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backlinks improvements, #2349

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zadam
2021-12-02 22:00:42 +01:00
parent bbceb6251a
commit 630d9f2e45
6 changed files with 122 additions and 100 deletions
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194
src/routes/api/note_map.js
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@@ -182,6 +182,97 @@ function removeImages(document) {
}
}
const EXCERPT_CHAR_LIMIT = 200;
function findExcerpts(sourceNote, referencedNoteId) {
const html = sourceNote.getContent();
const document = new JSDOM(html).window.document;
const excerpts = [];
removeImages(document);
for (const linkEl of document.querySelectorAll("a")) {
const href = linkEl.getAttribute("href");
if (!href || !href.endsWith(referencedNoteId)) {
continue;
}
linkEl.classList.add("backlink-link");
let centerEl = linkEl;
while (centerEl.tagName !== 'BODY' && centerEl.parentElement.textContent.length <= EXCERPT_CHAR_LIMIT) {
centerEl = centerEl.parentElement;
}
const excerptEls = [centerEl];
let excerptLength = centerEl.textContent.length;
let left = centerEl;
let right = centerEl;
while (excerptLength < EXCERPT_CHAR_LIMIT) {
let added = false;
const prev = left.previousElementSibling;
if (prev) {
const prevText = prev.textContent;
if (prevText.length + excerptLength > EXCERPT_CHAR_LIMIT) {
const prefix = prevText.substr(prevText.length - (EXCERPT_CHAR_LIMIT - excerptLength));
const textNode = document.createTextNode("…" + prefix);
excerptEls.unshift(textNode);
break;
}
left = prev;
excerptEls.unshift(left);
excerptLength += prevText.length;
added = true;
}
const next = right.nextElementSibling;
if (next) {
const nextText = next.textContent;
if (nextText.length + excerptLength > EXCERPT_CHAR_LIMIT) {
const suffix = nextText.substr(nextText.length - (EXCERPT_CHAR_LIMIT - excerptLength));
const textNode = document.createTextNode(suffix + "…");
excerptEls.push(textNode);
break;
}
right = next;
excerptEls.push(right);
excerptLength += nextText.length;
added = true;
}
if (!added) {
break;
}
}
const excerptWrapper = document.createElement('div');
excerptWrapper.classList.add("ck-content");
excerptWrapper.classList.add("backlink-excerpt");
for (const childEl of excerptEls) {
excerptWrapper.appendChild(childEl);
}
excerpts.push(excerptWrapper.outerHTML);
}
return excerpts;
}
function getBacklinks(req) {
const {noteId} = req.params;
const note = becca.getNote(noteId);
@@ -192,105 +283,22 @@ function getBacklinks(req) {
let backlinks = note.getTargetRelations();
if (backlinks.length > 50) {
backlinks = backlinks.slice(0, 50);
}
let backlinksWithExcerptCount = 0;
return backlinks.map(backlink => {
const sourceNote = backlink.note;
const html = sourceNote.getContent();
const dom = new JSDOM(html);
const excerpts = [];
const document = dom.window.document;
removeImages(document);
for (const linkEl of document.querySelectorAll("a")) {
const href = linkEl.getAttribute("href");
if (!href || !href.includes(noteId)) {
continue;
}
linkEl.style.fontWeight = "bold";
linkEl.style.backgroundColor = "yellow";
const LIMIT = 200;
let centerEl = linkEl;
while (centerEl.tagName !== 'BODY' && centerEl.parentElement.textContent.length < LIMIT) {
centerEl = centerEl.parentElement;
}
const sub = [centerEl];
let counter = centerEl.textContent.length;
let left = centerEl;
let right = centerEl;
while (true) {
let added = false;
const prev = left.previousElementSibling;
if (prev) {
const prevText = prev.textContent;
if (prevText.length + counter > LIMIT) {
const prefix = prevText.substr(prevText.length - (LIMIT - counter));
const textNode = document.createTextNode("…" + prefix);
sub.unshift(textNode);
break;
}
left = prev;
sub.unshift(left);
counter += prevText.length;
added = true;
}
const next = right.nextElementSibling;
if (next) {
const nextText = next.textContent;
if (nextText.length + counter > LIMIT) {
const suffix = nextText.substr(nextText.length - (LIMIT - counter));
const textNode = document.createTextNode(suffix + "…");
sub.push(textNode);
break;
}
right = next;
sub.push(right);
counter += nextText.length;
added = true;
}
if (!added) {
break;
}
}
const div = document.createElement('div');
div.classList.add("ck-content");
div.classList.add("backlink-excerpt");
for (const childEl of sub) {
div.appendChild(childEl);
}
const subHtml = div.outerHTML;
excerpts.push(subHtml);
if (sourceNote.type !== 'text' || backlinksWithExcerptCount > 50) {
return {
noteId: sourceNote.noteId,
relationName: backlink.name
};
}
backlinksWithExcerptCount++;
const excerpts = findExcerpts(sourceNote, noteId);
return {
noteId: sourceNote.noteId,
excerpts