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https://github.com/visionmedia/node-progress

Flexible ascii progress bar for nodejs
https://github.com/visionmedia/node-progress

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Flexible ascii progress bar for nodejs

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README 

        
Flexible ascii progress bar.



## Installation



```bash

$ npm install progress

```



## Usage



First we create a `ProgressBar`, giving it a format string

as well as the `total`, telling the progress bar when it will

be considered complete. After that all we need to do is `tick()` appropriately.



```javascript

var ProgressBar = require('progress');



var bar = new ProgressBar(':bar', { total: 10 });

var timer = setInterval(function () {

  bar.tick();

  if (bar.complete) {

    console.log('\ncomplete\n');

    clearInterval(timer);

  }

}, 100);

```



### Options



These are keys in the options object you can pass to the progress bar along with

`total` as seen in the example above.



- `curr` current completed index

- `total` total number of ticks to complete

- `width` the displayed width of the progress bar defaulting to total

- `stream` the output stream defaulting to stderr

- `head` head character defaulting to complete character

- `complete` completion character defaulting to "="

- `incomplete` incomplete character defaulting to "-"

- `renderThrottle` minimum time between updates in milliseconds defaulting to 16

- `clear` option to clear the bar on completion defaulting to false

- `callback` optional function to call when the progress bar completes



### Tokens



These are tokens you can use in the format of your progress bar.



- `:bar` the progress bar itself

- `:current` current tick number

- `:total` total ticks

- `:elapsed` time elapsed in seconds

- `:percent` completion percentage

- `:eta` estimated completion time in seconds

- `:rate` rate of ticks per second



### Custom Tokens



You can define custom tokens by adding a `{'name': value}` object parameter to your method (`tick()`, `update()`, etc.) calls.



```javascript

var bar = new ProgressBar(':current: :token1 :token2', { total: 3 })

bar.tick({

  'token1': "Hello",

  'token2': "World!\n"

})

bar.tick(2, {

  'token1': "Goodbye",

  'token2': "World!"

})

```

The above example would result in the output below.



```

1: Hello World!

3: Goodbye World!

```



## Examples



### Download



In our download example each tick has a variable influence, so we pass the chunk

length which adjusts the progress bar appropriately relative to the total

length.



```javascript

var ProgressBar = require('progress');

var https = require('https');



var req = https.request({

  host: 'download.github.com',

  port: 443,

  path: '/visionmedia-node-jscoverage-0d4608a.zip'

});



req.on('response', function(res){

  var len = parseInt(res.headers['content-length'], 10);



  console.log();

  var bar = new ProgressBar('  downloading [:bar] :rate/bps :percent :etas', {

    complete: '=',

    incomplete: ' ',

    width: 20,

    total: len

  });



  res.on('data', function (chunk) {

    bar.tick(chunk.length);

  });



  res.on('end', function () {

    console.log('\n');

  });

});



req.end();

```



The above example result in a progress bar like the one below.



```

downloading [=====             ] 39/bps 29% 3.7s

```



### Interrupt



To display a message during progress bar execution, use `interrupt()`

```javascript

var ProgressBar = require('progress');



var bar = new ProgressBar(':bar :current/:total', { total: 10 });

var timer = setInterval(function () {

  bar.tick();

  if (bar.complete) {

    clearInterval(timer);

  } else if (bar.curr === 5) {

      bar.interrupt('this message appears above the progress bar\ncurrent progress is ' + bar.curr + '/' + bar.total);

  }

}, 1000);

```



You can see more examples in the `examples` folder.



## License



MIT