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364 lines
8.7 KiB
364 lines
8.7 KiB
package liner
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import (
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"bufio"
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"os"
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"syscall"
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"unicode/utf16"
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"unsafe"
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)
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var (
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kernel32 = syscall.NewLazyDLL("kernel32.dll")
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procGetStdHandle = kernel32.NewProc("GetStdHandle")
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procReadConsoleInput = kernel32.NewProc("ReadConsoleInputW")
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procGetNumberOfConsoleInputEvents = kernel32.NewProc("GetNumberOfConsoleInputEvents")
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procGetConsoleMode = kernel32.NewProc("GetConsoleMode")
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procSetConsoleMode = kernel32.NewProc("SetConsoleMode")
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procSetConsoleCursorPosition = kernel32.NewProc("SetConsoleCursorPosition")
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procGetConsoleScreenBufferInfo = kernel32.NewProc("GetConsoleScreenBufferInfo")
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procFillConsoleOutputCharacter = kernel32.NewProc("FillConsoleOutputCharacterW")
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)
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// These names are from the Win32 api, so they use underscores (contrary to
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// what golint suggests)
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const (
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std_input_handle = uint32(-10 & 0xFFFFFFFF)
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std_output_handle = uint32(-11 & 0xFFFFFFFF)
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std_error_handle = uint32(-12 & 0xFFFFFFFF)
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invalid_handle_value = ^uintptr(0)
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)
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type inputMode uint32
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// State represents an open terminal
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type State struct {
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commonState
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handle syscall.Handle
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hOut syscall.Handle
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origMode inputMode
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defaultMode inputMode
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key interface{}
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repeat uint16
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}
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const (
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enableEchoInput = 0x4
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enableInsertMode = 0x20
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enableLineInput = 0x2
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enableMouseInput = 0x10
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enableProcessedInput = 0x1
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enableQuickEditMode = 0x40
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enableWindowInput = 0x8
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)
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// NewLiner initializes a new *State, and sets the terminal into raw mode. To
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// restore the terminal to its previous state, call State.Close().
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func NewLiner() *State {
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var s State
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hIn, _, _ := procGetStdHandle.Call(uintptr(std_input_handle))
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s.handle = syscall.Handle(hIn)
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hOut, _, _ := procGetStdHandle.Call(uintptr(std_output_handle))
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s.hOut = syscall.Handle(hOut)
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s.terminalSupported = true
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if m, err := TerminalMode(); err == nil {
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s.origMode = m.(inputMode)
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mode := s.origMode
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mode &^= enableEchoInput
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mode &^= enableInsertMode
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mode &^= enableLineInput
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mode &^= enableMouseInput
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mode |= enableWindowInput
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mode.ApplyMode()
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} else {
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s.inputRedirected = true
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s.r = bufio.NewReader(os.Stdin)
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}
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s.getColumns()
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s.outputRedirected = s.columns <= 0
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return &s
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}
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// These names are from the Win32 api, so they use underscores (contrary to
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// what golint suggests)
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const (
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focus_event = 0x0010
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key_event = 0x0001
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menu_event = 0x0008
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mouse_event = 0x0002
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window_buffer_size_event = 0x0004
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)
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type input_record struct {
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eventType uint16
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pad uint16
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blob [16]byte
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}
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type key_event_record struct {
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KeyDown int32
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RepeatCount uint16
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VirtualKeyCode uint16
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VirtualScanCode uint16
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Char uint16
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ControlKeyState uint32
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}
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// These names are from the Win32 api, so they use underscores (contrary to
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// what golint suggests)
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const (
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vk_tab = 0x09
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vk_menu = 0x12 // ALT key
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vk_prior = 0x21
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vk_next = 0x22
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vk_end = 0x23
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vk_home = 0x24
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vk_left = 0x25
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vk_up = 0x26
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vk_right = 0x27
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vk_down = 0x28
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vk_insert = 0x2d
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vk_delete = 0x2e
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vk_f1 = 0x70
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vk_f2 = 0x71
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vk_f3 = 0x72
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vk_f4 = 0x73
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vk_f5 = 0x74
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vk_f6 = 0x75
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vk_f7 = 0x76
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vk_f8 = 0x77
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vk_f9 = 0x78
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vk_f10 = 0x79
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vk_f11 = 0x7a
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vk_f12 = 0x7b
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bKey = 0x42
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dKey = 0x44
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fKey = 0x46
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yKey = 0x59
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)
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const (
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shiftPressed = 0x0010
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leftAltPressed = 0x0002
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leftCtrlPressed = 0x0008
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rightAltPressed = 0x0001
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rightCtrlPressed = 0x0004
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modKeys = shiftPressed | leftAltPressed | rightAltPressed | leftCtrlPressed | rightCtrlPressed
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)
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// inputWaiting only returns true if the next call to readNext will return immediately.
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func (s *State) inputWaiting() bool {
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var num uint32
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ok, _, _ := procGetNumberOfConsoleInputEvents.Call(uintptr(s.handle), uintptr(unsafe.Pointer(&num)))
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if ok == 0 {
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// call failed, so we cannot guarantee a non-blocking readNext
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return false
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}
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// during a "paste" input events are always an odd number, and
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// the last one results in a blocking readNext, so return false
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// when num is 1 or 0.
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return num > 1
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}
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func (s *State) readNext() (interface{}, error) {
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if s.repeat > 0 {
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s.repeat--
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return s.key, nil
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}
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var input input_record
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pbuf := uintptr(unsafe.Pointer(&input))
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var rv uint32
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prv := uintptr(unsafe.Pointer(&rv))
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var surrogate uint16
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for {
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ok, _, err := procReadConsoleInput.Call(uintptr(s.handle), pbuf, 1, prv)
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if ok == 0 {
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return nil, err
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}
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if input.eventType == window_buffer_size_event {
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xy := (*coord)(unsafe.Pointer(&input.blob[0]))
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s.columns = int(xy.x)
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return winch, nil
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}
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if input.eventType != key_event {
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continue
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}
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ke := (*key_event_record)(unsafe.Pointer(&input.blob[0]))
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if ke.KeyDown == 0 {
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if ke.VirtualKeyCode == vk_menu && ke.Char > 0 {
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// paste of unicode (eg. via ALT-numpad)
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if surrogate > 0 {
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return utf16.DecodeRune(rune(surrogate), rune(ke.Char)), nil
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} else if utf16.IsSurrogate(rune(ke.Char)) {
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surrogate = ke.Char
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continue
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} else {
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return rune(ke.Char), nil
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}
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}
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continue
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}
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if ke.VirtualKeyCode == vk_tab && ke.ControlKeyState&modKeys == shiftPressed {
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s.key = shiftTab
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} else if ke.VirtualKeyCode == bKey && (ke.ControlKeyState&modKeys == leftAltPressed ||
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ke.ControlKeyState&modKeys == rightAltPressed) {
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s.key = altB
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} else if ke.VirtualKeyCode == dKey && (ke.ControlKeyState&modKeys == leftAltPressed ||
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ke.ControlKeyState&modKeys == rightAltPressed) {
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s.key = altD
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} else if ke.VirtualKeyCode == fKey && (ke.ControlKeyState&modKeys == leftAltPressed ||
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ke.ControlKeyState&modKeys == rightAltPressed) {
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s.key = altF
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} else if ke.VirtualKeyCode == yKey && (ke.ControlKeyState&modKeys == leftAltPressed ||
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ke.ControlKeyState&modKeys == rightAltPressed) {
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s.key = altY
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} else if ke.Char > 0 {
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if surrogate > 0 {
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s.key = utf16.DecodeRune(rune(surrogate), rune(ke.Char))
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} else if utf16.IsSurrogate(rune(ke.Char)) {
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surrogate = ke.Char
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continue
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} else {
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s.key = rune(ke.Char)
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}
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} else {
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switch ke.VirtualKeyCode {
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case vk_prior:
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s.key = pageUp
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case vk_next:
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s.key = pageDown
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case vk_end:
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s.key = end
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case vk_home:
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s.key = home
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case vk_left:
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s.key = left
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if ke.ControlKeyState&(leftCtrlPressed|rightCtrlPressed) != 0 {
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if ke.ControlKeyState&modKeys == ke.ControlKeyState&(leftCtrlPressed|rightCtrlPressed) {
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s.key = wordLeft
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}
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}
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case vk_right:
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s.key = right
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if ke.ControlKeyState&(leftCtrlPressed|rightCtrlPressed) != 0 {
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if ke.ControlKeyState&modKeys == ke.ControlKeyState&(leftCtrlPressed|rightCtrlPressed) {
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s.key = wordRight
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}
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}
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case vk_up:
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s.key = up
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case vk_down:
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s.key = down
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case vk_insert:
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s.key = insert
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case vk_delete:
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s.key = del
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case vk_f1:
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s.key = f1
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case vk_f2:
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s.key = f2
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case vk_f3:
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s.key = f3
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case vk_f4:
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s.key = f4
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case vk_f5:
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s.key = f5
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case vk_f6:
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s.key = f6
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case vk_f7:
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s.key = f7
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case vk_f8:
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s.key = f8
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case vk_f9:
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s.key = f9
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case vk_f10:
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s.key = f10
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case vk_f11:
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s.key = f11
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case vk_f12:
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s.key = f12
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default:
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// Eat modifier keys
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// TODO: return Action(Unknown) if the key isn't a
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// modifier.
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continue
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}
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}
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if ke.RepeatCount > 1 {
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s.repeat = ke.RepeatCount - 1
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}
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return s.key, nil
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}
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}
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// Close returns the terminal to its previous mode
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func (s *State) Close() error {
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s.origMode.ApplyMode()
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return nil
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}
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func (s *State) startPrompt() {
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if m, err := TerminalMode(); err == nil {
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s.defaultMode = m.(inputMode)
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mode := s.defaultMode
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mode &^= enableProcessedInput
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mode.ApplyMode()
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}
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}
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func (s *State) restartPrompt() {
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}
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func (s *State) stopPrompt() {
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s.defaultMode.ApplyMode()
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}
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// TerminalSupported returns true because line editing is always
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// supported on Windows.
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func TerminalSupported() bool {
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return true
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}
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func (mode inputMode) ApplyMode() error {
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hIn, _, err := procGetStdHandle.Call(uintptr(std_input_handle))
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if hIn == invalid_handle_value || hIn == 0 {
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return err
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}
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ok, _, err := procSetConsoleMode.Call(hIn, uintptr(mode))
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if ok != 0 {
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err = nil
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}
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return err
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}
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// TerminalMode returns the current terminal input mode as an InputModeSetter.
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//
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// This function is provided for convenience, and should
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// not be necessary for most users of liner.
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func TerminalMode() (ModeApplier, error) {
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var mode inputMode
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hIn, _, err := procGetStdHandle.Call(uintptr(std_input_handle))
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if hIn == invalid_handle_value || hIn == 0 {
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return nil, err
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}
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ok, _, err := procGetConsoleMode.Call(hIn, uintptr(unsafe.Pointer(&mode)))
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if ok != 0 {
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err = nil
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}
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return mode, err
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}
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const cursorColumn = true
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