# tty-truncate

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Truncate a string to the current text terminal width

```javascript
const ttyTruncate = require('tty-truncate');

const str = '4724e053261747b278049de678b1ed';

process.stdout.columns; //=> 30
ttyTruncate(str); //=> '4724e053261747b278049de678b1ed'

process.stdout.columns; //=> 20
ttyTruncate(str); //=> '4724e053261747b2780…'
```

## Installation

[Use](https://docs.npmjs.com/cli/install) [npm](https://docs.npmjs.com/getting-started/what-is-npm).

```
npm install tty-truncate
```

## API

```javascript
const ttyTruncate = require('tty-truncate');
```

### ttyTruncate(*input*)

*input*: `string` (single-line string)  
Return: `string`

It replaces overflowing text with a single `…`.

Note that this module works only when `process.stdout.isTTY` is `true`. In a non-TTY environment it always throws an error.

```javascript
const ttyTruncate = require('tty-truncate');

console.log(process.stdout.isTTY === true);

try {
  console.log(ttyTruncate('example'));
} catch ({message}) {
  console.log(message);
}
```

```
$ node example.js
> true
> example

$ node example.js | echo -n
> false
> tty-truncate doesn't support non-TTY environments.
```

## License

[ISC License](./LICENSE) © 2018 - 2019 Watanabe Shinnosuke