go_dobufio/main.go

package main

import (
	"bufio"
	"os"
	"strings"
)

// pipedInput looks for data queued up on stdin.
func pipedInput() bool {
	stat, _ := os.Stdin.Stat()
	if (stat.Mode() & os.ModeCharDevice) == 0 {
		return true
	}
	return false
}

func main() {
	// Process input and output with bufio
	sti := bufio.NewScanner(os.Stdin)
	sto := bufio.NewWriter(os.Stdout)
	ste := bufio.NewWriter(os.Stderr)

	// Check for existing data
	if !pipedInput() {
		// Prompt is there is none
		// fmt.Fprintln(os.Stderr, "Feed me words!")
		ste.WriteString("Feed me words!\n")
		ste.Flush()
	}
	for sti.Scan() {
		// Stop on an empty string
		if sti.Text() == "" {
			break
		}
		// Process the incoming strings
		titled := strings.Title(sti.Text())
		// fmt.Println(titled)
		sto.WriteString(titled + "\n")
		sto.Flush()
	}
}