zenizh / go-capturer

Capture stdout and/or stderr in Go.

go-capturer

Capture os.Stdout and/or os.Stderr in Go. This package is useful for writing tests which print some outputs using fmt package.

Usage

This package provides CaptureStdout(), CaptureStderr() and CaptureOutput() functions to capture outputs.

package main

import (
	"fmt"
	"os"

	"github.com/kami-zh/go-capturer"
)

func ExampleCaptureStdout() {
	out := capturer.CaptureStdout(func() {
		fmt.Fprint(os.Stdout, "foo")
	})

	fmt.Println(out)
	// Output: foo
}

func ExampleCaptureStderr() {
	out := capturer.CaptureStderr(func() {
		fmt.Fprint(os.Stderr, "bar")
	})

	fmt.Println(out)
	// Output: bar
}

func ExampleCaptureOutput() {
	out := capturer.CaptureOutput(func() {
		fmt.Fprint(os.Stdout, "foo")
		fmt.Fprint(os.Stderr, "bar")
	})

	fmt.Println(out)
	// Output: foobar
}

Installation

$ go get github.com/kami-zh/go-capturer

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/kami-zh/go-capturer.

License

The package is available as open source under the terms of the MIT License.