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# progressbar
[](https://github.com/schollz/progressbar/actions/workflows/ci.yml)
[](https://goreportcard.com/report/github.com/schollz/progressbar)
[](https://gocover.io/github.com/schollz/progressbar)
[](https://godoc.org/github.com/schollz/progressbar/v3)
A very simple thread-safe progress bar which should work on every OS without problems. I needed a progressbar for [croc](https://github.com/schollz/croc) and everything I tried had problems, so I made another one. In order to be OS agnostic I do not plan to support [multi-line outputs](https://github.com/schollz/progressbar/issues/6).
## Install
```
go get -u github.com/schollz/progressbar/v3
```
## Usage
### Basic usage
```golang
bar := progressbar.Default(100)
for i := 0; i < 100; i++ {
bar.Add(1)
time.Sleep(40 * time.Millisecond)
}
```
which looks like:
### I/O operations
The `progressbar` implements an `io.Writer` so it can automatically detect the number of bytes written to a stream, so you can use it as a progressbar for an `io.Reader`.
```golang
req, _ := http.NewRequest("GET", "https://dl.google.com/go/go1.14.2.src.tar.gz", nil)
resp, _ := http.DefaultClient.Do(req)
defer resp.Body.Close()
f, _ := os.OpenFile("go1.14.2.src.tar.gz", os.O_CREATE|os.O_WRONLY, 0644)
defer f.Close()
bar := progressbar.DefaultBytes(
resp.ContentLength,
"downloading",
)
io.Copy(io.MultiWriter(f, bar), resp.Body)
```
which looks like:
### Progress bar with unknown length
A progressbar with unknown length is a spinner. Any bar with -1 length will automatically convert it to a spinner with a customizable spinner type. For example, the above code can be run and set the `resp.ContentLength` to `-1`.
which looks like:
### Customization
There is a lot of customization that you can do - change the writer, the color, the width, description, theme, etc. See [all the options](https://pkg.go.dev/github.com/schollz/progressbar/v3?tab=doc#Option).
```golang
bar := progressbar.NewOptions(1000,
progressbar.OptionSetWriter(ansi.NewAnsiStdout()), //you should install "github.com/k0kubun/go-ansi"
progressbar.OptionEnableColorCodes(true),
progressbar.OptionShowBytes(true),
progressbar.OptionSetWidth(15),
progressbar.OptionSetDescription("[cyan][1/3][reset] Writing moshable file..."),
progressbar.OptionSetTheme(progressbar.Theme{
Saucer: "[green]=[reset]",
SaucerHead: "[green]>[reset]",
SaucerPadding: " ",
BarStart: "[",
BarEnd: "]",
}))
for i := 0; i < 1000; i++ {
bar.Add(1)
time.Sleep(5 * time.Millisecond)
}
```
which looks like:
## Contributing
Pull requests are welcome. Feel free to...
- Revise documentation
- Add new features
- Fix bugs
- Suggest improvements
## Thanks
Thanks [@Dynom](https://github.com/dynom) for massive improvements in version 2.0!
Thanks [@CrushedPixel](https://github.com/CrushedPixel) for adding descriptions and color code support!
Thanks [@MrMe42](https://github.com/MrMe42) for adding some minor features!
Thanks [@tehstun](https://github.com/tehstun) for some great PRs!
Thanks [@Benzammour](https://github.com/Benzammour) and [@haseth](https://github.com/haseth) for helping create v3!
Thanks [@briandowns](https://github.com/briandowns) for compiling the list of spinners.
## License
MIT
|
