ディレクトリを再帰的に走査してExif情報を元にファル名を「日時_モデル名_元ファイル名」に変更する

ExifRename.js

/* global process */

var fs = require('fs');
var path = require("path");
var ExifImage = require('exif').ExifImage;

var baseImgDir = process.argv[2] || '.';

function walk(imgDir, callback) {
    fs.readdir(imgDir, function (err, files) {
        if (err) {
            callback(err, null, null);
            return;
        }

        files.forEach(function (fileName) {
            var fp = path.join(imgDir, fileName);
            if (fs.statSync(fp).isDirectory()) {
                console.log('Directory: ' + fp);
                walk(fp, callback);
            } else {
                callback(null, imgDir, fileName);
            }
        });
    });
}

function imgFileRename(imgDir, fileName) {
    var newfilename = '';
    var fp = path.join(imgDir, fileName);
    var newfp;

    new ExifImage({ image: fp }, function (err, image) {
        if (err) {
            console.log(fp);
            console.log('ExifImageError: ' + err.message);
            return;
        }

        newfilename = image.exif.CreateDate.replace(/:/g, '').replace(/ /g, '_');
        newfilename += '_' + image.image.Model.replace(/ /g, '');
        newfilename += '_' + fileName.replace('.JPG', '.jpg');
        newfp = path.join(imgDir, newfilename);

        fs.rename(fp, newfp, function (err) {
            if (err) {
                console.log(fp);
                console.log('renameError: ' + err);
                return;
            }
            console.log(fp + ' to ' + newfilename);
            console.log('renamed complete');
        });
    });
}

walk(baseImgDir, function (err, imgDir, fileName) {
    if (err) {
        console.log('walkError: ' + err);
        return;
    }

    if (fileName.indexOf('20') !== 0 && fileName.slice(-4) === '.JPG') {
        imgFileRename(imgDir, fileName);
    } else {
        var fp = path.join(imgDir, fileName);
        console.log(fp + ' no rename');
    }
});

参考
http://shimz.me/blog/node-js/2601
http://qiita.com/amay077/items/cc6ee3e66040a5097230