A very simple thread-safe progress bar which should work on every OS without problems. I needed a progressbar for croc and everything I tried had problems, so I made another one.
go get -u github.com/schollz/progressbar/v2
bar := progressbar.New(100)
for i := 0; i < 100; i++ {
bar.Add(1)
time.Sleep(10 * time.Millisecond)
}which looks like:
100% |████████████████████████████████████████| [1s:0s]The times at the end show the elapsed time and the remaining time, respectively.
For long running processes, you might want to render from a 0% state.
// Renders the bar right on construction
bar := progressbar.NewOptions(100, progressbar.OptionSetRenderBlankState(true))Alternatively, when you want to delay rendering, but still want to render a 0% state
bar := progressbar.NewOptions(100)
// Render the current state, which is 0% in this case
bar.RenderBlank()
// Emulate work
for i := 0; i < 10; i++ {
time.Sleep(10 * time.Minute)
bar.Add(10)
}The default writer is standard output (os.Stdout), but you can set it to whatever satisfies io.Writer.
bar := NewOptions(
10,
OptionSetTheme(Theme{Saucer: "#", SaucerPadding: "-", BarStart: ">", BarEnd: "<"}),
OptionSetWidth(10),
OptionSetWriter(&buf),
)
bar.Add(5)
result := strings.TrimSpace(buf.String())
// Result equals:
// 50% >#####-----< [0s:0s]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.
urlToGet := "https://github.com/schollz/croc/releases/download/v4.1.4/croc_v4.1.4_Windows-64bit_GUI.zip"
req, _ := http.NewRequest("GET", urlToGet, nil)
resp, _ := http.DefaultClient.Do(req)
defer resp.Body.Close()
var out io.Writer
f, _ := os.OpenFile("croc_v4.1.4_Windows-64bit_GUI.zip", os.O_CREATE|os.O_WRONLY, 0644)
out = f
defer f.Close()
bar := progressbar.NewOptions(
int(resp.ContentLength),
progressbar.OptionSetBytes(int(resp.ContentLength)),
)
out = io.MultiWriter(out, bar)
io.Copy(out, resp.Body)See the tests for another example.
Pull requests are welcome. Feel free to...
- Revise documentation
- Add new features
- Fix bugs
- Suggest improvements
Thanks @Dynom for massive improvements in version 2.0!
Thanks @CrushedPixel for adding descriptions and color code support!
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