123 lines
3.3 KiB
Markdown
123 lines
3.3 KiB
Markdown
# progressbar
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[](https://travis-ci.org/schollz/progressbar)
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[](https://goreportcard.com/report/github.com/schollz/progressbar)
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[](https://gocover.io/github.com/schollz/progressbar)
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[](https://godoc.org/github.com/schollz/progressbar)
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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.
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## Install
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```
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go get -u github.com/schollz/progressbar/v2
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```
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## Usage
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### Basic usage
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```golang
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bar := progressbar.New(100)
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for i := 0; i < 100; i++ {
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bar.Add(1)
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time.Sleep(10 * time.Millisecond)
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}
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```
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which looks like:
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```bash
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100% |████████████████████████████████████████| [1s:0s]
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```
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The times at the end show the elapsed time and the remaining time, respectively.
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### Long running processes
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For long running processes, you might want to render from a 0% state.
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```golang
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// Renders the bar right on construction
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bar := progressbar.NewOptions(100, progressbar.OptionSetRenderBlankState(true))
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```
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Alternatively, when you want to delay rendering, but still want to render a 0% state
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```golang
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bar := progressbar.NewOptions(100)
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// Render the current state, which is 0% in this case
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bar.RenderBlank()
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// Emulate work
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for i := 0; i < 10; i++ {
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time.Sleep(10 * time.Minute)
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bar.Add(10)
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}
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```
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### Use a custom writer
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The default writer is standard output (os.Stdout), but you can set it to whatever satisfies io.Writer.
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```golang
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bar := NewOptions(
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10,
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OptionSetTheme(Theme{Saucer: "#", SaucerPadding: "-", BarStart: ">", BarEnd: "<"}),
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OptionSetWidth(10),
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OptionSetWriter(&buf),
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)
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bar.Add(5)
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result := strings.TrimSpace(buf.String())
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// Result equals:
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// 50% >#####-----< [0s:0s]
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```
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### Progress for I/O operations
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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`.
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```golang
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urlToGet := "https://github.com/schollz/croc/releases/download/v4.1.4/croc_v4.1.4_Windows-64bit_GUI.zip"
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req, _ := http.NewRequest("GET", urlToGet, nil)
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resp, _ := http.DefaultClient.Do(req)
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defer resp.Body.Close()
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var out io.Writer
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f, _ := os.OpenFile("croc_v4.1.4_Windows-64bit_GUI.zip", os.O_CREATE|os.O_WRONLY, 0644)
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out = f
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defer f.Close()
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bar := progressbar.NewOptions(
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int(resp.ContentLength),
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progressbar.OptionSetBytes(int(resp.ContentLength)),
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)
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out = io.MultiWriter(out, bar)
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io.Copy(out, resp.Body)
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```
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See the tests for another example.
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## Contributing
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Pull requests are welcome. Feel free to...
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- Revise documentation
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- Add new features
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- Fix bugs
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- Suggest improvements
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## Thanks
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Thanks [@Dynom](https://github.com/dynom) for massive improvements in version 2.0!
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Thanks [@CrushedPixel](https://github.com/CrushedPixel) for adding descriptions and color code support!
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## License
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MIT
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