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1ada95e04a
- Convert project to Javascript/Typescript - Allow custom headers to be passed in (optional) - Allow body to be optional
147 lines
3.4 KiB
Markdown
147 lines
3.4 KiB
Markdown
Flexible ascii progress bar.
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## Installation
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```bash
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$ npm install progress
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```
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## Usage
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First we create a `ProgressBar`, giving it a format string
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as well as the `total`, telling the progress bar when it will
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be considered complete. After that all we need to do is `tick()` appropriately.
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```javascript
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var ProgressBar = require('progress');
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var bar = new ProgressBar(':bar', { total: 10 });
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var timer = setInterval(function () {
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bar.tick();
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if (bar.complete) {
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console.log('\ncomplete\n');
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clearInterval(timer);
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}
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}, 100);
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```
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### Options
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These are keys in the options object you can pass to the progress bar along with
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`total` as seen in the example above.
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- `curr` current completed index
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- `total` total number of ticks to complete
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- `width` the displayed width of the progress bar defaulting to total
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- `stream` the output stream defaulting to stderr
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- `head` head character defaulting to complete character
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- `complete` completion character defaulting to "="
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- `incomplete` incomplete character defaulting to "-"
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- `renderThrottle` minimum time between updates in milliseconds defaulting to 16
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- `clear` option to clear the bar on completion defaulting to false
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- `callback` optional function to call when the progress bar completes
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### Tokens
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These are tokens you can use in the format of your progress bar.
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- `:bar` the progress bar itself
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- `:current` current tick number
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- `:total` total ticks
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- `:elapsed` time elapsed in seconds
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- `:percent` completion percentage
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- `:eta` estimated completion time in seconds
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- `:rate` rate of ticks per second
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### Custom Tokens
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You can define custom tokens by adding a `{'name': value}` object parameter to your method (`tick()`, `update()`, etc.) calls.
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```javascript
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var bar = new ProgressBar(':current: :token1 :token2', { total: 3 })
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bar.tick({
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'token1': "Hello",
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'token2': "World!\n"
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})
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bar.tick(2, {
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'token1': "Goodbye",
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'token2': "World!"
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})
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```
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The above example would result in the output below.
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```
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1: Hello World!
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3: Goodbye World!
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```
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## Examples
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### Download
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In our download example each tick has a variable influence, so we pass the chunk
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length which adjusts the progress bar appropriately relative to the total
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length.
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```javascript
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var ProgressBar = require('progress');
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var https = require('https');
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var req = https.request({
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host: 'download.github.com',
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port: 443,
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path: '/visionmedia-node-jscoverage-0d4608a.zip'
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});
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req.on('response', function(res){
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var len = parseInt(res.headers['content-length'], 10);
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console.log();
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var bar = new ProgressBar(' downloading [:bar] :rate/bps :percent :etas', {
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complete: '=',
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incomplete: ' ',
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width: 20,
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total: len
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});
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res.on('data', function (chunk) {
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bar.tick(chunk.length);
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});
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res.on('end', function () {
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console.log('\n');
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});
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});
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req.end();
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```
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The above example result in a progress bar like the one below.
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```
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downloading [===== ] 39/bps 29% 3.7s
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```
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### Interrupt
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To display a message during progress bar execution, use `interrupt()`
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```javascript
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var ProgressBar = require('progress');
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var bar = new ProgressBar(':bar :current/:total', { total: 10 });
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var timer = setInterval(function () {
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bar.tick();
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if (bar.complete) {
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clearInterval(timer);
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} else if (bar.curr === 5) {
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bar.interrupt('this message appears above the progress bar\ncurrent progress is ' + bar.curr + '/' + bar.total);
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}
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}, 1000);
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```
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You can see more examples in the `examples` folder.
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## License
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MIT
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