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Viewing file:     tempdir.js (2.2 KB)      -rw-r--r--

var common = require('./common');
var os = require('os');
var fs = require('fs');

common.register('tempdir', _tempDir, {
  allowGlobbing: false,
  wrapOutput: false,
});

// Returns false if 'dir' is not a writeable directory, 'dir' otherwise
function writeableDir(dir) {
  if (!dir || !fs.existsSync(dir)) return false;

  if (!common.statFollowLinks(dir).isDirectory()) return false;

  var testFile = dir + '/' + common.randomFileName();
  try {
    fs.writeFileSync(testFile, ' ');
    common.unlinkSync(testFile);
    return dir;
  } catch (e) {
    /* istanbul ignore next */
    return false;
  }
}

// Variable to cache the tempdir value for successive lookups.
var cachedTempDir;

//@
//@ ### tempdir()
//@
//@ Examples:
//@
//@ ```javascript
//@ var tmp = tempdir(); // "/tmp" for most *nix platforms
//@ ```
//@
//@ Searches and returns string containing a writeable, platform-dependent temporary directory.
//@ Follows Python's [tempfile algorithm](http://docs.python.org/library/tempfile.html#tempfile.tempdir).
function _tempDir() {
  if (cachedTempDir) return cachedTempDir;

  cachedTempDir = writeableDir(os.tmpdir()) ||
                  writeableDir(process.env.TMPDIR) ||
                  writeableDir(process.env.TEMP) ||
                  writeableDir(process.env.TMP) ||
                  writeableDir(process.env.Wimp$ScrapDir) || // RiscOS
                  writeableDir('C:\\TEMP') || // Windows
                  writeableDir('C:\\TMP') || // Windows
                  writeableDir('\\TEMP') || // Windows
                  writeableDir('\\TMP') || // Windows
                  writeableDir('/tmp') ||
                  writeableDir('/var/tmp') ||
                  writeableDir('/usr/tmp') ||
                  writeableDir('.'); // last resort

  return cachedTempDir;
}

// Indicates if the tempdir value is currently cached. This is exposed for tests
// only. The return value should only be tested for truthiness.
function isCached() {
  return cachedTempDir;
}

// Clears the cached tempDir value, if one is cached. This is exposed for tests
// only.
function clearCache() {
  cachedTempDir = undefined;
}

module.exports.tempDir = _tempDir;
module.exports.isCached = isCached;
module.exports.clearCache = clearCache;