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26
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1 package main
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2
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3 import (
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4 "flag"
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5 "fmt"
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6 "math/rand"
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7 "runtime"
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8 "time"
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9 )
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10
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11 func main() {
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12 sw := flag.Int( "w", 40, "screen width" )
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13 sl := flag.Int( "s", 100, "interval" )
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14 flag.Parse()
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15
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16 s := "0123456789abcdefghijkemnopqrstuvwxyzABCDEFGHIJKEMNOPQRSTUVWXYZ!@#$%&*|;:.,=+-/"
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17 n := len( s )
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18 r := 0
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19 for i := 1 ; ; i++ {
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20 r = rand.Intn( n )
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21 fmt.Printf( "%s ", random_color( s[r] ) )
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22 if i == *sw {
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23 for t := 0; t < *sl; t++ {
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24 time.Sleep( time.Millisecond )
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25 }
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26 fmt.Println()
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27 i = 0
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28 }
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29 }
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30 }
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31
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32 func random_color( s byte ) string {
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33 if runtime.GOOS == "windows" {
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34 return string( s )
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35 }
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36 // black, red, green yellow, blue, magenta, cyan, white
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37 c := [...]int{ 30, 31, 32, 33, 34, 35, 36, 37 }
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38 r := rand.Intn( len( c ) )
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39 return fmt.Sprintf( "\x1b[%dm%c\x1b[0m", c[r], s )
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40 }
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41
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