Extracts Go package documentation (API definitions, examples) from pkg.go.dev and converts it into a structured LLM.txt format, suitable for local AI/LLM reference and analysis.
// ==UserScript==
// @name Pkg.go.dev to LLM.txt Formatter
// @name:zh-CN Pkg.go.dev 文档转 LLM.txt 格式化工具
// @namespace https://x.com/janxin
// @version 0.1.1
// @description Extracts Go package documentation (API definitions, examples) from pkg.go.dev and converts it into a structured LLM.txt format, suitable for local AI/LLM reference and analysis.
// @description:zh-CN 从 pkg.go.dev 提取 Go 语言包的文档内容（包括 API 定义和代码示例），并将其转换为结构化的 LLM.txt 文本格式，方便在本地使用大型语言模型 (LLM) 进行参考和分析。
// @author hellowor
// @match https://pkg.go.dev/*
// @icon https://pkg.go.dev/favicon.ico
// @grant GM_addStyle
// @grant GM_setClipboard
// @homepageURL https://x.com/janxin
// @supportURL https://x.com/janxin
// @license MIT
// ==/UserScript==
(function() {
'use strict';
GM_addStyle(`
.llm-download-button {
position: fixed;
bottom: 20px;
right: 20px;
z-index: 9999;
padding: 10px 15px;
background-color: #007d9c;
color: white;
border: none;
border-radius: 5px;
cursor: pointer;
font-size: 14px;
box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}
.llm-download-button:hover {
background-color: #005f79;
}
`);
function getCleanText(element) {
return element ? element.textContent.trim() : '';
}
function getCodeFromPre(preElement) {
if (!preElement) return '';
// Check if there's a span inside the pre, which often holds the actual code lines
const spanInsidePre = preElement.querySelector('span');
if (spanInsidePre) {
let code = '';
spanInsidePre.childNodes.forEach(node => {
if (node.nodeType === Node.TEXT_NODE) {
code += node.textContent;
} else if (node.nodeType === Node.ELEMENT_NODE && node.tagName === 'BR') {
code += '\n';
} else if (node.nodeType === Node.ELEMENT_NODE) {
code += node.textContent;
}
});
const trimmedCodeFromSpan = code.trim();
if (trimmedCodeFromSpan) {
return trimmedCodeFromSpan;
}
}
// Fallback if no span or span processing yielded empty string
return preElement.textContent; // textContent decodes HTML entities
}
function getDirectSiblingParagraphs(element) {
if (!element) {
return '';
}
let description = [];
let sibling = element.nextElementSibling;
while (sibling && (sibling.tagName === 'P' || (sibling.tagName === 'UL' && !sibling.closest('.Documentation-exampleDetails')))) {
if (sibling.tagName === 'P') {
description.push(getCleanText(sibling));
} else if (sibling.tagName === 'UL') {
let listItems = [];
sibling.querySelectorAll('li').forEach(li => listItems.push('- ' + getCleanText(li)));
if (listItems.length > 0) {
description.push(listItems.join('\n'));
}
}
sibling = sibling.nextElementSibling;
}
return description.join('\n\n');
}
function extractExample(detailElement, level = 3) {
const summaryEl = detailElement.querySelector('.Documentation-exampleDetailsHeader');
const exampleBody = detailElement.querySelector('.Documentation-exampleDetailsBody');
let codeContent = '';
if (exampleBody) {
const textareaEl = exampleBody.querySelector('textarea.Documentation-exampleCode.code');
if (textareaEl) {
codeContent = textareaEl.value;
// console.log(`[extractExample] Found textarea for "${getCleanText(summaryEl)}". Value length: ${codeContent.length}. Starts with: ${codeContent.substring(0, 70).replace(/\n/g, '\\n')}`);
}
// If textarea not found or its value is empty, try <pre>
if (!codeContent.trim()) {
const preEl = exampleBody.querySelector('pre.Documentation-exampleCode');
if (preEl) {
codeContent = getCodeFromPre(preEl);
// console.log(`[extractExample] Found pre for "${getCleanText(summaryEl)}". Content length: ${codeContent.length}. Starts with: ${codeContent.substring(0, 70).replace(/\n/g, '\\n')}`);
}
}
if (!codeContent.trim() && !textareaEl && !exampleBody.querySelector('pre.Documentation-exampleCode')) {
// console.warn(`[extractExample] No code element (textarea or pre) found for example: "${getCleanText(summaryEl)}" in body:`, exampleBody.innerHTML.substring(0,200));
}
} else {
// console.warn(`[extractExample] No exampleBody found for example: "${getCleanText(summaryEl)}"`);
}
const outputLabelEl = detailElement.querySelector('.Documentation-exampleOutputLabel');
const outputEl = exampleBody ? exampleBody.querySelector('span.Documentation-exampleOutput, pre.Documentation-exampleOutput') : null;
let exampleText = "";
const title = getCleanText(summaryEl).replace(/ ¶$/, '');
if (title) {
exampleText += `${'#'.repeat(level)} Example: ${title}\n\n`;
} else {
exampleText += `${'#'.repeat(level)} Example\n\n`;
}
const trimmedCode = codeContent.trim();
if (trimmedCode) {
exampleText += "```go\n" + trimmedCode + "\n```\n\n";
} else {
// console.warn(`[extractExample] Code content is effectively empty for: "${title}"`);
}
if (outputLabelEl && outputEl) {
let outputContent = "";
if (outputEl.tagName === 'PRE') {
outputContent = getCodeFromPre(outputEl);
} else {
const preInsideSpan = outputEl.querySelector('pre');
if (preInsideSpan) {
outputContent = getCodeFromPre(preInsideSpan);
} else {
outputContent = getCleanText(outputEl);
}
}
const trimmedOutput = outputContent.trim();
if (trimmedOutput) {
exampleText += `Output:\n\`\`\`\n${trimmedOutput}\n\`\`\`\n\n`;
}
}
return exampleText;
}
function extractNameFromSignatureOrHeader(headerEl, sigPre, entityType = "Unknown") {
if (headerEl) {
const nameAnchor = headerEl.querySelector('a:not(.Documentation-idLink):not(.Documentation-source)');
if (nameAnchor && getCleanText(nameAnchor)) {
return getCleanText(nameAnchor);
}
}
if (sigPre) {
const sigText = getCodeFromPre(sigPre).trim(); // Ensure sigText is trimmed before regex
let match;
switch (entityType) {
case "Function":
case "Constructor":
match = sigText.match(/^func\s+([A-Z_][A-Za-z0-9_]*)\s*\(/);
if (match && match[1]) return match[1];
break;
case "Method":
match = sigText.match(/^func\s*\([\s\S]*?\)\s*([A-Z_][A-Za-z0-9_]*)\s*\(/);
if (match && match[1]) return match[1];
break;
case "Type":
match = sigText.match(/^type\s+([A-Z_][A-Za-z0-9_]*)/);
if (match && match[1]) return match[1];
break;
}
}
if (headerEl) {
let headerText = getCleanText(headerEl).replace(/ ¶$/, '');
headerText = headerText.replace(/^func\s+/, '').replace(/^type\s+/, '');
const firstWord = headerText.split(/\s|\(/)[0];
if (firstWord) return firstWord;
}
return `Unknown${entityType}`;
}
function processDocumentationSection() {
let output = [];
const docContainer = document.querySelector('.Documentation.js-documentation .Documentation-content.js-docContent');
if (!docContainer) {
console.warn("Main documentation content (.Documentation-content.js-docContent) not found.");
return '';
}
const overviewSection = docContainer.querySelector('section.Documentation-overview');
if (overviewSection) {
const overviewHeader = overviewSection.querySelector('h3#pkg-overview');
if (overviewHeader) {
const packageDescription = getDirectSiblingParagraphs(overviewHeader);
if (packageDescription) {
output.push("## Package Overview\n\n" + packageDescription + "\n\n");
}
}
const overviewExamples = overviewSection.querySelectorAll('details.Documentation-exampleDetails');
if (overviewExamples.length > 0) {
let examplesInSectionFound = false;
overviewExamples.forEach(ex => {
const exampleContent = extractExample(ex, 3);
if (exampleContent.split('\n').filter(l => l.trim() !== '').length > 2) { // Check if more than just title
if (!examplesInSectionFound) {
output.push("## Package Examples (from Overview)\n");
examplesInSectionFound = true;
}
output.push(exampleContent);
}
});
}
}
const examplesSectionHeader = docContainer.querySelector('h4#pkg-examples');
if (examplesSectionHeader) {
const examplesList = examplesSectionHeader.parentElement.querySelector('ul.Documentation-examplesList');
if (examplesList) {
let examplesInSectionFound = false;
examplesList.querySelectorAll('li a.js-exampleHref').forEach(exLink => {
const exampleId = exLink.getAttribute('href').substring(1);
const exampleDetail = docContainer.querySelector(`details#${exampleId}.Documentation-exampleDetails`);
if (exampleDetail) {
const exampleContent = extractExample(exampleDetail, 3);
if (exampleContent.split('\n').filter(l => l.trim() !== '').length > 2) {
if (!examplesInSectionFound) {
output.push("## Examples (Listed)\n");
examplesInSectionFound = true;
}
output.push(exampleContent);
}
}
});
}
}
const constHeader = docContainer.querySelector('#pkg-constants');
if (constHeader) {
const constSection = constHeader.closest('h3').nextElementSibling;
if (constSection && constSection.classList.contains('Documentation-constants')) {
const declarations = constSection.querySelectorAll('div.Documentation-declaration');
if (declarations.length > 0) {
output.push("## Constants\n");
declarations.forEach(decl => {
const sigPre = decl.querySelector('pre');
if (sigPre) output.push("```go\n" + getCodeFromPre(sigPre).trim() + "\n```\n");
const desc = getDirectSiblingParagraphs(decl);
if (desc) output.push(desc + "\n");
output.push("---\n");
});
}
}
}
const varHeader = docContainer.querySelector('#pkg-variables');
if (varHeader) {
const varSection = varHeader.closest('h3').nextElementSibling;
if (varSection && varSection.classList.contains('Documentation-variables')) {
const declarations = varSection.querySelectorAll('div.Documentation-declaration');
if (declarations.length > 0) {
output.push("## Variables\n");
declarations.forEach(decl => {
const sigPre = decl.querySelector('pre');
if (sigPre) output.push("```go\n" + getCodeFromPre(sigPre).trim() + "\n```\n");
const desc = getDirectSiblingParagraphs(decl);
if (desc) output.push(desc + "\n");
output.push("---\n");
});
}
}
}
const funcHeader = docContainer.querySelector('#pkg-functions');
if (funcHeader) {
const funcSection = funcHeader.closest('h3').nextElementSibling;
if (funcSection && funcSection.classList.contains('Documentation-functions')) {
const functions = funcSection.querySelectorAll('div.Documentation-function');
if (functions.length > 0) {
output.push("## Functions\n");
functions.forEach(fnDiv => {
const fnHeaderEl = fnDiv.querySelector('h4.Documentation-functionHeader');
const declarationDiv = fnDiv.querySelector('div.Documentation-declaration');
const sigPre = declarationDiv ? declarationDiv.querySelector('pre') : null;
const funcName = extractNameFromSignatureOrHeader(fnHeaderEl, sigPre, "Function");
output.push(`### Function: ${funcName}\n`);
if (sigPre) {
output.push("```go\n" + getCodeFromPre(sigPre).trim() + "\n```\n");
}
const desc = declarationDiv ? getDirectSiblingParagraphs(declarationDiv) : (fnHeaderEl ? getDirectSiblingParagraphs(fnHeaderEl) : '');
if (desc) output.push(desc + "\n");
fnDiv.querySelectorAll('details.Documentation-exampleDetails').forEach(ex => {
const exampleContent = extractExample(ex, 4);
if (exampleContent.split('\n').filter(l => l.trim() !== '').length > 2) {
output.push(exampleContent);
}
});
output.push("---\n");
});
}
}
}
const typeHeader = docContainer.querySelector('#pkg-types');
if (typeHeader) {
const typeSection = typeHeader.closest('h3').nextElementSibling;
if (typeSection && typeSection.classList.contains('Documentation-types')) {
const types = typeSection.querySelectorAll('div.Documentation-type');
if (types.length > 0) {
output.push("## Types\n");
types.forEach(typeDiv => {
const typeHeaderEl = typeDiv.querySelector('h4.Documentation-typeHeader');
const typeDeclarationDiv = typeDiv.querySelector('div.Documentation-declaration');
const sigPre = typeDeclarationDiv ? typeDeclarationDiv.querySelector('pre') : null;
const typeName = extractNameFromSignatureOrHeader(typeHeaderEl, sigPre, "Type");
output.push(`### Type: ${typeName}\n`);
if (sigPre) {
output.push("```go\n" + getCodeFromPre(sigPre).trim() + "\n```\n");
}
const desc = typeDeclarationDiv ? getDirectSiblingParagraphs(typeDeclarationDiv) : (typeHeaderEl ? getDirectSiblingParagraphs(typeHeaderEl) : '');
if (desc) output.push(desc + "\n");
typeDiv.querySelectorAll(':scope > details.Documentation-exampleDetails').forEach(ex => {
const exampleContent = extractExample(ex, 4);
if (exampleContent.split('\n').filter(l => l.trim() !== '').length > 2) {
output.push(exampleContent);
}
});
typeDiv.querySelectorAll('div.Documentation-typeFunc').forEach(assocFnDiv => {
const assocFnHeaderEl = assocFnDiv.querySelector('h4.Documentation-functionHeader');
const assocFnDeclarationDiv = assocFnDiv.querySelector('div.Documentation-declaration');
const assocSigPre = assocFnDeclarationDiv ? assocFnDeclarationDiv.querySelector('pre') : null;
const constructorName = extractNameFromSignatureOrHeader(assocFnHeaderEl, assocSigPre, "Constructor");
output.push(`#### Constructor: ${constructorName}\n`);
if (assocSigPre) {
output.push("```go\n" + getCodeFromPre(assocSigPre).trim() + "\n```\n");
}
const assocDesc = assocFnDeclarationDiv ? getDirectSiblingParagraphs(assocFnDeclarationDiv) : (assocFnHeaderEl ? getDirectSiblingParagraphs(assocFnHeaderEl) : '');
if (assocDesc) output.push(assocDesc + "\n");
assocFnDiv.querySelectorAll('details.Documentation-exampleDetails').forEach(ex => {
const exampleContent = extractExample(ex, 5);
if (exampleContent.split('\n').filter(l => l.trim() !== '').length > 2) {
output.push(exampleContent);
}
});
output.push("---\n");
});
typeDiv.querySelectorAll('div.Documentation-typeMethod').forEach(assocMethodDiv => {
const assocMethodHeaderEl = assocMethodDiv.querySelector('h4.Documentation-functionHeader');
const assocMethodDeclarationDiv = assocMethodDiv.querySelector('div.Documentation-declaration');
const assocSigPre = assocMethodDeclarationDiv ? assocMethodDeclarationDiv.querySelector('pre') : null;
const methodName = extractNameFromSignatureOrHeader(assocMethodHeaderEl, assocSigPre, "Method");
output.push(`#### Method: ${methodName}\n`);
if (assocSigPre) {
output.push("```go\n" + getCodeFromPre(assocSigPre).trim() + "\n```\n");
}
const assocDesc = assocMethodDeclarationDiv ? getDirectSiblingParagraphs(assocMethodDeclarationDiv) : (assocMethodHeaderEl ? getDirectSiblingParagraphs(assocMethodHeaderEl) : '');
if (assocDesc) output.push(assocDesc + "\n");
assocMethodDiv.querySelectorAll('details.Documentation-exampleDetails').forEach(ex => {
const exampleContent = extractExample(ex, 5);
if (exampleContent.split('\n').filter(l => l.trim() !== '').length > 2) {
output.push(exampleContent);
}
});
output.push("---\n");
});
output.push("===\n");
});
}
}
}
let cleanedOutput = output.join('\n')
.replace(/(\n---\n)+(\s*(\n---|\n===|$))/g, '\n---\n$2') // Consolidate multiple --- unless followed by ===
.replace(/(\n===\n)+/g, '\n===\n') // Consolidate multiple ===
.replace(/\n{3,}/g, '\n\n'); // Max 2 blank lines
return cleanedOutput.trim();
}
function getPackageNameForFilename() {
let path = window.location.pathname;
path = path.split('@')[0];
if (path.startsWith('/')) {
path = path.substring(1);
}
return path.replace(/\/$/, '').replace(/\//g, '_');
}
function download(filename, text) {
const element = document.createElement('a');
element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
element.setAttribute('download', filename);
element.style.display = 'none';
document.body.appendChild(element);
element.click();
document.body.removeChild(element);
}
function initializeScraper() {
// console.log("Starting extraction...");
const data = processDocumentationSection();
if (data.trim()) {
const packageName = getPackageNameForFilename();
const filename = packageName ? `${packageName}_llm.txt` : 'llm.txt';
download(filename, data);
// console.log(`${filename} download initiated.`);
// GM_setClipboard(data); // For debugging
// alert('Data extracted and download initiated!');
} else {
// console.warn("No documentation section found or no actual data was extracted.");
alert("Could not find documentation section or no actual data was extracted. Check console for details (if any logs were enabled).");
}
}
const downloadButton = document.createElement('button');
downloadButton.textContent = 'Download llm.txt';
downloadButton.className = 'llm-download-button';
downloadButton.addEventListener('click', () => {
// console.log("Button clicked, scheduling scraper with 1s delay.");
setTimeout(initializeScraper, 1000); // 1 second delay
});
// Fallback: if the page is very simple and loads fast, or if the button is added very late
// For very dynamic pages, a MutationObserver on document.body or a specific container might be more robust
// but setTimeout is simpler for now.
if (document.readyState === "complete") {
// If page is already loaded, maybe CodeMirror is also ready?
// This is less likely to be the case for why it's not working.
// The click handler with setTimeout is more reliable.
}
document.body.appendChild(downloadButton);
})();
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