99 lines
3.1 KiB
JavaScript
99 lines
3.1 KiB
JavaScript
#!/usr/bin/env node
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/**
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* export_deck_pdf.mjs — 把多文件 slide deck 导出为单个矢量 PDF
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*
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* 用法：
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* node export_deck_pdf.mjs --slides <dir> --out <file.pdf> [--width 1920] [--height 1080]
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*
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* 特点：
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* - 文字保留矢量（可复制、可搜索）
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* - 背景/图形 1:1 保真（Playwright 内嵌 Chromium 渲染）
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* - 不需要对 HTML 做任何改造
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* - 视觉损失 = 0（PDF 就是浏览器打印出来的）
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*
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* trade-off：
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* - PDF 不可再编辑文字（要改回到 HTML 改）
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*
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* 依赖：playwright pdf-lib
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* npm install playwright pdf-lib
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*
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* 会按文件名排序（01-xxx.html → 02-xxx.html → ...）
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*/
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import { chromium } from 'playwright';
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import { PDFDocument } from 'pdf-lib';
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import fs from 'fs/promises';
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import path from 'path';
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function parseArgs() {
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const args = { width: 1920, height: 1080 };
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const a = process.argv.slice(2);
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for (let i = 0; i < a.length; i += 2) {
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const k = a[i].replace(/^--/, '');
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args[k] = a[i + 1];
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}
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if (!args.slides || !args.out) {
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console.error('用法: node export_deck_pdf.mjs --slides <dir> --out <file.pdf> [--width 1920] [--height 1080]');
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process.exit(1);
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}
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args.width = parseInt(args.width);
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args.height = parseInt(args.height);
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return args;
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}
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async function main() {
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const { slides, out, width, height } = parseArgs();
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const slidesDir = path.resolve(slides);
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const outFile = path.resolve(out);
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const files = (await fs.readdir(slidesDir))
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.filter(f => f.endsWith('.html'))
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.sort();
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if (!files.length) {
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console.error(`No .html files found in ${slidesDir}`);
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process.exit(1);
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}
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console.log(`Found ${files.length} slides in ${slidesDir}`);
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const browser = await chromium.launch();
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const ctx = await browser.newContext({ viewport: { width, height } });
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// 1) Render each HTML to its own PDF buffer
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const pageBuffers = [];
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for (const f of files) {
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const page = await ctx.newPage();
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const url = 'file://' + path.join(slidesDir, f);
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await page.goto(url, { waitUntil: 'networkidle' }).catch(() => page.goto(url));
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await page.waitForTimeout(1200); // web-font paint
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// emulate "screen" so CSS colors/backgrounds render the same as browser
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await page.emulateMedia({ media: 'screen' });
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const buf = await page.pdf({
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width: `${width}px`,
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height: `${height}px`,
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printBackground: true,
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margin: { top: 0, right: 0, bottom: 0, left: 0 },
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preferCSSPageSize: false,
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});
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pageBuffers.push(buf);
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await page.close();
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console.log(` [${pageBuffers.length}/${files.length}] ${f}`);
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}
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await browser.close();
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// 2) Merge into a single PDF
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const merged = await PDFDocument.create();
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for (const buf of pageBuffers) {
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const src = await PDFDocument.load(buf);
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const copied = await merged.copyPages(src, src.getPageIndices());
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copied.forEach(p => merged.addPage(p));
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}
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const bytes = await merged.save();
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await fs.writeFile(outFile, bytes);
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const kb = (bytes.byteLength / 1024).toFixed(0);
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console.log(`\n✓ Wrote ${outFile} (${kb} KB, ${files.length} pages, vector)`);
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}
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main().catch(e => { console.error(e); process.exit(1); });
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