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package main
import (
"bytes"
"errors"
"flag"
"fmt"
"os"
"os/exec"
"strconv"
"strings"
"time"
"golang.org/x/term"
)
var n = flag.Duration("n", 2*time.Minute, "polling interval")
func run() error {
cols, _, err := term.GetSize(int(os.Stdout.Fd()))
if err != nil {
return err
}
args := flag.Args()
if len(args) < 2 {
return errors.New("usage error")
}
maxStr := args[0]
maxVal, err := strconv.Atoi(maxStr)
if err != nil {
return fmt.Errorf("max: %s", err)
}
cmd := args[1:]
type measurement struct {
t time.Time
i int
}
var measurements []measurement
for i := 0; ; i++ {
outputBytes, err := exec.Command(cmd[0], cmd[1:]...).Output()
if err != nil {
fmt.Println(err)
continue
}
output, err := strconv.Atoi(string(bytes.TrimSuffix(outputBytes, []byte("\n"))))
if err != nil {
fmt.Println(err)
continue
}
p := output * cols / maxVal
if i > 0 {
fmt.Print("\033[2F\033[J")
}
fmt.Printf("%s>\n", strings.Repeat("=", max(p-1, 0)))
measurements = append(measurements, measurement{time.Now(), output})
if len(measurements) > 20 {
measurements = measurements[1:]
}
deltaT := measurements[len(measurements)-1].t.Sub(measurements[0].t)
delta := measurements[len(measurements)-1].i - measurements[0].i
if delta == 0 {
fmt.Println()
} else {
fmt.Printf("ETA: %s\n", time.Duration(float64(maxVal-output)/float64(delta)*float64(deltaT)).Round(time.Second))
}
time.Sleep(*n)
}
}
func main() {
flag.Parse()
if err := run(); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
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