blob: 12992cfe7993f9ecef8c97e8abb76b8c351be1cd (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Paul Buetow
package repl
import (
"fmt"
"os"
"github.com/mattn/go-isatty"
)
// TTYChecker provides TTY detection functionality.
// It uses the go-isatty package to determine if stdin is a terminal.
type TTYChecker struct{}
// IsTTY returns true if stdin is a terminal.
// This is useful for determining whether to run in interactive REPL mode.
//
// Returns true if stdin is a TTY, false otherwise
func (c *TTYChecker) IsTTY() bool {
return isatty.IsTerminal(os.Stdin.Fd())
}
// EnsureTTY checks if stdin is a TTY and returns an error if not.
// This is used to prevent running the REPL in non-interactive contexts
// (e.g., when stdin is piped from a file or another command).
//
// Returns nil if stdin is a TTY, or an error describing the issue otherwise
func (c *TTYChecker) EnsureTTY() error {
if !c.IsTTY() {
fmt.Fprintln(os.Stderr, "REPL mode requires a TTY. Use 'gt <calculation>' for non-interactive mode.")
return fmt.Errorf("stdin is not a TTY")
}
return nil
}
|
