// ==UserScript==
// @name         Typing Accented Characters in Oveleaf (for macOS only)
// @namespace    https://github.com/alberti42/
// @version      1.8
// @description  Block dead keys in Overleaf to allow for typing of accented letters. It also allows typing ß. It blocks undesired key combinations.
// @author       Andrea Alberti
// @match        https://www.overleaf.com/*
// @grant        none
// @license      MIT
// ==/UserScript==
//
// This script is designed for macOS users working in Overleaf who encounter issues
// with typing accented letters due to dead keys. It blocks dead key events to allow
// proper input of accented characters when using dead keys. To install this script
// in Greasemonkey (for Firefox) or Violentmonkey (for Chrome/Firefox/Edge),
// simply copy and paste it into a new userscript in your userscript manager.
// For more information on how to use dead keys to type accented characters on a Mac,
// please refer to the official Apple guide: https://support.apple.com/en-ph/guide/mac-help/mh27474/mac
//
(function() {
'use strict';
// Global debug variable
const debug = false;  // Set to true for logging, false to disable logs
// Function to log messages if debug is enabled
function logDebug(message, ...optionalParams) {
if (debug) {
console.log(message, ...optionalParams);
}
}
// Function to insert text into a contenteditable element at the cursor position
function insertTextInContentEditable(text) {
// Get the active element and check if it's contenteditable
var activeElement = document.activeElement;
if (!activeElement || !activeElement.getAttribute('contenteditable')) {
console.error("Active element is not contenteditable or not found");
return;
}
const selection = window.getSelection();
if (!selection.rangeCount) return;
const range = selection.getRangeAt(0);  // Get the range at the current cursor position
range.deleteContents();  // Remove any selected text
const textNode = document.createTextNode(text);  // Create a text node for the 'ß' character
range.insertNode(textNode);  // Insert the 'ß' character at the current position
range.setStartAfter(textNode);  // Move the cursor after the inserted character
range.setEndAfter(textNode);
selection.removeAllRanges();  // Clear all current selections
selection.addRange(range);  // Add the new range (after the inserted character)
}
// Event listener to block dead keys and accented letters
function handleKeydown(e) {
// Log the event details for debugging
if(debug) {
console.log("Event Triggered:");
console.log("Key: ", e.key);
console.log("Code: ", e.code);
console.log("Alt Key: ", e.altKey);
console.log("Key Code: ", e.keyCode);
console.log("Shift Key: ", e.shiftKey);
console.log("Ctrl Key: ", e.ctrlKey);
console.log("Meta Key: ", e.metaKey);
}
// Block dead keys
if (e.key === 'Dead') {
e.preventDefault();  // Block the key
logDebug("Blocked dead key");
}
// Block Alt + ArrowDown and Alt + ArrowUp combinations
else if (e.altKey && (e.key === 'ArrowDown' || e.key === 'ArrowUp')) {
e.preventDefault();  // Block the key
logDebug("Blocked arrow up/down keys");
}
// Block <0xa0> character
else if (e.altKey && e.shiftKey && e.keyCode === 32) {
e.preventDefault();  // Block the key
logDebug("Blocked <0xa0> character");
}
// Allow Alt + S for typing the character 'ß'
else if (e.altKey && e.keyCode === 83 && e.key === 'ß') {
e.preventDefault();  // Prevent the default action
logDebug("Alt+S Detected: allow typing 'ß'");
insertTextInContentEditable('ß');  // Insert 'ß' at the current cursor position
}
// Allow Alt + Shift + 2 for typing the character '€'
else if (e.altKey && e.shiftKey && e.keyCode === 50 && e.key === '€') {
e.preventDefault();  // Prevent the default action
logDebug("Alt+Shift+2 Detected: allow typing '€'");
insertTextInContentEditable('€');  // Insert 'ß' at the current cursor position
}
}
// Attach the event listener to the document
document.addEventListener('keydown', handleKeydown, true);
})();