bufio: Reading from stdin breaks arrow keys

[mybearworld]

Go version

go version go1.23.0 linux/amd64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/home/mybearworld/.cache/go-build'
GOENV='/home/mybearworld/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/home/mybearworld/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/home/mybearworld/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/home/mybearworld/.go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/home/mybearworld/.go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.23.0'
GODEBUG=''
GOTELEMETRY='local'
GOTELEMETRYDIR='/home/mybearworld/.config/go/telemetry'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/home/mybearworld/playground/stdinbufio/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3760656799=/tmp/go-build -gno-record-gcc-switches'

What did you do?

main.go:

package main

import (
        "bufio"
        "fmt"
        "os"
)

func main() {
        reader := bufio.NewReader(os.Stdin)
        s, err := reader.ReadString('\n')
        fmt.Println(s, err)
}

Keystrokes: Hello, world!← and mars

What did you see happen?

Hello, world!^[[D and mars
Hello, world and mars
 <nil>

The arrow key is displayed as its code (^[[D) and deletes a character.

What did you expect to see?

Hello, world and mars!
Hello, world and mars!
 <nil>

The arrow key acts as it normally does (moving a character back and displaying it as such).

[gabyhelp]

Related Issues and Documentation

• why can't get input line from stdin when this line end with EOF #33590 (closed)

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}

[seankhliao]

stdin is a raw input stream, the implementation of line editing through arrow keys or other control characters is left to applications/libraries.

Closing as working as intended.

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