Hexo使用技巧：使用Node.js实现批量替换图片链接前缀

/**
 * 替换文件夹下所有md文件的图片链接
 */
const path = require('path');
const fs = require('fs');

const addImageUrlPreffix = (dirName, preffix = '/images') => {
    // 过滤非.md
    let fileNames = fs.readdirSync(dirName).filter(val => {
        return /[\w|\W]*\.md/.test(val);
    });

    for (let fName of fileNames) {
        let fileStr = fs.readFileSync(`${dirName}/${fName}`).toString();
        let fileStrBak = fileStr;
        let urls = [];
        let beginAt = 0;
        let endAt = 0;
        let matchResult;

        // 查找图片链接
        while (matchResult = fileStr.match(/(!\[[\w|\W]*?\]\()(\/?[\w|\W]*?)(\))/)) {
            let firstBlock = matchResult[1];
            let imgUrl = matchResult[2];
            beginAt = endAt + matchResult.index + firstBlock.length;
            endAt = beginAt + imgUrl.length;

            fileStr = fileStr.substr(matchResult.index + firstBlock.length + imgUrl.length, fileStr.length);

            // 加上绝对路径
            if (!/^\//.test(imgUrl)) {
                imgUrl = `/${imgUrl}`;
            }

            urls.push({
                imgUrl,
                beginAt,
                endAt
            });
        }

        if (urls.length == 0) continue;

        // 从字符串尾部写上来
        urls.reverse();

        // 批量替换
        for (let { imgUrl, beginAt, endAt }
            of urls) {
            let str1 = fileStrBak.substr(0, beginAt);
            let str2 = fileStrBak.substr(endAt, fileStrBak.length);
            fileStrBak = str1 + preffix + imgUrl + str2;
        }

        // 写入文件
        fs.writeFileSync(`${dirName}/${fName}`, fileStrBak);
        console.log(`${dirName}/${fName}, number: ${urls.length}`);
    }
}


const dPath = path.resolve(__dirname, './source/_drafts');
const pPath = path.resolve(__dirname, './source/_posts');

addImageUrlPreffix(dPath);
addImageUrlPreffix(pPath);