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package main
import (
"bufio"
"fmt"
"io"
"math"
"os"
)
func rgb(i int) (int, int, int) {
var f = 0.1
return int(math.Sin(f*float64(i)+0)*127 + 128),
int(math.Sin(f*float64(i)+2*math.Pi/3)*127 + 128),
int(math.Sin(f*float64(i)+4*math.Pi/3)*127 + 128)
}
func main() {
info, _ := os.Stdin.Stat()
if info.Mode()&os.ModeCharDevice != 0 {
fmt.Println("The command is intended to work with pipes.")
fmt.Println("Usage: command | gorainbow")
}
reader := bufio.NewReader(os.Stdin)
j := 0
for {
input, _, err := reader.ReadRune()
if err != nil && err == io.EOF {
break
}
r, g, b := rgb(j)
fmt.Printf("\033[38;2;%d;%d;%dm%c\033[0m", r, g, b, input)
j++
}
}
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