alinex-fs/lib/method/tempfile.js

Extension of nodes filesystem tools.

/*
Temp File
=================================================
This will create a new temporary file for you. Like in [`tempdir()`](tempdir.coffee)
you may give a specific path and prefix before the numeral file part.

Examples
-------------------------------------------------

You may get a file back without doing anything:

``` coffee
fs = require 'alinex-fs'
fs.tempfile (err, dir) ->
  console.log "Temporary file is: " + dir
```

But don't forget to remove it if no longer needed.
 */

(function() {
  var crypto, fs, os, path, tempfile, tempfileSync;

  fs = require('fs');

  path = require('path');

  crypto = require('crypto');

  os = require('os');


  /*
  @param {String} base path under which the directory should be created (use `null`
  to make it in the os default directory)
  @param {String} [prefix=process title] to use before numerical part
  @param {function(<Error>, <String>)} cb callback with `Error` or the path to the newly created file
   */

  tempfile = module.exports.tempfile = function(base, prefix, cb) {
    var file;
    if (prefix == null) {
      prefix = null;
    }
    if ((cb == null) && typeof prefix === 'function') {
      cb = prefix;
      prefix = null;
    }
    if ((cb == null) && typeof base === 'function') {
      cb = base;
      base = null;
    }
    if (base == null) {
      base = os.tmpDir();
    }
    if (prefix == null) {
      prefix = path.basename(process.title + '-');
    }
    file = path.join(base, prefix + crypto.randomBytes(4).readUInt32LE(0));
    return fs.open(file, 'wx', function(err, fd) {
      if ((err != null ? err.code : void 0) === 'EEXIST') {
        return tempfile(base, prefix, cb);
      }
      if (err) {
        return cb(err);
      }
      return fs.close(fd, function() {
        return cb(null, file);
      });
    });
  };


  /*
  @param {String} {base=os settings} path under which the directory should be created
  @param {String} [prefix=process title] to use before numerical part
  @return {String} the path to the newly created directory
  @throws {Error} if something went wrong
   */

  tempfileSync = module.exports.tempfileSync = function(base, prefix) {
    var error, file;
    if (prefix == null) {
      prefix = null;
    }
    if (base == null) {
      base = os.tmpDir();
    }
    if (prefix == null) {
      prefix = path.basename(process.title + '-');
    }
    file = path.join(base, prefix + crypto.randomBytes(4).readUInt32LE(0));
    try {
      fs.closeSync(fs.openSync(file, 'wx'));
      return file;
    } catch (error1) {
      error = error1;
      if (error.code === 'EEXIST') {
        return tempfileSync(base, prefix);
      }
      throw error;
    }
  };

}).call(this);

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