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// Package progress implements a simple command line progress bar.
//
// Example:
//
// import (
// time"
//
// "gitlab.com/rhogenson/progress-bar"
// )
//
// func main() {
// b := new(progress.Bar)
// for i := range 100 {
// b.Set(float64(i)/100)
// b.Print()
// time.Sleep(time.Second)
// }
// }
package progress
import (
"fmt"
"os"
"strings"
"time"
"gitlab.com/rhogenson/vecdeque"
"golang.org/x/term"
)
const measurements = 20
type measurement struct {
t time.Time
i float64
}
// Bar is a progess bar. The zero value is ready for use.
type Bar struct {
measurements vecdeque.DQ[measurement]
cols int
}
// Set sets the current value to val. val must be between 0 and 1, inclusive.
func (b *Bar) Set(val float64) {
if !(0 <= val && val <= 1) {
panic(fmt.Sprintf("progress.Bar.Set: value must be between 0 and 1 (got %f)", val))
}
if b.measurements.Len() == measurements {
b.measurements.PopFront()
}
b.measurements.PushBack(measurement{time.Now(), val})
}
// Print shows the progress bar on standard error.
func (b *Bar) Print() {
if b.measurements.Len() == 0 {
return
}
first := b.measurements.Get(0)
last := b.measurements.Get(b.measurements.Len() - 1)
deltaT := last.t.Sub(first.t)
delta := last.i - first.i
eta := time.Duration(-1)
if delta != 0 {
eta = time.Duration(float64(deltaT) * (1 - last.i) / delta)
}
p := int(last.i * float64(b.cols))
if b.cols == 0 {
var err error
if b.cols, _, err = term.GetSize(int(os.Stderr.Fd())); err != nil {
fmt.Fprintf(os.Stderr, "Warning: unable to determine terminal size: %s\n", err)
} else {
fmt.Fprintf(os.Stderr, "%s>\n", strings.Repeat("=", max(p-1, 0)))
}
} else {
fmt.Fprintf(os.Stderr, "\033[2F\033[J%s>\n", strings.Repeat("=", max(p-1, 0)))
}
if eta < 0 {
fmt.Fprintln(os.Stderr, "ETA: calculating...")
} else {
fmt.Fprintf(os.Stderr, "ETA: %s\n", eta.Round(time.Second))
}
}
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