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|
package main
import (
// we want *real* random
"crypto/rand"
"fmt"
"os"
"unicode"
)
func main() {
jobList := make(chan [2]chan rune, 4096)
// spin up an appropriate amount of workers for this task
go worker(jobList)
go worker(jobList)
go worker(jobList)
go worker(jobList)
go worker(jobList)
go worker(jobList)
go worker(jobList)
go worker(jobList)
go worker(jobList)
go worker(jobList)
go worker(jobList)
go worker(jobList)
go worker(jobList)
go worker(jobList)
go worker(jobList)
go worker(jobList)
outchans := make(chan chan rune, 4096)
done := make(chan struct{}, 1)
go func(o chan chan rune) {
for r := range o {
fmt.Printf("%c", <-r)
}
done <- struct{}{}
}(outchans)
for _, str := range os.Args[1:] {
for _, c := range str {
in := make(chan rune, 1)
out := make(chan rune, 1)
outchans <- out
jobList <- [2]chan rune{in, out}
in <- c
close(in)
}
out := make(chan rune, 1)
outchans <- out
out <- ' '
close(out)
}
close(outchans)
<-done
}
func worker(jobList chan [2]chan rune) {
b := make([]byte, 1)
for job := range jobList {
c := <-job[0]
_, err := rand.Read(b)
if err != nil {
job[1] <- c
close(job[1])
continue
}
if b[0]%2 == 0 {
// switch case
if unicode.ToUpper(c) == c {
job[1] <- unicode.ToLower(c)
} else {
job[1] <- unicode.ToUpper(c)
}
close(job[1])
continue
}
job[1] <- c
close(job[1])
}
}
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