1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
// +build windows
package pb
import (
"errors"
"fmt"
"os"
"sync"
"syscall"
"unsafe"
)
var tty = os.Stdin
var (
kernel32 = syscall.NewLazyDLL("kernel32.dll")
// GetConsoleScreenBufferInfo retrieves information about the
// specified console screen buffer.
// http://msdn.microsoft.com/en-us/library/windows/desktop/ms683171(v=vs.85).aspx
procGetConsoleScreenBufferInfo = kernel32.NewProc("GetConsoleScreenBufferInfo")
// GetConsoleMode retrieves the current input mode of a console's
// input buffer or the current output mode of a console screen buffer.
// https://msdn.microsoft.com/en-us/library/windows/desktop/ms683167(v=vs.85).aspx
getConsoleMode = kernel32.NewProc("GetConsoleMode")
// SetConsoleMode sets the input mode of a console's input buffer
// or the output mode of a console screen buffer.
// https://msdn.microsoft.com/en-us/library/windows/desktop/ms686033(v=vs.85).aspx
setConsoleMode = kernel32.NewProc("SetConsoleMode")
// SetConsoleCursorPosition sets the cursor position in the
// specified console screen buffer.
// https://msdn.microsoft.com/en-us/library/windows/desktop/ms686025(v=vs.85).aspx
setConsoleCursorPosition = kernel32.NewProc("SetConsoleCursorPosition")
)
type (
// Defines the coordinates of the upper left and lower right corners
// of a rectangle.
// See
// http://msdn.microsoft.com/en-us/library/windows/desktop/ms686311(v=vs.85).aspx
smallRect struct {
Left, Top, Right, Bottom int16
}
// Defines the coordinates of a character cell in a console screen
// buffer. The origin of the coordinate system (0,0) is at the top, left cell
// of the buffer.
// See
// http://msdn.microsoft.com/en-us/library/windows/desktop/ms682119(v=vs.85).aspx
coordinates struct {
X, Y int16
}
word int16
// Contains information about a console screen buffer.
// http://msdn.microsoft.com/en-us/library/windows/desktop/ms682093(v=vs.85).aspx
consoleScreenBufferInfo struct {
dwSize coordinates
dwCursorPosition coordinates
wAttributes word
srWindow smallRect
dwMaximumWindowSize coordinates
}
)
// terminalWidth returns width of the terminal.
func terminalWidth() (width int, err error) {
var info consoleScreenBufferInfo
_, _, e := syscall.Syscall(procGetConsoleScreenBufferInfo.Addr(), 2, uintptr(syscall.Stdout), uintptr(unsafe.Pointer(&info)), 0)
if e != 0 {
return 0, error(e)
}
return int(info.dwSize.X) - 1, nil
}
func getCursorPos() (pos coordinates, err error) {
var info consoleScreenBufferInfo
_, _, e := syscall.Syscall(procGetConsoleScreenBufferInfo.Addr(), 2, uintptr(syscall.Stdout), uintptr(unsafe.Pointer(&info)), 0)
if e != 0 {
return info.dwCursorPosition, error(e)
}
return info.dwCursorPosition, nil
}
func setCursorPos(pos coordinates) error {
_, _, e := syscall.Syscall(setConsoleCursorPosition.Addr(), 2, uintptr(syscall.Stdout), uintptr(uint32(uint16(pos.Y))<<16|uint32(uint16(pos.X))), 0)
if e != 0 {
return error(e)
}
return nil
}
var ErrPoolWasStarted = errors.New("Bar pool was started")
var echoLocked bool
var echoLockMutex sync.Mutex
var oldState word
func lockEcho() (quit chan int, err error) {
echoLockMutex.Lock()
defer echoLockMutex.Unlock()
if echoLocked {
err = ErrPoolWasStarted
return
}
echoLocked = true
if _, _, e := syscall.Syscall(getConsoleMode.Addr(), 2, uintptr(syscall.Stdout), uintptr(unsafe.Pointer(&oldState)), 0); e != 0 {
err = fmt.Errorf("Can't get terminal settings: %v", e)
return
}
newState := oldState
const ENABLE_ECHO_INPUT = 0x0004
const ENABLE_LINE_INPUT = 0x0002
newState = newState & (^(ENABLE_LINE_INPUT | ENABLE_ECHO_INPUT))
if _, _, e := syscall.Syscall(setConsoleMode.Addr(), 2, uintptr(syscall.Stdout), uintptr(newState), 0); e != 0 {
err = fmt.Errorf("Can't set terminal settings: %v", e)
return
}
return
}
func unlockEcho() (err error) {
echoLockMutex.Lock()
defer echoLockMutex.Unlock()
if !echoLocked {
return
}
echoLocked = false
if _, _, e := syscall.Syscall(setConsoleMode.Addr(), 2, uintptr(syscall.Stdout), uintptr(oldState), 0); e != 0 {
err = fmt.Errorf("Can't set terminal settings")
}
return
}
|
