fsu

#fsu (fs unique) Unique filenames with streams support

Checking if a file exists before opening is an anti-pattern that leaves you vulnerable to race conditions: another process can remove the file between the calls to fs.exists() and fs.open(). This functions doesn't use fs.exists functionality. If file doesn't exist this will work like usual fs module methods

##Instalation npm install fsu

openUnique(path, [mode], callback)

Same as fs.open but open for writing and creates unique filename.

var fsu = require('fsu');

fsu.openUnique("text{_###}.txt", function(err, fd) {
    //now we can use file descriptor as usual
});

writeFileUnique(path, data, [options], callback)

Same as fs.writeFile but creates unique filename.

var fsu = require('fsu');

fsu.writeFileUnique("text{_###}.txt", "test", function(err) {
    console.log("Done");
});

createUniqueWriteStream(path, [options])

Same as fs.createReadStream but returns writable stream for unique file.

var fsu = require('fsu');
var stream = fsu.createUniqueWriteStream("text{_###}.txt");

pattern

You must use {#} pattern in filename and path. All # characters will be change with counter for existing files. Number of # means padding for unique counter

If we run second example several times filenames will be

text.txt
text_001.txt
text_002.txt

License: MIT