63 lines
1.8 KiB
Go
63 lines
1.8 KiB
Go
package readline
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import (
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"syscall"
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"unsafe"
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)
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const (
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enableLineInput = 2
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enableWindowInput = 8
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enableMouseInput = 16
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enableInsertMode = 32
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enableQuickEditMode = 64
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enableExtendedFlags = 128
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enableProcessedOutput = 1
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enableWrapAtEolOutput = 2
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enableAutoPosition = 256 // Cursor position is not affected by writing data to the console.
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enableEchoInput = 4 // Characters are written to the console as they're read.
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enableProcessedInput = 1 // Enables input processing (like recognizing Ctrl+C).
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)
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var kernel32 = syscall.NewLazyDLL("kernel32.dll")
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var (
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procGetConsoleMode = kernel32.NewProc("GetConsoleMode")
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procSetConsoleMode = kernel32.NewProc("SetConsoleMode")
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)
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type State struct {
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mode uint32
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}
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// IsTerminal checks if the given file descriptor is associated with a terminal
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func IsTerminal(fd int) bool {
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var st uint32
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r, _, e := syscall.SyscallN(procGetConsoleMode.Addr(), uintptr(fd), uintptr(unsafe.Pointer(&st)), 0)
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// if the call succeeds and doesn't produce an error, it's a terminal
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return r != 0 && e == 0
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}
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func SetRawMode(fd int) (*State, error) {
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var st uint32
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// retrieve the current mode of the terminal
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_, _, e := syscall.SyscallN(procGetConsoleMode.Addr(), uintptr(fd), uintptr(unsafe.Pointer(&st)), 0)
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if e != 0 {
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return nil, error(e)
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}
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// modify the mode to set it to raw
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raw := st &^ (enableEchoInput | enableProcessedInput | enableLineInput | enableProcessedOutput)
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// apply the new mode to the terminal
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_, _, e = syscall.SyscallN(procSetConsoleMode.Addr(), uintptr(fd), uintptr(raw), 0)
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if e != 0 {
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return nil, error(e)
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}
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// return the original state so that it can be restored later
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return &State{st}, nil
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}
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func UnsetRawMode(fd int, state any) error {
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s := state.(*State)
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_, _, err := syscall.SyscallN(procSetConsoleMode.Addr(), uintptr(fd), uintptr(s.mode), 0)
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return err
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}
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