nt

A sensible note-taking program
git clone git://git.laack.co/nt.git
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term_windows.go (2185B)

      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 func makeRaw(fd int) (*State, error) {
     24 	var st uint32
     25 	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
     26 		return nil, err
     27 	}
     28 	raw := st &^ (windows.ENABLE_ECHO_INPUT | windows.ENABLE_PROCESSED_INPUT | windows.ENABLE_LINE_INPUT | windows.ENABLE_PROCESSED_OUTPUT)
     29 	raw |= windows.ENABLE_VIRTUAL_TERMINAL_INPUT
     30 	if err := windows.SetConsoleMode(windows.Handle(fd), raw); err != nil {
     31 		return nil, err
     32 	}
     33 	return &State{state{st}}, nil
     34 }
     35 
     36 func getState(fd int) (*State, error) {
     37 	var st uint32
     38 	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
     39 		return nil, err
     40 	}
     41 	return &State{state{st}}, nil
     42 }
     43 
     44 func restore(fd int, state *State) error {
     45 	return windows.SetConsoleMode(windows.Handle(fd), state.mode)
     46 }
     47 
     48 func getSize(fd int) (width, height int, err error) {
     49 	var info windows.ConsoleScreenBufferInfo
     50 	if err := windows.GetConsoleScreenBufferInfo(windows.Handle(fd), &info); err != nil {
     51 		return 0, 0, err
     52 	}
     53 	return int(info.Window.Right - info.Window.Left + 1), int(info.Window.Bottom - info.Window.Top + 1), nil
     54 }
     55 
     56 func readPassword(fd int) ([]byte, error) {
     57 	var st uint32
     58 	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
     59 		return nil, err
     60 	}
     61 	old := st
     62 
     63 	st &^= (windows.ENABLE_ECHO_INPUT | windows.ENABLE_LINE_INPUT)
     64 	st |= (windows.ENABLE_PROCESSED_OUTPUT | windows.ENABLE_PROCESSED_INPUT)
     65 	if err := windows.SetConsoleMode(windows.Handle(fd), st); err != nil {
     66 		return nil, err
     67 	}
     68 
     69 	defer windows.SetConsoleMode(windows.Handle(fd), old)
     70 
     71 	var h windows.Handle
     72 	p, _ := windows.GetCurrentProcess()
     73 	if err := windows.DuplicateHandle(p, windows.Handle(fd), p, &h, 0, false, windows.DUPLICATE_SAME_ACCESS); err != nil {
     74 		return nil, err
     75 	}
     76 
     77 	f := os.NewFile(uintptr(h), "stdin")
     78 	defer f.Close()
     79 	return readPasswordLine(f)
     80 }