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Try to avoid panicking in PosixParser if there's no /dev/tty #185

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Try to avoid panicking in PosixParser if there's no /dev/tty #185

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12 changes: 10 additions & 2 deletions input_posix.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
package prompt

import (
"os"
"syscall"

"github.com/c-bata/go-prompt/internal/term"
Expand Down Expand Up @@ -54,7 +55,12 @@ func (t *PosixParser) Read() ([]byte, error) {
func (t *PosixParser) GetWinSize() *WinSize {
ws, err := unix.IoctlGetWinsize(t.fd, unix.TIOCGWINSZ)
if err != nil {
panic(err)
// If this errors, we simply return the default window size as
// it's our best guess.
return &WinSize{
Row: 25,
Col: 80,
}
}
return &WinSize{
Row: ws.Row,
Expand All @@ -67,7 +73,9 @@ var _ ConsoleParser = &PosixParser{}
// NewStandardInputParser returns ConsoleParser object to read from stdin.
func NewStandardInputParser() *PosixParser {
in, err := syscall.Open("/dev/tty", syscall.O_RDONLY, 0)
if err != nil {
if os.IsNotExist(err) {
in = syscall.Stdin
} else if err != nil {
panic(err)
}

Expand Down