logging.go
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logging.go
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	package log

	import (
	"fmt"
	"os"

	cli "gopkg.in/urfave/cli.v1"
	)

	// Info logs general diagnostic messages, shown only when the -v or --verbose
	// flag is provided.
	func Info(c *cli.Context, s string, p ...interface{}) {
	if c.Bool("v") \|\| c.Bool("verbose") {
	fmt.Fprintf(os.Stderr, s+"\n", p...)
	}
	}

	// InfolnQuit logs the message to stderr and exits normally (without an error).
	func InfolnQuit(s string, p ...interface{}) {
	fmt.Fprintf(os.Stderr, s+"\n", p...)
	os.Exit(0)
	}

	// Errorln logs the message to stderr
	func Errorln(s string, p ...interface{}) {
	fmt.Fprintf(os.Stderr, s+"\n", p...)
	}

	// ErrorlnQuit logs the message to stderr and exits with an error code.
	func ErrorlnQuit(s string, p ...interface{}) {
	fmt.Fprintf(os.Stderr, s+"\n", p...)
	os.Exit(1)
	}