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habrareply.js
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habrareply.js
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/**
* A content script that is injected into Habr.com's profile page.
*/
if (document.readyState == 'interactive' || document.readyState == 'complete') {
init();
} else {
document.addEventListener('DOMContentLoaded', init);
}
function init() {
initInjectCss();
// Add a button to the page
var btn = $('<button class="hr-start-btn btn btn_outline_grey btn_x-large">Загрузить ответы</button>');
var userStatsBlock = $('.page-header .user-info__stats');
if (!userStatsBlock.length) {
console.error("Cannot find user stats block, maybe markup has changed");
$('body').prepend(btn);
} else {
// Find buttons block
var buttonsBlock = userStatsBlock.find('.user-info__buttons');
if (!buttonsBlock.length) {
// There is no buttons block for anonymous users, so add it ourselves
buttonsBlock = $('<div class="user-info__buttons"></div>');
userStatsBlock.append(buttonsBlock);
}
buttonsBlock.prepend(btn);
}
btn.on('click', function () {
function displayProgress(done, errs, total) {
btn.text('Загрузка (' + done + '/' + total +')' + (errs > 0 ? ' +' + errs + ' ош.' : ''));
}
addOutlineForButton(btn, false);
btn.text('Загрузка ответов…');
var finish = processComments(displayProgress);
finish.then(function () {
btn.text("✓ Ответы загружены");
// Cache takes a lot of memory, so free it
loadPostDom.clearCache();
}, function () {
addOutlineForButton(btn, true);
btn.text("✗ Ошибка");
loadPostDom.clearCache();
});
});
}
/**
* Adds styles to the page
*/
function initInjectCss() {
var css = [
'.hr-more { color: #999; margin-left: 30px; margin-top: 15px; font-size: 11px; }',
'.hr-replies { margin: 10px 0 10px 280px; }',
'.hr-replies .comment__message { font-size: 12px; }',
'.hr-replies .user-info__nickname_small { font-size: 11px; }',
'.hr-replies .comment__date-time { font-size: 11px; }'
].join("\n");
var style = $('<style>' + css + '</style>');
$('head,body').first().append(style);
}
function addOutlineForButton(btn, enable) {
if (enable) {
btn.addClass('btn_outline_grey');
} else {
btn.removeClass('btn_outline_grey');
}
}
/**
* Walk through comments on the page and load replies for each one.
*/
function processComments(onProgress) {
var comments = $('#comments > li > .comment');
var finishPromises = [];
var done = 0;
var errs = 0;
var total = comments.length;
comments.each(function (index, comment) {
comment = $(comment);
var finished = processComment(comment);
finishPromises.push(finished);
finished.then(null, function (e) {
console.error("Comment process error: " + e.message);
console.log(e);
});
finished.then(function () {
done++;
onProgress && onProgress(done, errs, total);
}, function () {
errs++;
onProgress && onProgress(done, errs, total);
});
});
// TODO: fails too early and clears cache too early
return Promise.all(finishPromises);
}
/**
* Loads and displays replies for a single comment
*/
function processComment(comment) {
var alreadyProcessed = comment.attr('data-habrareplied');
if (alreadyProcessed) {
return Promise.resolve(true);
}
var m = /^comment_(\d+)$/.exec(comment.attr('id') || '');
if (!m) {
return Promise.reject(new Error('Invalid id attribute'));
}
var id = m[1];
var href = comment.find('.icon_comment-anchor').first().attr('href');
if (!href) {
return Promise.reject(new Error("Cannot find link at comment " + id));
}
var postUrl = extractPostUrl(href);
if (!postUrl) {
return Promise.reject(new Error('Cannot parse post URL for comment ' + id));
}
var finished = loadPostDom(postUrl).then(function (dom) {
var replies = findRepliesInPost(dom, id);
replies = removeNestedComments(replies);
fixHashUrlsInReplies(replies, postUrl);
var commentShell = comment.closest('.content-list__item_comment');
if (!commentShell.length) {
throw new Error("Cannot find comment shell");
}
if (replies.length > 0) {
var repliesWrap = $('<div class="hr-replies"></div>');
commentShell.after(repliesWrap);
repliesWrap.append(replies);
}
comment.attr('data-habrareplied', 1);
return true;
});
return finished;
}
function extractPostUrl(url) {
var m = /(\/post\/\d+\/|\/company\/[^?#]+\/)#/.exec(url);
return m ? m[1] : null;
}
function loadPostDom(url) {
if (loadPostDom.cache[url]) {
return loadPostDom.cache[url];
}
var p = loadPostUncached(url).then(function (html) {
// Parse into DOM, very slowly
return $(html);
});
p.then(null, function (e) {
delete loadPostDom.cache[url];
throw e;
});
loadPostDom.cache[url] = p;
return p;
}
loadPostDom.clearCache = function () {
loadPostDom.cache = {};
}
loadPostDom.cache = {};
var nextRequestTime = 0;
function loadPostUncached(url) {
var now = Date.now();
var WAIT = 900; // ms
var fetchStartPromise;
if (now < nextRequestTime) {
var waitTime = Math.max(nextRequestTime - now, 0);
// console.log("Wait: " + waitTime);
nextRequestTime = nextRequestTime + WAIT;
fetchStartPromise = new Promise(function (res, rej) {
setTimeout(function () { res(true); }, waitTime);
});
} else {
fetchStartPromise = Promise.resolve(true);
nextRequestTime = now + WAIT;
}
var responsePromise = fetchStartPromise.then(function () {
return fetch(url);
});
var htmlPromise = responsePromise.then(function (response) {
if (!response.ok) {
throw new Error('Fetch ' + url + ', error: status ' + response.status);
}
return response.text();
});
return htmlPromise;
}
function findRepliesInPost(dom, commentId) {
var comment = dom.find('#comment_' + commentId);
comment = comment.closest('.js-comment');
if (!comment.length) {
throw new Error('Cannot find comment ' + commentId + 'in post body');
}
var children = comment.children('ul.content-list_nested-comments').children('li');
children = children.clone();
return children;
}
function removeNestedComments(replies) {
var replacement = '<div class="hr-more">Ответы на комментарий скрыты</div>';
var nested = replies.children('ul.content-list_nested-comments');
nested.has('.js-comment').replaceWith(replacement);
return replies;
}
function fixHashUrlsInReplies(replies, postUrl) {
var linkTags = replies.find('a[href^="#"]');
linkTags.each(function (index, link) {
link = $(link);
var href = link.attr('href') || '';
if (href.match(/^#./)) {
var newHref = postUrl + href;
link.attr('href', newHref);
}
});
}