Powerful Command-Line Applications in Go

Capturing Input from STDIN

Good command-line tools interact well with your users, but they also work well with other tools. A common way command-line programs interact with one another is by accepting input from the standard input (STDIN) stream. Let’s add one last feature to the program: the ability to add new tasks via STDIN, allowing your users to pipe new tasks from other command-line tools.

To start this update, add three new libraries to your main.go import list: bufio, io, and strings:

interacting/todo.v4/cmd/todo/main.go

import (
  "bufio"
  "flag"
  "fmt"

  "io"
  "os"

  "strings"

  "pragprog.com/rggo/interacting/todo"
)

You’ll use the bufio package to read data from the STDIN input stream, the io package to use ...