Mark as viewed and jump to next unviewed file in Github Pull Requests review

github.com.js

// change the following two key combos as you like
// this key combo will mark the current focused file as viewed and jump to the next unviewed file
const viewedAndNextKey = "ctrl-alt-meta-shift-v";
// this key combo will just jump to the next unviewed file
const nextKey = "ctrl-alt-meta-shift-w";

const modifiers = ["ctrl", "alt", "meta", "shift"];

const viewedAndNextKeyParts = viewedAndNextKey.split("-");
const nextKeyParts = nextKey.split("-");

function testEventSequence(event, sequence) {
  for (const command of sequence) {
    switch (command) {
      case "ctrl": {
        if (!event.ctrlKey) return false;
        break;
      }
      case "alt": {
        if (!event.altKey) return false;
        break;
      }
      case "meta": {
        if (!event.metaKey) return false;
        break;
      }
      case "shift": {
        if (!event.shiftKey) return false;
        break;
      }
      default: {
        if (command !== event.key.toLowerCase()) return false;
      }
    }
  }
  return true;
}

function testEvent(event) {
  if (testEventSequence(event, viewedAndNextKeyParts)) return "view";
  if (testEventSequence(event, nextKeyParts)) return "next";
  return false;
}

window.addEventListener("keydown", (event) => {
  const commandType = testEvent(event);
  if (commandType) {
    let hasFound = false;
    const elements = document.querySelectorAll(".js-reviewed-toggle input");
    for (let element of elements) {
      if (hasFound && !element.checked) {
        element.closest(".file").scrollIntoView();
        element.focus();
        return;
      }
      if (element === document.activeElement) {
        hasFound = true;
        if (commandType === "view") element.click();
      }
    }
    if (!hasFound) {
      const uncheckedElements = document.querySelectorAll(
        ".js-reviewed-toggle input:not(:checked)"
      );
      if (uncheckedElements.length) {
        uncheckedElements[0].closest(".file").scrollIntoView();
        uncheckedElements[0].focus();
      }
    }
  }
});