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122 lines
3.6 KiB
TypeScript
122 lines
3.6 KiB
TypeScript
import Fontmin from 'fontmin';
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import { copy } from 'fs-extra';
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import { mkdir, readdir, readFile, writeFile } from 'fs/promises';
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import { dirname, extname, join } from 'path';
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/** 需要经 fontmin 做字形子集化的字体扩展名 */
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const FONT_EXTENSIONS = ['.ttf', '.otf', '.woff', '.woff2'];
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export interface IContentBuildOptions {
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/** content 素材的源目录 */
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readonly sourceDir: string;
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/** content 素材的输出目录 */
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readonly outputDir: string;
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/** 参与字体子集化的全部字符 */
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readonly chars: string;
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}
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export interface IContentBuildStats {
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/** 处理的文件总数 */
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readonly files: number;
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/** 压缩的 jsonc 文件数 */
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readonly jsonc: number;
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/** 压缩的字体文件数 */
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readonly fonts: number;
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}
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interface IContentBuildCounter {
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files: number;
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jsonc: number;
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fonts: number;
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}
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/**
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* 将 jsonc 文本压缩为单行纯 JSON，按行去掉全部 `//` 注释与系统标记行。
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* @param text jsonc 原文
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*/
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export function minifyJSONC(text: string): string {
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const body = text
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.split(/\r?\n/)
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.filter(line => !line.trim().startsWith('//'))
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.join('\n');
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return JSON.stringify(JSON.parse(body));
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}
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/**
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* 将单个字体文件按给定字符集做字形子集化，输出到目标目录并保留原文件名。
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* @param source 字体源文件
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* @param target 目标文件路径
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* @param chars 参与子集化的全部字符
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*/
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async function compressFont(source: string, target: string, chars: string) {
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const fontmin = new Fontmin();
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const glyph = Fontmin.glyph({ text: chars });
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await fontmin.src(source).dest(dirname(target)).use(glyph).runAsync();
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}
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/**
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* 递归处理目录：jsonc 压缩为纯 JSON，字体做子集化，其它素材原样拷贝。
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* @param sourceDir 源目录
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* @param outputDir 输出目录
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* @param chars 参与字体子集化的全部字符
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* @param counter 统计计数器
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*/
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async function processDirectory(
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sourceDir: string,
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outputDir: string,
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chars: string,
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counter: IContentBuildCounter
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) {
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await mkdir(outputDir, { recursive: true });
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const entries = await readdir(sourceDir, { withFileTypes: true });
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for (const entry of entries) {
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const source = join(sourceDir, entry.name);
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const target = join(outputDir, entry.name);
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if (entry.isDirectory()) {
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await processDirectory(source, target, chars, counter);
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continue;
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}
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const extension = extname(entry.name);
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if (extension === '.jsonc') {
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const text = await readFile(source, 'utf-8');
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await writeFile(target, minifyJSONC(text), 'utf-8');
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counter.jsonc += 1;
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} else if (FONT_EXTENSIONS.includes(extension)) {
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await compressFont(source, target, chars);
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counter.fonts += 1;
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} else {
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await copy(source, target);
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}
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counter.files += 1;
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}
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}
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/**
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* 将 content 素材从源目录构建到输出目录，jsonc 压缩为纯 JSON，字体做子集化。
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* @param options 构建选项
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*/
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export async function buildContent(
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options: IContentBuildOptions
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): Promise<IContentBuildStats> {
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const counter: IContentBuildCounter = { files: 0, jsonc: 0, fonts: 0 };
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await processDirectory(
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options.sourceDir,
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options.outputDir,
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options.chars,
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counter
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);
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if (counter.fonts === 0) {
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process.stdout.write('⚠️ 未找到可压缩的字体文件，已跳过字体压缩\r\n');
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}
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return {
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files: counter.files,
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jsonc: counter.jsonc,
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fonts: counter.fonts
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};
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}
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