output.go

// This file is part of arduino-cli.
//
// Copyright 2020 ARDUINO SA (http://www.arduino.cc/)
//
// This software is released under the GNU General Public License version 3,
// which covers the main part of arduino-cli.
// The terms of this license can be found at:
// https://www.gnu.org/licenses/gpl-3.0.en.html
//
// You can be released from the requirements of the above licenses by purchasing
// a commercial license. Buying such a license is mandatory if you want to
// modify or otherwise use the software for commercial activities involving the
// Arduino software without disclosing the source code of your own applications.
// To purchase a commercial license, send an email to license@arduino.cc.

package executils

import (
"bufio"
"fmt"
"os"
"os/exec"
)

// OutputListener is a callback interface to receive output messages from process
typeOutputListenerinterface {
Output(msgstring)
}

// AttachStdoutListener adds an OutputListener to the stdout of the process
funcAttachStdoutListener(cmd*exec.Cmd, listenerOutputListener) error {
stdout, err:=cmd.StdoutPipe()
iferr!=nil {
returnfmt.Errorf(tr("can't retrieve standard output stream: %s"), err)
 }

stdoutCopy:=bufio.NewScanner(stdout)
stdoutCopy.Split(bufio.ScanLines)
gofunc() {
forstdoutCopy.Scan() {
listener.Output(stdoutCopy.Text())
 }
 }()

returnnil
}

// AttachStderrListener adds an OutputListener to the stderr of the process
funcAttachStderrListener(cmd*exec.Cmd, listenerOutputListener) error {
stderr, err:=cmd.StderrPipe()
iferr!=nil {
returnfmt.Errorf(tr("can't retrieve standard error stream: %s"), err)
 }

stderrCopy:=bufio.NewScanner(stderr)
stderrCopy.Split(bufio.ScanLines)
gofunc() {
forstderrCopy.Scan() {
listener.Output(stderrCopy.Text())
 }
 }()

returnnil
}

// PrintToStdout is an OutputListener that outputs messages to standard output
varPrintToStdout=&printToStdout{}

typeprintToStdoutstruct{}

func (*printToStdout) Output(msgstring) {
fmt.Fprintln(os.Stdout, msg)
}

// PrintToStderr is an OutputListener that outputs messages to standard error
varPrintToStderr=&printToStderr{}

typeprintToStderrstruct{}

func (*printToStderr) Output(msgstring) {
fmt.Fprintln(os.Stderr, msg)
}