export-bookmarks/popup.js

function print(subTree, level) {
	let title = subTree.title;
	let id = subTree.id;
	let enabled = subTree.children.every(function(child) {
		return child.children == null;
	});
	let indentation = ' '.repeat(level);

	console.log(indentation + title + ' (' + id + '): ' + (enabled ? 'enabled' : 'disabled'));

	let select = document.getElementById('select');

	let option = document.createElement('option');
	option.setAttribute('value', id);
	if(!enabled) {
		option.setAttribute('disabled', 'disabled');
	}
	option.innerHTML = indentation + title;

	select.appendChild(option);

	subTree.children.forEach(function (node) {
		if(node.children == null) {
			//bookmark
		} else {
			//folder

			print(node, level + 1);	
		}
	});
}

chrome.bookmarks.getTree(function(tree) {
	tree[0].children.forEach(function(node) {
		print(node, 0);	
	});
});

document.getElementById('exportButton').onclick = function() {
	let deleteFolder = document.getElementById('delete').checked;
	let includeNames = document.getElementById('includeNames').checked;

	let select = document.getElementById('select');
	let folderId = select.options[select.selectedIndex].value;

	chrome.bookmarks.getSubTree(folderId, function(nodes) {
		let folder = nodes[0];
		console.log(folder);
		let folderName = folder.title;

		let fileContents = folderName + '\n\n';

		for(bookmark of folder.children) {
			if(includeNames) {
				fileContents += bookmark.title + ': ' + bookmark.url + '\n';
			} else {
				fileContents += bookmark.url + '\n';
			}
		}

		let fileBlob = new Blob([ fileContents ], { type: "text/plain;charset=utf-8" });
		saveAs(fileBlob, folderName + '.txt');

		if(deleteFolder && confirm('Delete folder?')) {
			chrome.bookmarks.removeTree(folderId);	
		}
	});
};