) && save(reposlug+"__labels.json", "application/json", json);
(exts.includes("yaml") || exts.includes("yml")) && save(reposlug+"__labels.yml", "application/yaml", yaml);

return {
  labels: labels,
  jsonText: json,
  yamlText: yaml,
};


function hex(x) {
  return ("0" + parseInt(x).toString(16)).slice(-2);
}
function rgba2hex(rgba) {
  rgba = rgba.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(,\s*\d+\.*\d+)?\)$/);
  return rgba.slice(1,4).reduce(function(s, x){ return s + hex(x); }, "");
}
function save(filename, type, content) {
  const blob = new Blob([content], { type: type });
  const e = document.createEvent("MouseEvents");
  const a = document.createElement("a");
  a.download = filename;
  a.href = window.URL.createObjectURL(blob);
  a.dataset.downloadurl = [type, a.download, a.href].join(":");
  e.initMouseEvent("click", true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
  a.dispatchEvent(e);
}
function labels2yml(labels) {
  return labels.reduce(function(s, l){
    return s +"  - name: \"" +(l.name)+ "\"\n    description: \"" +(l.description||"")+ "\"\n    color: \"" +(l.color)+ "\"\n";
  }, "labels:\n");
}
}());

How to bookmark a script: https://gist.github.com/caseywatts/c0cec1f89ccdb8b469b1

tl;dr gh label clone src-org/src_repo --repo dest-org/dest_org

If you're coming by this thread in 2024 or later, I highly recommend seeing the official GitHub CLI [1].

[1] https://cli.github.com/manual/gh_label_clone