verless/out/out.go at fix-tags · dominikbraun/verless

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// Package out provides functions for printing output to the user.

// Instead of using the standard library, this package should be used

// for printing user information and logging in general. Note that the

// out package isn't optimized for hot paths at the moment.

// This package is inspired by https://github.com/kubernetes/minikube.

package out

import (

"fmt"

"io"

"os"

"github.com/verless/verless/out/style"

)

var (

outFile io.Writer = os.Stdout

errFile io.Writer = os.Stderr

)

// T prints a prefixed, formatted text to the out file as a new line.

func T(prefix style.Emoji, format string, a ...interface{}) {

printf(outFile, prefix, format, a...)

}

// Err prints a prefixed, formatted text to the error file as a new line.

func Err(prefix style.Emoji, format string, a ...interface{}) {

printf(errFile, prefix, format, a...)

}

func printf(w io.Writer, prefix style.Emoji, format string, a ...interface{}) {

formatted := fmt.Sprintf(format, a...)

var output string

if prefix == style.None {

output = fmt.Sprintf("%s\n", formatted)

} else {

output = fmt.Sprintf("%s %s\n", prefix, formatted)

}

_, _ = w.Write([]byte(output))

}