fixed xterm (added TIOCGWINSZ querying), vendored go-tty temporarily

render.go

@@ -21,7 +21,11 @@ type Drawable interface {
 }
 
 func Render(items ...Drawable) {
+	// draw background, etc for items with ANSI escape strings
 	for _, item := range items {
+		if len(item.GetANSIString()) > 0 {
+			continue
+		}
 		buf := NewBuffer(item.GetRect())
 		item.Lock()
 		item.Draw(buf)
@@ -35,12 +39,35 @@ func Render(items ...Drawable) {
 				)
 			}
 		}
+	}
+	tb.Flush()
 
-		// draw the image over the already filled cells
+	// draw images, etc over the already filled cells with ANSI escape strings (sixel, ...)
+	for _, item := range items {
 		if ansiString := item.GetANSIString(); len(ansiString) > 0 {
 			fmt.Printf("%s", ansiString)
 			continue
 		}
 	}
+
+	// draw items without ANSI strings last in case the ANSI escape strings ended messed up
+	for _, item := range items {
+		if len(item.GetANSIString()) == 0 {
+			continue
+		}
+		buf := NewBuffer(item.GetRect())
+		item.Lock()
+		item.Draw(buf)
+		item.Unlock()
+		for point, cell := range buf.CellMap {
+			if point.In(buf.Rectangle) {
+				tb.SetCell(
+					point.X, point.Y,
+					cell.Rune,
+					tb.Attribute(cell.Style.Fg+1)|tb.Attribute(cell.Style.Modifier), tb.Attribute(cell.Style.Bg+1),
+				)
+			}
+		}
+	}
 	tb.Flush()
 }

vendor/github.com/mattn/go-tty/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2018 Yasuhiro Matsumoto
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/mattn/go-tty/README.md

@@ -0,0 +1,49 @@
+# go-tty
+
+Simple tty utility
+
+## Usage
+
+```go
+tty, err := tty.Open()
+if err != nil {
+	log.Fatal(err)
+}
+defer tty.Close()
+
+for {
+	r, err := tty.ReadRune()
+	if err != nil {
+		log.Fatal(err)
+	}
+	// handle key event
+}
+```
+
+if you are on windows and want to display ANSI colors, use <a href="https://github.com/mattn/go-colorable">go-colorable</a>.
+
+```go
+tty, err := tty.Open()
+if err != nil {
+	log.Fatal(err)
+}
+defer tty.Close()
+
+out := colorable.NewColorable(tty.Output())
+
+fmt.Fprintln(out, "\x1b[2J")
+```
+
+## Installation
+
+```
+$ go get github.com/mattn/go-tty
+```
+
+## License
+
+MIT
+
+## Author
+
+Yasuhiro Matsumoto (a.k.a mattn)

vendor/github.com/mattn/go-tty/tty.go

@@ -0,0 +1,125 @@
+package tty
+
+import (
+	"os"
+	"strings"
+	"unicode"
+)
+
+func Open() (*TTY, error) {
+	return open()
+}
+
+func (tty *TTY) Raw() (func() error, error) {
+	return tty.raw()
+}
+
+func (tty *TTY) MustRaw() func() error {
+	f, err := tty.raw()
+	if err != nil {
+		panic(err.Error())
+	}
+	return f
+}
+
+func (tty *TTY) Buffered() bool {
+	return tty.buffered()
+}
+
+func (tty *TTY) ReadRune() (rune, error) {
+	return tty.readRune()
+}
+
+func (tty *TTY) Close() error {
+	return tty.close()
+}
+
+func (tty *TTY) Size() (int, int, error) {
+	x, y, err := tty.size()
+	return x, y, err
+}
+
+func (tty *TTY) SizePixel() (int, int, int, int, error) {
+	return tty.sizePixel()
+}
+
+func (tty *TTY) Input() *os.File {
+	return tty.input()
+}
+
+func (tty *TTY) Output() *os.File {
+	return tty.output()
+}
+
+// Display types.
+const (
+	displayNone = iota
+	displayRune
+	displayMask
+)
+
+func (tty *TTY) readString(displayType int) (string, error) {
+	rs := []rune{}
+loop:
+	for {
+		r, err := tty.readRune()
+		if err != nil {
+			return "", err
+		}
+		switch r {
+		case 13:
+			break loop
+		case 8, 127:
+			if len(rs) > 0 {
+				rs = rs[:len(rs)-1]
+				if displayType != displayNone {
+					tty.Output().WriteString("\b \b")
+				}
+			}
+		default:
+			if unicode.IsPrint(r) {
+				rs = append(rs, r)
+				switch displayType {
+				case displayRune:
+					tty.Output().WriteString(string(r))
+				case displayMask:
+					tty.Output().WriteString("*")
+				}
+			}
+		}
+	}
+	return string(rs), nil
+}
+
+func (tty *TTY) ReadString() (string, error) {
+	defer tty.Output().WriteString("\n")
+	return tty.readString(displayRune)
+}
+
+func (tty *TTY) ReadPassword() (string, error) {
+	defer tty.Output().WriteString("\n")
+	return tty.readString(displayMask)
+}
+
+func (tty *TTY) ReadPasswordNoEcho() (string, error) {
+	defer tty.Output().WriteString("\n")
+	return tty.readString(displayNone)
+}
+
+func (tty *TTY) ReadPasswordClear() (string, error) {
+	s, err := tty.readString(displayMask)
+	tty.Output().WriteString(
+		strings.Repeat("\b", len(s)) +
+			strings.Repeat(" ", len(s)) +
+			strings.Repeat("\b", len(s)))
+	return s, err
+}
+
+type WINSIZE struct {
+	W int
+	H int
+}
+
+func (tty *TTY) SIGWINCH() chan WINSIZE {
+	return tty.sigwinch()
+}

vendor/github.com/mattn/go-tty/tty_bsd.go

@@ -0,0 +1,12 @@
+// +build darwin dragonfly freebsd netbsd openbsd
+
+package tty
+
+import (
+	"syscall"
+)
+
+const (
+	ioctlReadTermios  = syscall.TIOCGETA
+	ioctlWriteTermios = syscall.TIOCSETA
+)

vendor/github.com/mattn/go-tty/tty_linux.go

@@ -0,0 +1,8 @@
+// +build linux
+
+package tty
+
+const (
+	ioctlReadTermios  = 0x5401 // syscall.TCGETS
+	ioctlWriteTermios = 0x5402 // syscall.TCSETS
+)

vendor/github.com/mattn/go-tty/tty_plan9.go

@@ -0,0 +1,69 @@
+package tty
+
+import (
+	"bufio"
+	"os"
+	"syscall"
+	"errors"
+)
+s
+type TTY struct {
+	in  *os.File
+	bin *bufio.Reader
+	out *os.File
+}
+
+func open() (*TTY, error) {
+	tty := new(TTY)
+
+	in, err := os.Open("/dev/cons")
+	if err != nil {
+		return nil, err
+	}
+	tty.in = in
+	tty.bin = bufio.NewReader(in)
+
+	out, err := os.OpenFile("/dev/cons", syscall.O_WRONLY, 0)
+	if err != nil {
+		return nil, err
+	}
+	tty.out = out
+
+	return tty, nil
+}
+
+func (tty *TTY) buffered() bool {
+	return tty.bin.Buffered() > 0
+}
+
+func (tty *TTY) readRune() (rune, error) {
+	r, _, err := tty.bin.ReadRune()
+	return r, err
+}
+
+func (tty *TTY) close() (err error) {
+	if err2 := tty.in.Close(); err2 != nil {
+		err = err2
+	}
+	if err2 := tty.out.Close(); err2 != nil {
+		err = err2
+	}
+	return
+}
+
+func (tty *TTY) size() (int, int, error) {
+	return 80, 24, nil
+}
+
+func (tty *TTY) sizePixel() (int, int, int, int, error) {
+	x, y, _ := tty.size()
+	return x, y, -1, -1, errors.New("no implemented method for querying size in pixels on Plan 9")
+}
+
+func (tty *TTY) input() *os.File {
+	return tty.in
+}
+
+func (tty *TTY) output() *os.File {
+	return tty.out
+}

vendor/github.com/mattn/go-tty/tty_unix.go

@@ -0,0 +1,137 @@
+// +build !windows
+// +build !plan9
+
+package tty
+
+import (
+	"bufio"
+	"os"
+	"os/signal"
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+)
+
+type TTY struct {
+	in      *os.File
+	bin     *bufio.Reader
+	out     *os.File
+	termios syscall.Termios
+	ws      chan WINSIZE
+	ss      chan os.Signal
+}
+
+func open() (*TTY, error) {
+	tty := new(TTY)
+
+	in, err := os.Open("/dev/tty")
+	if err != nil {
+		return nil, err
+	}
+	tty.in = in
+	tty.bin = bufio.NewReader(in)
+
+	out, err := os.OpenFile("/dev/tty", syscall.O_WRONLY, 0)
+	if err != nil {
+		return nil, err
+	}
+	tty.out = out
+
+	if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(tty.in.Fd()), ioctlReadTermios, uintptr(unsafe.Pointer(&tty.termios)), 0, 0, 0); err != 0 {
+		return nil, err
+	}
+	newios := tty.termios
+	newios.Iflag &^= syscall.ISTRIP | syscall.INLCR | syscall.ICRNL | syscall.IGNCR | syscall.IXON | syscall.IXOFF
+	newios.Lflag &^= syscall.ECHO | syscall.ICANON /*| syscall.ISIG*/
+	if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(tty.in.Fd()), ioctlWriteTermios, uintptr(unsafe.Pointer(&newios)), 0, 0, 0); err != 0 {
+		return nil, err
+	}
+
+	tty.ws = make(chan WINSIZE)
+	tty.ss = make(chan os.Signal, 1)
+	signal.Notify(tty.ss, syscall.SIGWINCH)
+	go func() {
+		defer close(tty.ws)
+		for sig := range tty.ss {
+			switch sig {
+			case syscall.SIGWINCH:
+				if w, h, err := tty.size(); err == nil {
+					tty.ws <- WINSIZE{
+						W: w,
+						H: h,
+					}
+				}
+			default:
+			}
+		}
+	}()
+	return tty, nil
+}
+
+func (tty *TTY) buffered() bool {
+	return tty.bin.Buffered() > 0
+}
+
+func (tty *TTY) readRune() (rune, error) {
+	r, _, err := tty.bin.ReadRune()
+	return r, err
+}
+
+func (tty *TTY) close() error {
+	signal.Stop(tty.ss)
+	close(tty.ss)
+	_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(tty.in.Fd()), ioctlWriteTermios, uintptr(unsafe.Pointer(&tty.termios)), 0, 0, 0)
+	return err
+}
+
+func (tty *TTY) size() (int, int, error) {
+	x, y, _, _, err := tty.sizePixel()
+	return x, y, err
+}
+
+func (tty *TTY) sizePixel() (int, int, int, int, error) {
+	var dim [4]uint16
+	if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(tty.out.Fd()), uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(&dim)), 0, 0, 0); err != 0 {
+		return -1, -1, -1, -1, err
+	}
+	return int(dim[1]), int(dim[0]), int(dim[2]), int(dim[3]), nil
+}
+
+func (tty *TTY) input() *os.File {
+	return tty.in
+}
+
+func (tty *TTY) output() *os.File {
+	return tty.out
+}
+
+func (tty *TTY) raw() (func() error, error) {
+	termios, err := unix.IoctlGetTermios(int(tty.in.Fd()), ioctlReadTermios)
+	if err != nil {
+		return nil, err
+	}
+	backup := *termios
+
+	termios.Iflag &^= unix.IGNBRK | unix.BRKINT | unix.PARMRK | unix.ISTRIP | unix.INLCR | unix.IGNCR | unix.ICRNL | unix.IXON
+	termios.Oflag &^= unix.OPOST
+	termios.Lflag &^= unix.ECHO | unix.ECHONL | unix.ICANON | unix.ISIG | unix.IEXTEN
+	termios.Cflag &^= unix.CSIZE | unix.PARENB
+	termios.Cflag |= unix.CS8
+	termios.Cc[unix.VMIN] = 1
+	termios.Cc[unix.VTIME] = 0
+	if err := unix.IoctlSetTermios(int(tty.in.Fd()), ioctlWriteTermios, termios); err != nil {
+		return nil, err
+	}
+
+	return func() error {
+		if err := unix.IoctlSetTermios(int(tty.in.Fd()), ioctlWriteTermios, &backup); err != nil {
+			return err
+		}
+		return nil
+	}, nil
+}
+
+func (tty *TTY) sigwinch() chan WINSIZE {
+	return tty.ws
+}

vendor/github.com/mattn/go-tty/tty_windows.go

@@ -0,0 +1,333 @@
+// +build windows
+
+package tty
+
+import (
+	"os"
+	"errors"
+	"syscall"
+	"unsafe"
+
+	"github.com/mattn/go-isatty"
+)
+
+const (
+	rightAltPressed  = 1
+	leftAltPressed   = 2
+	rightCtrlPressed = 4
+	leftCtrlPressed  = 8
+	shiftPressed     = 0x0010
+	ctrlPressed      = rightCtrlPressed | leftCtrlPressed
+	altPressed       = rightAltPressed | leftAltPressed
+)
+
+const (
+	enableProcessedInput = 0x1
+	enableLineInput      = 0x2
+	enableEchoInput      = 0x4
+	enableWindowInput    = 0x8
+	enableMouseInput     = 0x10
+	enableInsertMode     = 0x20
+	enableQuickEditMode  = 0x40
+	enableExtendedFlag   = 0x80
+
+	enableProcessedOutput = 1
+	enableWrapAtEolOutput = 2
+
+	keyEvent              = 0x1
+	mouseEvent            = 0x2
+	windowBufferSizeEvent = 0x4
+)
+
+var kernel32 = syscall.NewLazyDLL("kernel32.dll")
+
+var (
+	procAllocConsole                = kernel32.NewProc("AllocConsole")
+	procSetStdHandle                = kernel32.NewProc("SetStdHandle")
+	procGetStdHandle                = kernel32.NewProc("GetStdHandle")
+	procSetConsoleScreenBufferSize  = kernel32.NewProc("SetConsoleScreenBufferSize")
+	procCreateConsoleScreenBuffer   = kernel32.NewProc("CreateConsoleScreenBuffer")
+	procGetConsoleScreenBufferInfo  = kernel32.NewProc("GetConsoleScreenBufferInfo")
+	procWriteConsoleOutputCharacter = kernel32.NewProc("WriteConsoleOutputCharacterW")
+	procWriteConsoleOutputAttribute = kernel32.NewProc("WriteConsoleOutputAttribute")
+	procGetConsoleCursorInfo        = kernel32.NewProc("GetConsoleCursorInfo")
+	procSetConsoleCursorInfo        = kernel32.NewProc("SetConsoleCursorInfo")
+	procSetConsoleCursorPosition    = kernel32.NewProc("SetConsoleCursorPosition")
+	procReadConsoleInput            = kernel32.NewProc("ReadConsoleInputW")
+	procGetConsoleMode              = kernel32.NewProc("GetConsoleMode")
+	procSetConsoleMode              = kernel32.NewProc("SetConsoleMode")
+	procFillConsoleOutputCharacter  = kernel32.NewProc("FillConsoleOutputCharacterW")
+	procFillConsoleOutputAttribute  = kernel32.NewProc("FillConsoleOutputAttribute")
+	procScrollConsoleScreenBuffer   = kernel32.NewProc("ScrollConsoleScreenBufferW")
+)
+
+type wchar uint16
+type short int16
+type dword uint32
+type word uint16
+
+type coord struct {
+	x short
+	y short
+}
+
+type smallRect struct {
+	left   short
+	top    short
+	right  short
+	bottom short
+}
+
+type consoleScreenBufferInfo struct {
+	size              coord
+	cursorPosition    coord
+	attributes        word
+	window            smallRect
+	maximumWindowSize coord
+}
+
+type consoleCursorInfo struct {
+	size    dword
+	visible int32
+}
+
+type inputRecord struct {
+	eventType word
+	_         [2]byte
+	event     [16]byte
+}
+
+type keyEventRecord struct {
+	keyDown         int32
+	repeatCount     word
+	virtualKeyCode  word
+	virtualScanCode word
+	unicodeChar     wchar
+	controlKeyState dword
+}
+
+type windowBufferSizeRecord struct {
+	size coord
+}
+
+type mouseEventRecord struct {
+	mousePos        coord
+	buttonState     dword
+	controlKeyState dword
+	eventFlags      dword
+}
+
+type charInfo struct {
+	unicodeChar wchar
+	attributes  word
+}
+
+type TTY struct {
+	in  *os.File
+	out *os.File
+	st  uint32
+	rs  []rune
+	ws  chan WINSIZE
+}
+
+func readConsoleInput(fd uintptr, record *inputRecord) (err error) {
+	var w uint32
+	r1, _, err := procReadConsoleInput.Call(fd, uintptr(unsafe.Pointer(record)), 1, uintptr(unsafe.Pointer(&w)))
+	if r1 == 0 {
+		return err
+	}
+	return nil
+}
+
+func open() (*TTY, error) {
+	tty := new(TTY)
+	if false && isatty.IsTerminal(os.Stdin.Fd()) {
+		tty.in = os.Stdin
+	} else {
+		in, err := syscall.Open("CONIN$", syscall.O_RDWR, 0)
+		if err != nil {
+			return nil, err
+		}
+
+		tty.in = os.NewFile(uintptr(in), "/dev/tty")
+	}
+
+	if isatty.IsTerminal(os.Stdout.Fd()) {
+		tty.out = os.Stdout
+	} else {
+		procAllocConsole.Call()
+		out, err := syscall.Open("CONOUT$", syscall.O_RDWR, 0)
+		if err != nil {
+			return nil, err
+		}
+
+		tty.out = os.NewFile(uintptr(out), "/dev/tty")
+	}
+
+	h := tty.in.Fd()
+	var st uint32
+	r1, _, err := procGetConsoleMode.Call(h, uintptr(unsafe.Pointer(&st)))
+	if r1 == 0 {
+		return nil, err
+	}
+	tty.st = st
+
+	st &^= enableEchoInput
+	st &^= enableInsertMode
+	st &^= enableLineInput
+	st &^= enableMouseInput
+	st &^= enableWindowInput
+	st &^= enableExtendedFlag
+	st &^= enableQuickEditMode
+
+	// ignore error
+	procSetConsoleMode.Call(h, uintptr(st))
+
+	tty.ws = make(chan WINSIZE)
+
+	return tty, nil
+}
+
+func (tty *TTY) buffered() bool {
+	return len(tty.rs) > 0
+}
+
+func (tty *TTY) readRune() (rune, error) {
+	if len(tty.rs) > 0 {
+		r := tty.rs[0]
+		tty.rs = tty.rs[1:]
+		return r, nil
+	}
+	var ir inputRecord
+	err := readConsoleInput(tty.in.Fd(), &ir)
+	if err != nil {
+		return 0, err
+	}
+
+	switch ir.eventType {
+	case windowBufferSizeEvent:
+		wr := (*windowBufferSizeRecord)(unsafe.Pointer(&ir.event))
+		tty.ws <- WINSIZE{
+			W: int(wr.size.x),
+			H: int(wr.size.y),
+		}
+	case keyEvent:
+		kr := (*keyEventRecord)(unsafe.Pointer(&ir.event))
+		if kr.keyDown != 0 {
+			if kr.controlKeyState&altPressed != 0 && kr.unicodeChar > 0 {
+				tty.rs = []rune{rune(kr.unicodeChar)}
+				return rune(0x1b), nil
+			}
+			if kr.unicodeChar > 0 {
+				if kr.controlKeyState&shiftPressed != 0 {
+					switch kr.unicodeChar {
+					case 0x09:
+						tty.rs = []rune{0x5b, 0x5a}
+						return rune(0x1b), nil
+					}
+				}
+				return rune(kr.unicodeChar), nil
+			}
+			vk := kr.virtualKeyCode
+			switch vk {
+			case 0x21: // page-up
+				tty.rs = []rune{0x5b, 0x35, 0x7e}
+				return rune(0x1b), nil
+			case 0x22: // page-down
+				tty.rs = []rune{0x5b, 0x36, 0x7e}
+				return rune(0x1b), nil
+			case 0x23: // end
+				tty.rs = []rune{0x5b, 0x46}
+				return rune(0x1b), nil
+			case 0x24: // home
+				tty.rs = []rune{0x5b, 0x48}
+				return rune(0x1b), nil
+			case 0x25: // left
+				tty.rs = []rune{0x5b, 0x44}
+				return rune(0x1b), nil
+			case 0x26: // up
+				tty.rs = []rune{0x5b, 0x41}
+				return rune(0x1b), nil
+			case 0x27: // right
+				tty.rs = []rune{0x5b, 0x43}
+				return rune(0x1b), nil
+			case 0x28: // down
+				tty.rs = []rune{0x5b, 0x42}
+				return rune(0x1b), nil
+			case 0x2e: // delete
+				tty.rs = []rune{0x5b, 0x33, 0x7e}
+				return rune(0x1b), nil
+			case 0x70, 0x71, 0x72, 0x73: // F1,F2,F3,F4
+				tty.rs = []rune{0x5b, 0x4f, rune(vk) - 0x20}
+				return rune(0x1b), nil
+			case 0x074, 0x75, 0x76, 0x77: // F5,F6,F7,F8
+				tty.rs = []rune{0x5b, 0x31, rune(vk) - 0x3f, 0x7e}
+				return rune(0x1b), nil
+			case 0x78, 0x79: // F9,F10
+				tty.rs = []rune{0x5b, 0x32, rune(vk) - 0x48, 0x7e}
+				return rune(0x1b), nil
+			case 0x7a, 0x7b: // F11,F12
+				tty.rs = []rune{0x5b, 0x32, rune(vk) - 0x47, 0x7e}
+				return rune(0x1b), nil
+			}
+			return 0, nil
+		}
+	}
+	return 0, nil
+}
+
+func (tty *TTY) close() error {
+	close(tty.ws)
+	procSetConsoleMode.Call(tty.in.Fd(), uintptr(tty.st))
+	return nil
+}
+
+func (tty *TTY) size() (int, int, error) {
+	var csbi consoleScreenBufferInfo
+	r1, _, err := procGetConsoleScreenBufferInfo.Call(tty.out.Fd(), uintptr(unsafe.Pointer(&csbi)))
+	if r1 == 0 {
+			return 0, 0, err
+	}
+	return int(csbi.window.right - csbi.window.left + 1), int(csbi.window.bottom - csbi.window.top + 1), nil
+}
+
+func (tty *TTY) sizePixel() (int, int, int, int, error) {
+	x, y, err := tty.size()
+	if err != nil {
+		x = -1
+		y = -1
+	}
+	return x, y, -1, -1, errors.New("no implemented method for querying size in pixels on Windows")
+}
+
+func (tty *TTY) input() *os.File {
+	return tty.in
+}
+
+func (tty *TTY) output() *os.File {
+	return tty.out
+}
+
+func (tty *TTY) raw() (func() error, error) {
+	var st uint32
+	r1, _, err := procGetConsoleMode.Call(tty.in.Fd(), uintptr(unsafe.Pointer(&st)))
+	if r1 == 0 {
+		return nil, err
+	}
+	mode := st &^ (enableEchoInput | enableProcessedInput | enableLineInput | enableProcessedOutput)
+	r1, _, err = procSetConsoleMode.Call(tty.in.Fd(), uintptr(mode))
+	if r1 == 0 {
+		return nil, err
+	}
+	return func() error {
+		r1, _, err := procSetConsoleMode.Call(tty.in.Fd(), uintptr(st))
+		if r1 == 0 {
+			return err
+		}
+		return nil
+	}, nil
+}
+
+func (tty *TTY) sigwinch() chan WINSIZE {
+	return tty.ws
+}

widgets/image.go

@@ -35,24 +35,22 @@ type Image struct {
 var (
 	sixelCapable, isIterm2                      bool
 	charBoxWidthInPixels, charBoxHeightInPixels float64
+	charBoxWidthColumns,  charBoxHeightRows     int
 	lastImageDimensions                         image.Rectangle
 )
 
 func init() {
 	// example query: "\033[0c"
-	// possible answer from the terminal (here xterm): "\033[[?63;1;2;4;6;9;15;22c"
+	// possible answer from the terminal (here xterm): "\033[[?63;1;2;4;6;9;15;22c", vte(?): ...62,9;c
 	// the "4" signals that the terminal is capable of sixel
 	// conhost.exe knows this sequence.
 	termCapabilities := queryTerm("\033[0c")
 	for i, cap := range termCapabilities {
-		if i == 0 || i == len(termCapabilities)-1 {
+		if i == 0 || i == len(termCapabilities) - 1 {
 			continue
 		}
 		if string(cap) == `4` {
 			sixelCapable = true
-
-			// terminal character box size measured in pixels
-			charBoxWidthInPixels, charBoxHeightInPixels = getTermCharBoxSize()
 		}
 	}
 	// # https://superuser.com/a/683971
@@ -79,9 +77,10 @@ func (self *Image) Draw(buf *Buffer) {
 		}
 	}
 
-	// urxvt pixbuf / ...
-
 	// fall back - draw with box characters
+	// possible enhancement: make use of further box characters like chafa:
+	// https://hpjansson.org/chafa/
+	// https://github.com/hpjansson/chafa/
 	self.drawFallBack(buf)
 }
 
@@ -269,27 +268,49 @@ func (self *Image) drawANSI(buf *Buffer) (err error) {
 	imageWidthInColumns := self.Inner.Dx()
 	imageHeightInRows   := self.Inner.Dy()
 
+	// terminal size in cells and pixels and calculated terminal character box size in pixels
+	var termWidthInColumns, termHeightInRows int
+	var charBoxWidthInPixelsTemp, charBoxHeightInPixelsTemp float64
+	termWidthInColumns, termHeightInRows, _, _, charBoxWidthInPixelsTemp, charBoxHeightInPixelsTemp, err = getTermSize()
+	if err != nil {
+		return err
+	}
+	// update if value is more precise
+	if termWidthInColumns > charBoxWidthColumns {
+		charBoxWidthInPixels = charBoxWidthInPixelsTemp
+	}
+	if termHeightInRows > charBoxHeightRows {
+		charBoxHeightInPixels = charBoxHeightInPixelsTemp
+	}
+
 	// calculate image size in pixels
-	imageWidthInPixels  := int(float64(imageWidthInColumns) * charBoxWidthInPixels)
-	imageHeightInPixels := int(float64(imageHeightInRows)   * charBoxHeightInPixels)
+	// subtract 1 pixel for small deviations from char box size (float64)
+	imageWidthInPixels  := int(float64(imageWidthInColumns) * charBoxWidthInPixels)  - 1
+	imageHeightInPixels := int(float64(imageHeightInRows)   * charBoxHeightInPixels) - 1
 	if imageWidthInPixels == 0 || imageHeightInPixels == 0 {
 		return fmt.Errorf("could not calculate the image size in pixels")
 	}
 
-	termWidthInColumns, termHeightInRows := getTermSizeInChars()
-
 	// handle only partially displayed image
 	// otherwise we get scrolling
-	var needsCrop bool
-	imgCroppedWidth  := imageWidthInPixels
-	imgCroppedHeight := imageHeightInPixels
-	if self.Max.X > int(termWidthInColumns)+1 {
-		imgCroppedWidth = int(float64(int(termWidthInColumns)-self.Inner.Min.X) * charBoxWidthInPixels)
-		needsCrop = true
+	var needsCropX, needsCropY bool
+	var imgCroppedWidth, imgCroppedHeight int
+	imgCroppedWidth  = imageWidthInPixels
+	imgCroppedHeight = imageHeightInPixels
+	if self.Max.Y >= int(termHeightInRows) {
+		var scrollExtraRows int
+		// remove last 2 rows for xterm when cropped vertically to prevent scrolling
+		if len(os.Getenv("XTERM_VERSION")) > 0 {
+			scrollExtraRows = 2
+		}
+		// subtract 1 pixel for small deviations from char box size (float64)
+		imgCroppedHeight = int(float64(int(termHeightInRows) - self.Inner.Min.Y - scrollExtraRows) * charBoxHeightInPixels) - 1
+		needsCropY = true
 	}
-	if self.Max.Y > int(termHeightInRows)+1 {
-		imgCroppedHeight = int(float64(int(termHeightInRows)-self.Inner.Min.Y) * charBoxHeightInPixels)
-		needsCrop = true
+	if self.Max.X >= int(termWidthInColumns) {
+		var scrollExtraColumns int
+		imgCroppedWidth = int(float64(int(termWidthInColumns) - self.Inner.Min.X - scrollExtraColumns) * charBoxWidthInPixels) - 1
+		needsCropX = true
 	}
 
 	// this is meant for comparison and for positioning in the ANSI string
@@ -304,7 +325,7 @@ func (self *Image) drawANSI(buf *Buffer) (err error) {
 
 	// resize and crop the image //
 	img := imaging.Resize(self.Image, imageWidthInPixels, imageHeightInPixels, imaging.Lanczos)
-	if needsCrop {
+	if needsCropX || needsCropY {
 		img = imaging.Crop(img, image.Rectangle{Min: image.Point{X: 0, Y: 0}, Max: image.Point{X: imgCroppedWidth, Y: imgCroppedHeight}})
 	}
 
@@ -330,7 +351,15 @@ func (self *Image) drawANSI(buf *Buffer) (err error) {
 	}
 	skipIterm2:
 
+	// possible enhancements:
+	// kitty https://sw.kovidgoyal.net/kitty/graphics-protocol.html
+	// Terminology (from Enlightenment) https://www.enlightenment.org/docs/apps/terminology.md#tycat https://github.com/billiob/terminology
+	// urxvt pixbuf / ...
+	//
+	// Tektronix 4014, ReGis
+
 	// sixel
+	// https://vt100.net/docs/vt3xx-gp/chapter14.html
 	if sixelCapable {
 		byteBuf := new(bytes.Buffer)
 		enc := sixel.NewEncoder(byteBuf)
@@ -338,12 +367,12 @@ func (self *Image) drawANSI(buf *Buffer) (err error) {
 		if err := enc.Encode(img); err != nil {
 			return err
 		}
-
 		// position where the image should appear (upper left corner) + sixel
 		// https://github.com/mintty/mintty/wiki/CtrlSeqs#sixel-graphics-end-position
 		// "\033[?8452h" sets the cursor next right to the bottom of the image instead of below
 		// this prevents vertical scrolling when the image fills the last line.
 		// horizontal scrolling because of this did not happen in my test cases.
+		// "\033[?80l" disables sixel scrolling if it isn't already.
 		self.Block.ANSIString = fmt.Sprintf("\033[%d;%dH\033[?8452h%s", imageDimensions.Min.Y, imageDimensions.Min.X, byteBuf.String())
 		// test string "HI"
 		// self.Block.ANSIString = fmt.Sprintf("\033[%d;%dH\033[?8452h%s", self.Inner.Min.Y+1, self.Inner.Min.X+1, "\033Pq#0;2;0;0;0#1;2;100;100;0#2;2;0;100;0#1~~@@vv@@~~@@~~$#2??}}GG}}??}}??-#1!14@\033\\")
@@ -354,16 +383,44 @@ func (self *Image) drawANSI(buf *Buffer) (err error) {
 	return errors.New("no method applied for ANSI drawing")
 }
 
-func getTermCharBoxSize() (x, y float64) {
-	if cx, cy := getTermSizeInChars(); cx != 0 && cy != 0 {
-		px, py := getTermSizeInPixels()
-		x = float64(px) / float64(cx)
-		y = float64(py) / float64(cy)
+func getTermSize() (termWidthInColumns, termHeightInRows, termWidthInPixels, termHeightInPixels int, charBoxWidthInPixels, charBoxHeightInPixels float64, err error) {
+	// this uses a combination of TIOCGWINSZ and \033[14t , \033[18t
+	// the syscall to TIOCGWINSZ only works locally
+
+	var cx, cy, px, py int
+	err = nil
+
+	t, err := tty.Open()
+	defer t.Close()
+
+	cx, cy, px, py, err = t.SizePixel()
+	if err == nil {
+		if cx > 0 && cy > 0 {
+			if px <= 0 || py <= 0 {
+				px, py = getTermSizeInPixels()
+			}
+		} else {
+			if cx, cy = getTermSizeInChars(); cx != 0 && cy != 0 {
+				if px <= 0 || py <= 0 {
+					px, py = getTermSizeInPixels()
+				}
+			} else {
+				return
+			}
+		}
+
 	}
+
+	termWidthInColumns    = cx
+	termHeightInRows      = cy
+	termWidthInPixels     = px
+	termHeightInPixels    = py
+	charBoxWidthInPixels  = float64(px) / float64(cx)
+	charBoxHeightInPixels = float64(py) / float64(cy)
 	return
 }
 
-func getTermSizeInChars() (x, y uint) {
+func getTermSizeInChars() (x, y int) {
 	// query terminal size in character boxes
 	// answer: <termHeightInRows>;<termWidthInColumns>t
 	q := queryTerm("\033[18t")
@@ -374,8 +431,8 @@ func getTermSizeInChars() (x, y uint) {
 
 	if yy, err := strconv.Atoi(string(q[1])); err == nil {
 		if xx, err := strconv.Atoi(string(q[2])); err == nil {
-			x = uint(xx)
-			y = uint(yy)
+			x = xx
+			y = yy
 		} else {
 			return
 		}
@@ -386,7 +443,7 @@ func getTermSizeInChars() (x, y uint) {
 	return
 }
 
-func getTermSizeInPixels() (x, y uint) {
+func getTermSizeInPixels() (x, y int) {
 	// query terminal size in pixels
 	// answer: <termHeightInPixels>;<termWidthInPixels>t
 	q := queryTerm("\033[14t")
@@ -397,8 +454,8 @@ func getTermSizeInPixels() (x, y uint) {
 
 	if yy, err := strconv.Atoi(string(q[1])); err == nil {
 		if xx, err := strconv.Atoi(string(q[2])); err == nil {
-			x = uint(xx)
-			y = uint(yy)
+			x = xx
+			y = yy
 		} else {
 			return
 		}
@@ -410,29 +467,29 @@ func getTermSizeInPixels() (x, y uint) {
 }
 
 func queryTerm(qs string) (ret [][]rune) {
-	// temporary fix for xterm
+	// temporary fix for xterm - not completely sure if still needed
 	// otherwise TUI wouldn't react to any further events
 	// resizing still works though
-	if len(os.Getenv("XTERM_VERSION")) > 0 {
+	if len(os.Getenv("XTERM_VERSION")) > 0 && qs != "\033[0c" {
 		return
 	}
 
 	var b []rune
 
-	tty, err := tty.Open()
+	t, err := tty.Open()
 	if err != nil {
 		return
 	}
-	defer tty.Close()
 
 	ch := make(chan bool, 1)
 
 	go func() {
+		defer t.Close()
 		// query terminal
 		fmt.Printf(qs)
 
 		for {
-			r, err := tty.ReadRune()
+			r, err := t.ReadRune()
 			if err != nil {
 				return
 			}
@@ -452,7 +509,8 @@ func queryTerm(qs string) (ret [][]rune) {
 		ch <- true
 	}()
 
-	timer := time.NewTimer(50 * time.Millisecond)
+	// on my system the terminals mlterm, xterm need at least around 100 microseconds
+	timer := time.NewTimer(500 * time.Microsecond)
 	defer timer.Stop()
 
 	select {