A program that observes input and reacts when it finds a specific value.

README.md

This is a simple program that watches stdin and echos to stdout. When it finds input like bleep it echos preemptive bloop.

go build
cat input.txt | ./bleep

Sample output:

➜  bleep  cat input.txt | ./bleep
testing
one
two
three
preemptive bloop
bleep
bloop
done!

bleep.go

package main

import (
       "bufio"
       "fmt"
       "os"
)

func main() {
     reader := bufio.NewReader(os.Stdin)

     for {
         line, err := reader.ReadString('\n')

         if err != nil {
            break
         }

         if line == "bleep\n" {
            fmt.Println("preemptive bloop");
         }
         fmt.Print(line);
     }
}

input.txt

testing
one
two
three
bleep
bloop
done!