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67 lines
1.5 KiB
Go
67 lines
1.5 KiB
Go
//go:build unix
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package term
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import (
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"fmt"
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"os"
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"golang.org/x/sys/unix"
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"src.elv.sh/pkg/errutil"
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"src.elv.sh/pkg/sys/eunix"
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)
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func setup(in, out *os.File) (func() error, error) {
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// On Unix, use input file for changing termios. All fds pointing to the
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// same terminal are equivalent.
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fd := int(in.Fd())
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term, err := eunix.TermiosForFd(fd)
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if err != nil {
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return nil, fmt.Errorf("can't get terminal attribute: %s", err)
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}
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savedTermios := term.Copy()
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term.SetICanon(false)
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term.SetIExten(false)
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term.SetEcho(false)
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term.SetVMin(1)
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term.SetVTime(0)
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// Enforcing crnl translation on readline. Assuming user won't set
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// inlcr or -onlcr, otherwise we have to hardcode all of them here.
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term.SetICRNL(true)
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err = term.ApplyToFd(fd)
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if err != nil {
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return nil, fmt.Errorf("can't set up terminal attribute: %s", err)
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}
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var errSetupVT error
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err = setupVT(out)
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if err != nil {
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errSetupVT = fmt.Errorf("can't setup VT: %s", err)
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}
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restore := func() error {
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return errutil.Multi(savedTermios.ApplyToFd(fd), restoreVT(out))
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}
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return restore, errSetupVT
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}
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func setupForEval(in, out *os.File) func() {
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// There is nothing to set up on Unix, but we try to sanitize the terminal
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// when evaluation finishes.
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return func() { sanitize(in, out) }
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}
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func sanitize(in, out *os.File) {
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// Some programs use non-blocking IO but do not correctly clear the
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// non-blocking flags after exiting, so we always clear the flag. See #822
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// for an example.
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unix.SetNonblock(int(in.Fd()), false)
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unix.SetNonblock(int(out.Fd()), false)
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}
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