Automated checks when creating PRs

pr-check.js

// ==UserScript==
// @name         Github PR
// @namespace    https://github.com/gabrihellmateus/
// @version      0.1
// @description  Automate tasks for helping creating PRs
// @author       Gabriel Lima (inspired by Doug Bacelar)
// @match        https://github.com/gabrihellmateus/mercearia/pull/*
// ==/UserScript==

(function() {
  'use strict';

  const PR_BASE_URI = 'https://github.com/gabrihellmateus/mercearia/pull/';

  const userName = document.querySelector('meta[name="user-login"]').content;
  const header = document.getElementById('partial-discussion-header');
  const sidebar = document.getElementsByClassName('discussion-sidebar')[0];
  const author = header.getElementsByClassName('author')[0].innerText;
  const title = header.getElementsByClassName('js-issue-title')[0].innerText;

  const PRCheck = {
    init: () => {
      if (!PRCheck.isInPrPage()) return;

      PRCheck.log(`🎯`, `PR Page Detected!`);
      PRCheck.addAssignYourself();
      PRCheck.addLabel();
    },

    isInPrPage: () => !!window.location.href.match(PR_BASE_URI),

    addAssignYourself: () => {
      const assignSelfButton = sidebar.getElementsByClassName('js-issue-assign-self')[0];

      if (!assignSelfButton) return;

      if (author === userName) {
        assignSelfButton.click();
        PRCheck.log(`✅`, `Completed: assigned PR to yourself!`);
      }
    },

    mutationOberserver: (callback) => {
      const MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;

      const observer = new MutationObserver(function(mutations) {
        mutations.forEach(function(mutation) {
          if (mutation.type === 'childList') {
            callback(mutation);
          }

          if (mutation.type === 'subtree') {
            callback();
          }

          if (mutation.type === 'attributes') {
            callback();
          }

          if (mutation.type === 'characterData') {
            callback();
          }
        });
      });

      return observer;
    },

    addLabel: () => {
      const config = {
        childList: true,
        subtree: true,
        attributes: false,
        characterData: false
      };

      const target = sidebar.getElementsByClassName('js-issue-labels-menu-content')[0];
      const sidebarLabels = sidebar.getElementsByClassName('sidebar-labels')[0];
      const labelToggle = sidebarLabels.getElementsByClassName('discussion-sidebar-toggle')[0];

      labelToggle.click();

      const observer = PRCheck.mutationOberserver((mutation) => {
        mutation.addedNodes.forEach(function(node) {
          if (node.className === 'select-menu-list') {
            let labels = sidebarLabels
                    .getElementsByClassName('select-menu-list')[0]
                    .getElementsByClassName('select-menu-item');

            PRCheck.checkLabel(Array.from(labels), labelToggle);
          }
        });
      });

      observer.observe(target, config);
    },

    checkLabel: (labels, labelToggle) => {
      labels.forEach((label, i, arr) => {
        let labelInput = label.querySelector('input[data-label-name]');
        let labelName = labelInput.getAttribute('data-label-name');
        let regex = new RegExp(labelName, 'ig');

        if (title.match(regex) && !labelInput.checked) {
          label.click();
          PRCheck.log(`🎯`, `Label ${labelName} applied!`);
        }

        if (Object.is(arr.length - 1, i)) {
          PRCheck.dismissLabelDialog(labelToggle);
          PRCheck.log(`✅`, `Completed: all labels applied!`);
        }
      });
    },

    dismissLabelDialog: (labelToggle) => {
      labelToggle.click();
    },

    log: (emoji, message) => {
      console.log(`----> ${emoji} ${message}`);
    }
  };

  PRCheck.log(`🤖`, `GitHub PR script is running!`);

  PRCheck.init();

  window.onpopstate = function(event) {
    PRCheck.init();
  };
})();