# TTY::Which [![Gitter](https://badges.gitter.im/Join%20Chat.svg)][gitter]

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[gitter]: https://gitter.im/piotrmurach/tty
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> Platform independent implementation of Unix `which` utility that searches for executable file in the path variable.

**TTY::Which** provides cross-platform executables search component for [TTY](https://github.com/piotrmurach/tty) toolkit.

## Installation

Add this line to your application's Gemfile:

    gem 'tty-which'

And then execute:

    $ bundle

Or install it yourself as:

    $ gem install tty-which

## Usage

**TTY::Which** has `which` method that searches set of directories for an executable file based on the `PATH` environment variable.

When the path to an executable program exists, an absolute path is returned, otherwise `nil`.

For example, to find location for an executable program do:

```ruby
TTY::Which.which('less')  # => '/usr/bin/less'
TTY::Which.which('git')   # => 'C:\Program Files\Git\bin\git'
```

You can also check an absolute path to executable:

```ruby
TTY::Which.which('/usr/bin/ruby')  # => '/usr/bin/ruby'
```

You can also specify directly the paths to search using `:paths` keyword:

```ruby
TTY::Which.which('ruby', paths: ['/usr/local/bin', '/usr/bin', '/bin'])
# => '/usr/local/bin/ruby'
```

When you're only interesting in knowing that an executable exists on the system use the `exist?` call:

```ruby
TTY::Which.exist?('ruby') # => true
```

## Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/piotrmurach/tty-which. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.

1. Fork it ( https://github.com/piotrmurach/tty-which/fork )
2. Create your feature branch (`git checkout -b my-new-feature`)
3. Commit your changes (`git commit -am 'Add some feature'`)
4. Push to the branch (`git push origin my-new-feature`)
5. Create a new Pull Request

## Copyright

Copyright (c) 2015 Piotr Murach. See LICENSE for further details.
