When copying or moving files, it's common for operating systems to automatically add an increment or 'copy' to duplicate file names. This does that for Node.js applications, with automatic platform detection and support for Linux, MacOs, and Windows conventions.

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Install with npm (requires Node.js >=8):

$ npm install --save add-filename-increment

When copying files, it's common for operating systems to append a numerical increment or the word 'copy' to a file name to prevent the existing file from being overwritten.

This library allows you to do the same thing in your Node.js application, using the correct conventions for the most commonly used operating systems.

All methods automatically detect the platform to use, unless platform is defined on the options.

const increment = require('add-filename-increment');

The main export is a function that adds a trailing increment to the stem (basename without extension) of the given file path or object.

Params

• file {String|Object}: If the file is an object, it must have a path property.
• options {Object}: See available options.
• returns {String|Object}: Returns a file of the same type that was given, with an increment added to the file name.

Example

console.log(increment('foo/bar.txt', { platform: 'darwin' }));
//=> foo/bar copy.txt
console.log(increment('foo/bar.txt', { platform: 'linux' }));
//=> foo/bar (copy).txt
console.log(increment('foo/bar.txt', { platform: 'win32' }));
//=> foo/bar (2).txt

Add a trailing increment to the given filepath.

Params

• filepath {String}
• options {Object}: See available options.
• returns {String}

Example

console.log(increment.path('foo/bar.txt', { platform: 'darwin' }));
//=> foo/bar copy.txt
console.log(increment.path('foo/bar.txt', { platform: 'linux' }));
//=> foo/bar (copy).txt
console.log(increment.path('foo/bar.txt', { platform: 'win32' }));
//=> foo/bar (2).txt

Add a trailing increment to the file.base of the given file object.

Params

• file {String|Object}: If passed as a string, the path will be parsed to create an object using path.parse().
• options {Object}: See available options.
• returns {Object}: Returns an object.

Example

console.log(increment.file({ path: 'foo/bar.txt' }, { platform: 'darwin' }));
//=> { path: 'foo/bar copy.txt', base: 'bar copy.txt' }
console.log(increment.file({ path: 'foo/bar.txt' }, { platform: 'linux' }));
//=> { path: 'foo/bar (copy).txt', base: 'bar (copy).txt' }
console.log(increment.file({ path: 'foo/bar.txt' }, { platform: 'win32' }));
//=> { path: 'foo/bar (2).txt', base: 'bar (2).txt' }

Returns an ordinal-suffix for the given number. This is used when creating increments for files on Linux.

Params

• num {Number}
• returns {String}

Example

const { ordinal } = require('add-filename-increment');
console.log(ordinal(1)); //=> 'st'
console.log(ordinal(2)); //=> 'nd'
console.log(ordinal(3)); //=> 'rd'
console.log(ordinal(110)); //=> 'th'

Returns an ordinal for the given number.

Params

• num {Number}
• returns {String}

Example

const { toOrdinal } = require('add-filename-increment');
console.log(toOrdinal(1)); //=> '1st'
console.log(toOrdinal(2)); //=> '2nd'
console.log(toOrdinal(3)); //=> '3rd'
console.log(toOrdinal(110)); //=> '110th'

Description: Check the file system, and automatically increment the file based on existing files. Thus, if the file name is foo.txt, and foo (2).txt already exists, the file will automatically be renamed to foo (3).txt.

Also uses the correct conventions for Linux, Windows (win32), and MacOS (darwin).

Type: boolean

Default: undefined

Description: Custom function to handling incrementing a file name. This is mostly useful when options.fs is also defined, since this function will only be called if a file name needs to be incremented, allowing you to control how incrementing is done.

Type: function

Default: undefined

Description: Specify the platform conventions to use.

Type: string

Default: Uses process.platform. Valid values are linux, win32, and darwin.

• Linux
• MacOS
• Windows

Supported Operating Systems

Currently Windows, Darwin (MacOS), and Linux are supported. This library attempts to automatically use the correct conventions for each operating system. Please create an issue if you ecounter a bug.

If you use an operating system with different conventions, and you would like for this library to add support, please create an issue with a detailed description of those conventions, or feel free to do a pull request.

When a file is copied or moved, and the destination file path already exists, Linux uses the following conventions for incrementing the file name.

¹ On Linux, when a file or folder is copied or moved to a different directory and another file or folder with the same name exists in that directory, you are prompted to choose a new name for the file or folder, or to cancel or skip the operation.

When a file is copied or moved, and the destination file path already exists, MacOS uses the following conventions for incrementing the file name.

¹ MacOS uses different conventions for incrementing file names when the source file is copied, moved or renamed to a different directory, versus when the file is copied into the same directory.

When a file is copied or moved, and the destination file path already exists, Windows uses the following conventions for incrementing the file name.

¹ Windows uses different conventions for incrementing file names when the source file is copied, moved or renamed to a different directory, versus when the file is copied into the same directory. Also, when a folder is copied to a new directory, and the new directory already has a folder with the same name, Windows just merges the folders automatically.

$ npm install && npm test

$ npm install -g verbose/verb#dev verb-generate-readme && verb

You might also be interested in these projects:

• micromatch: Glob matching for javascript/node.js. A replacement and faster alternative to minimatch and multimatch. | homepage
• strip-filename-increment: Operating systems commonly add a trailing increment, or the word 'copy', or something similar to… more | homepage
• write: Write data to a file, replacing the file if it already exists and creating any… more | homepage

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Copyright © 2019, Jon Schlinkert. Released under the MIT License.

This file was generated by verb-generate-readme, v0.8.0, on September 04, 2019.