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