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// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
// See page 308.
//!+
// Echo prints its command-line arguments.
package main
import (
"flag"
"fmt"
"io"
"os"
"strings"
)
var (
n = flag.Bool("n", false, "omit trailing newline")
s = flag.String("s", " ", "separator")
)
var out io.Writer = os.Stdout // modified during testing
func main() {
flag.Parse()
if err := echo(!*n, *s, flag.Args()); err != nil {
fmt.Fprintf(os.Stderr, "echo: %v\n", err)
os.Exit(1)
}
}
func echo(newline bool, sep string, args []string) error {
fmt.Fprint(out, strings.Join(args, sep))
if newline {
fmt.Fprintln(out)
}
return nil
}
//!-
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