k-gun-fileinfo/src/file-info.js

File info like PHP's finfo for Node.js.

/**
 * Copyright (c) 2015 Kerem Güneş
 *   <k-gun@mail.com>
 *
 * The MIT License
 *   <http://opensource.org/licenses/MIT>
 */

/**
 * Module objects.
 * @private
 */
var fs = require("fs");
var execSync = require("k-gun-execsync");

/**
 * File info.
 * @public
 *
 * @param  {String} file
 * @return {Object|void}
 */
function fileInfo(file) {
   var stat;

   // check file exists also getting stat
   try {
      stat = fs.statSync(file);
   } catch (e) { return; }

   var name, directory, extension, mime, charset, i;

   // detect name & directory
   if ((i = file.lastIndexOf("/")) > 0) {
      name = file.substr(i + 1);
      directory = file.substr(0, i + 1);
   } else {
      name = file;
      directory = "./";
   }

   // detect extension ignoring .dot files
   if ((i = file.lastIndexOf(".")) > 0 && name.charAt(0) != ".") {
      extension = file.substr(i + 1);
   }

   // run a shell command that gets file info
   var ret = execSync("file -i '"+ file +"' | awk '{print $2} {print $3}'");
   if (ret == "") {
      return;
   }

   ret = ret.trim().split("\n");
   if (ret.length == 2) {
      // detect mime removing comma-end
      mime = (ret[0].lastIndexOf(";") > -1)
         ? ret[0].trim().substr(0, ret[0].length - 1) : ret[0];
      // detect charset
      charset = ret[1].trim().split("=")[1];
   }

   // return stack!
   return {
      name: name,
      directory: directory,
      extension: extension,
      mime: mime,
      charset: charset,
      stat: stat
   };
}

/**
 * Expose module.
 */
module.exports = fileInfo;