bufio.NewScanner(os.Stdin) seems to corrupt the output

[Maverobot]

Operating system: Ubuntu 16.04
Terminal: xterm
Go version: 1.12
Description: I am trying to create a cli program which feeds the piped infomation into a survey.MultiSelect.
Issue: the option list seems to be refreshed with a low frequency and no option could be selected. I had to press Ctrl+c to stop the program.
Sample code:

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strings"

	"gopkg.in/AlecAivazis/survey.v1"
)

func createQuestion(name string, message string, options []string) []*survey.Question {
	return []*survey.Question{
		{
			Name: name,
			Prompt: &survey.MultiSelect{
				Message: message,
				Options: options,
			},
		},
	}
}

func main() {
	// Get data options from pipe
	options := []string{
		"option 1",
		"option 2",
	}
	fi, err := os.Stdin.Stat()
	if err != nil {
		panic(err)
	}

	if fi.Mode()&os.ModeNamedPipe == 0 {
		fmt.Println("no pipe :(")
		return
	}

	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		options = append(options, scanner.Text())
		fmt.Println(scanner.Text())
	}

	if err := scanner.Err(); err != nil {
		log.Println(err)
	}

	// ask the question
	answers := []string{}
	question := createQuestion("letter", "Select topics...", options)
	err = survey.Ask(question, &answers)

	if err != nil {
		fmt.Println(err.Error())
		return
	}
	// print the answers
	fmt.Printf("you chose: %s\n", strings.Join(answers, ", "))
}

Note: I just started to learn Golang a week ago. This issue might be caused by my own stupidity.

[jobnte]

Same here, it happens when I do go build then open the .exe in windows environment

[felipesere]

Interacting in any way with Stdin seems to break the core loop.
I also see that survey no longer reacts to keyboard imput other than Ctrl-C when the input is corrupted.

[mislav]

Duplicate of #328

Survey only works if stdin is connected to a terminal. Therefore, right now you cannot pipe something into your program if it's going to display prompts with Survey.