package cli

import (
	"fmt"
	"io"
)

func Usage(w io.Writer) {
	fmt.Fprint(w, `slacksend - send a message to Slack (Incoming Webhook)

Usage:
  slacksend [options] <message...>
  echo "message" | slacksend [options]

Options:
  -V, --version             show version
  -h, --help     show this help

Environment:
  SLACK_WEBHOOK_URL   Slack Incoming Webhook URL

Examples:
  export SLACK_WEBHOOK_URL="https://hooks.slack.com/services/XXX/YYY/ZZZ"
  slacksend "hello slack"
  echo "hello from stdin" | slacksend
`)
}