term_windows.go

     1  // Copyright 2019 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package term
     6  
     7  import (
     8  	"os"
     9  
    10  	"golang.org/x/sys/windows"
    11  )
    12  
    13  type state struct {
    14  	mode uint32
    15  }
    16  
    17  func isTerminal(fd int) bool {
    18  	var st uint32
    19  	err := windows.GetConsoleMode(windows.Handle(fd), &st)
    20  	return err == nil
    21  }
    22  
    23  // This is intended to be used on a console input handle.
    24  // See https://learn.microsoft.com/en-us/windows/console/setconsolemode
    25  func makeRaw(fd int) (*State, error) {
    26  	var st uint32
    27  	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
    28  		return nil, err
    29  	}
    30  	raw := st &^ (windows.ENABLE_ECHO_INPUT | windows.ENABLE_PROCESSED_INPUT | windows.ENABLE_LINE_INPUT)
    31  	raw |= windows.ENABLE_VIRTUAL_TERMINAL_INPUT
    32  	if err := windows.SetConsoleMode(windows.Handle(fd), raw); err != nil {
    33  		return nil, err
    34  	}
    35  	return &State{state{st}}, nil
    36  }
    37  
    38  func getState(fd int) (*State, error) {
    39  	var st uint32
    40  	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
    41  		return nil, err
    42  	}
    43  	return &State{state{st}}, nil
    44  }
    45  
    46  func restore(fd int, state *State) error {
    47  	return windows.SetConsoleMode(windows.Handle(fd), state.mode)
    48  }
    49  
    50  func getSize(fd int) (width, height int, err error) {
    51  	var info windows.ConsoleScreenBufferInfo
    52  	if err := windows.GetConsoleScreenBufferInfo(windows.Handle(fd), &info); err != nil {
    53  		return 0, 0, err
    54  	}
    55  	return int(info.Window.Right - info.Window.Left + 1), int(info.Window.Bottom - info.Window.Top + 1), nil
    56  }
    57  
    58  func readPassword(fd int) ([]byte, error) {
    59  	var st uint32
    60  	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
    61  		return nil, err
    62  	}
    63  	old := st
    64  
    65  	st &^= (windows.ENABLE_ECHO_INPUT | windows.ENABLE_LINE_INPUT)
    66  	st |= (windows.ENABLE_PROCESSED_OUTPUT | windows.ENABLE_PROCESSED_INPUT)
    67  	if err := windows.SetConsoleMode(windows.Handle(fd), st); err != nil {
    68  		return nil, err
    69  	}
    70  
    71  	defer windows.SetConsoleMode(windows.Handle(fd), old)
    72  
    73  	var h windows.Handle
    74  	p, _ := windows.GetCurrentProcess()
    75  	if err := windows.DuplicateHandle(p, windows.Handle(fd), p, &h, 0, false, windows.DUPLICATE_SAME_ACCESS); err != nil {
    76  		return nil, err
    77  	}
    78  
    79  	f := os.NewFile(uintptr(h), "stdin")
    80  	defer f.Close()
    81  	return readPasswordLine(f)
    82  }
    83
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