1//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || aix || zos
 2// +build darwin dragonfly freebsd linux netbsd openbsd solaris aix zos
 3
 4package tea
 5
 6import (
 7	"fmt"
 8	"os"
 9	"os/signal"
10	"syscall"
11
12	"github.com/charmbracelet/x/term"
13)
14
15func (p *Program) initInput() (err error) {
16	// Check if input is a terminal
17	if f, ok := p.input.(term.File); ok && term.IsTerminal(f.Fd()) {
18		p.ttyInput = f
19		p.previousTtyInputState, err = term.MakeRaw(p.ttyInput.Fd())
20		if err != nil {
21			return fmt.Errorf("error entering raw mode: %w", err)
22		}
23
24		// OPTIM: We can use hard tabs and backspaces to optimize cursor
25		// movements. This is based on termios settings support and whether
26		// they exist and enabled.
27		p.checkOptimizedMovements(p.previousTtyInputState)
28	}
29
30	if f, ok := p.output.(term.File); ok && term.IsTerminal(f.Fd()) {
31		p.ttyOutput = f
32	}
33
34	return nil
35}
36
37func openInputTTY() (*os.File, error) {
38	f, err := os.Open("/dev/tty")
39	if err != nil {
40		return nil, fmt.Errorf("could not open a new TTY: %w", err)
41	}
42	return f, nil
43}
44
45const suspendSupported = true
46
47// Send SIGTSTP to the entire process group.
48func suspendProcess() {
49	c := make(chan os.Signal, 1)
50	signal.Notify(c, syscall.SIGCONT)
51	_ = syscall.Kill(0, syscall.SIGTSTP)
52	// blocks until a CONT happens...
53	<-c
54}