Hexo插件，将图片转换为webp格式

hexo-webp-convert.js

const path = require('path');
const sharp = require('sharp');
var fs = require('hexo-fs');

//检测文章内的图片，将不是webp格式的图片转换为webp格式
hexo.extend.filter.register('before_post_render', function(data){
    var log = this.log;
    const title = data.title;
    log.i("WebP Convert Filter: " + title);
    const convertImages = new Set();
    // detect ![]() pattern and convert path
    let raw = data.raw.replace(/!\[([^\[\]]*)\]\((.*?)\s?(?:".*")?\)/g,
        function(match_str, label, imagePath){
            if(!imagePath) return match_str;
            const imageExt = path.extname(imagePath);
            if (imageExt !== '.webp') {
                let imageFullPath;
                if(imagePath.startsWith('/')) {
                    imageFullPath = path.join(data.full_source.substring(0, 
                        data.full_source.lastIndexOf('source' + path.sep) + ('source' + path.sep).length), imagePath);
                } else {
                    imageFullPath = path.resolve(data.full_source.substring(0, data.full_source.lastIndexOf(path.sep)), imagePath);
                }
                imageFullPath = decodeURIComponent(imageFullPath);
                if (!fs.existsSync(imageFullPath)) {
                    log.i("Image file does not exist: " + imageFullPath);
                    return match_str;
                }
                if (!convertImages.has(imageFullPath)) {
                    convertImages.add(imageFullPath);
                    log.i("Markdown Image Path: " + imageFullPath);
                    sharp(imageFullPath)
                        .toFormat('webp')
                        .toFile(imageFullPath.replace(imageExt, '.webp'))
                        .then(() => {
                            fs.unlink(imageFullPath, (err) => {
                                if (err) {
                                    log.e(`Error deleting original image: ${err}`);
                                } else {
                                    log.i(`Original image deleted: ${imagePath}`);
                                }
                            });
                        })
                        .catch((err) => {
                            console.error(`Error converting [${title}] image [${imageFullPath}] to webp: ${err}`);
                        });
                } else {
                    log.i("Already converted: " + imageFullPath);
                }
                return match_str.replace(imageExt, '.webp');
            }
            return match_str;
        });
    if (raw !== data.raw) {
        data.raw = raw;
        fs.writeFile(data.full_source, raw, (err) => {
            if (err) {
                log.e(`Error writing raw to file: ${err}`);
            } else {
                log.i(`raw written to file: ${data.full_source}`);
            }
        });
    }
    return data;
}, 9);