termui: migrate to awesome-gocui instead of the old fork I had

23 files changed, 3342 insertions, 0 deletions

diff --git a/vendor/github.com/awesome-gocui/termbox-go/AUTHORS b/vendor/github.com/awesome-gocui/termbox-go/AUTHORS
new file mode 100644
index 00000000..fe26fb0f
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/AUTHORS
@@ -0,0 +1,4 @@
+# Please keep this file sorted.
+
+Georg Reinke <guelfey@googlemail.com>
+nsf <no.smile.face@gmail.com>
diff --git a/vendor/github.com/awesome-gocui/termbox-go/LICENSE b/vendor/github.com/awesome-gocui/termbox-go/LICENSE
new file mode 100644
index 00000000..d9bc068c
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/LICENSE
@@ -0,0 +1,19 @@
+Copyright (C) 2012 termbox-go authors
+
+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.
diff --git a/vendor/github.com/awesome-gocui/termbox-go/README.md b/vendor/github.com/awesome-gocui/termbox-go/README.md
new file mode 100644
index 00000000..734aab73
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/README.md
@@ -0,0 +1,49 @@
+[![GoDoc](https://godoc.org/github.com/nsf/termbox-go?status.svg)](http://godoc.org/github.com/nsf/termbox-go)
+
+## IMPORTANT
+
+This library is somewhat not maintained anymore. But I'm glad that it did what I wanted the most. It moved people away from "ncurses" mindset and these days we see both re-implementations of termbox API in various languages and even possibly better libs with similar API design. If you're looking for a Go lib that provides terminal-based user interface facilities, I've heard that https://github.com/gdamore/tcell is good (never used it myself). Also for more complicated interfaces and/or computer games I recommend you to consider using HTML-based UI. Having said that, termbox still somewhat works. In fact I'm writing this line of text right now in godit (which is a text editor written using termbox-go). So, be aware. Good luck and have a nice day.
+
+## Termbox
+Termbox is a library that provides a minimalistic API which allows the programmer to write text-based user interfaces. The library is crossplatform and has both terminal-based implementations on *nix operating systems and a winapi console based implementation for windows operating systems. The basic idea is an abstraction of the greatest common subset of features available on all major terminals and other terminal-like APIs in a minimalistic fashion. Small API means it is easy to implement, test, maintain and learn it, that's what makes the termbox a distinct library in its area.
+
+### Installation
+Install and update this go package with `go get -u github.com/nsf/termbox-go`
+
+### Examples
+For examples of what can be done take a look at demos in the _demos directory. You can try them with go run: `go run _demos/keyboard.go`
+
+There are also some interesting projects using termbox-go:
+ - [godit](https://github.com/nsf/godit) is an emacsish lightweight text editor written using termbox.
+ - [gotetris](https://github.com/jjinux/gotetris) is an implementation of Tetris.
+ - [sokoban-go](https://github.com/rn2dy/sokoban-go) is an implementation of sokoban game.
+ - [hecate](https://github.com/evanmiller/hecate) is a hex editor designed by Satan.
+ - [httopd](https://github.com/verdverm/httopd) is top for httpd logs.
+ - [mop](https://github.com/mop-tracker/mop) is stock market tracker for hackers.
+ - [termui](https://github.com/gizak/termui) is a terminal dashboard.
+ - [termdash](https://github.com/mum4k/termdash) is a terminal dashboard.
+ - [termloop](https://github.com/JoelOtter/termloop) is a terminal game engine.
+ - [xterm-color-chart](https://github.com/kutuluk/xterm-color-chart) is a XTerm 256 color chart.
+ - [gocui](https://github.com/jroimartin/gocui) is a minimalist Go library aimed at creating console user interfaces.
+ - [dry](https://github.com/moncho/dry) is an interactive cli to manage Docker containers.
+ - [pxl](https://github.com/ichinaski/pxl) displays images in the terminal.
+ - [snake-game](https://github.com/DyegoCosta/snake-game) is an implementation of the Snake game.
+ - [gone](https://github.com/guillaumebreton/gone) is a CLI pomodoro® timer.
+ - [Spoof.go](https://github.com/sabey/spoofgo) controllable movement spoofing from the cli
+ - [lf](https://github.com/gokcehan/lf) is a terminal file manager
+ - [rat](https://github.com/ericfreese/rat) lets you compose shell commands to build terminal applications.
+ - [httplab](https://github.com/gchaincl/httplab) An interactive web server.
+ - [tetris](https://github.com/MichaelS11/tetris) Go Tetris with AI option
+ - [wot](https://github.com/kyu-suke/wot) Wait time during command is completed.
+ - [2048-go](https://github.com/1984weed/2048-go) is 2048 in Go
+ - [jv](https://github.com/maxzender/jv) helps you view JSON on the command-line.
+ - [pinger](https://github.com/hirose31/pinger) helps you to monitor numerous hosts using ICMP ECHO_REQUEST.
+ - [vixl44](https://github.com/sebashwa/vixl44) lets you create pixel art inside your terminal using vim movements
+ - [zterm](https://github.com/varunrau/zterm) is a typing game inspired by http://zty.pe/
+ - [gotypist](https://github.com/pb-/gotypist) is a fun touch-typing tutor following Steve Yegge's method.
+ - [cointop](https://github.com/miguelmota/cointop) is an interactive terminal based UI application for tracking cryptocurrencies.
+ - [pexpo](https://github.com/nnao45/pexpo) is a terminal sending ping tool written in Go.
+ - [jid](https://github.com/simeji/jid) is an interactive JSON drill down tool using filtering queries like jq.
+
+### API reference
+[godoc.org/github.com/nsf/termbox-go](http://godoc.org/github.com/nsf/termbox-go)
diff --git a/vendor/github.com/awesome-gocui/termbox-go/api.go b/vendor/github.com/awesome-gocui/termbox-go/api.go
new file mode 100644
index 00000000..a461fc27
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/api.go
@@ -0,0 +1,506 @@
+// +build !windows
+
+package termbox
+
+import "github.com/mattn/go-runewidth"
+import "fmt"
+import "os"
+import "os/signal"
+import "syscall"
+import "runtime"
+import "time"
+
+// public API
+
+// Initializes termbox library. This function should be called before any other functions.
+// After successful initialization, the library must be finalized using 'Close' function.
+//
+// Example usage:
+//      err := termbox.Init()
+//      if err != nil {
+//              panic(err)
+//      }
+//      defer termbox.Close()
+func Init() error {
+	var err error
+
+	if runtime.GOOS == "openbsd" {
+		out, err = os.OpenFile("/dev/tty", os.O_RDWR, 0)
+		if err != nil {
+			return err
+		}
+		in = int(out.Fd())
+	} else {
+		out, err = os.OpenFile("/dev/tty", os.O_WRONLY, 0)
+		if err != nil {
+			return err
+		}
+		in, err = syscall.Open("/dev/tty", syscall.O_RDONLY, 0)
+		if err != nil {
+			return err
+		}
+	}
+
+	err = setup_term()
+	if err != nil {
+		return fmt.Errorf("termbox: error while reading terminfo data: %v", err)
+	}
+
+	signal.Notify(sigwinch, syscall.SIGWINCH)
+	signal.Notify(sigio, syscall.SIGIO)
+
+	_, err = fcntl(in, syscall.F_SETFL, syscall.O_ASYNC|syscall.O_NONBLOCK)
+	if err != nil {
+		return err
+	}
+	_, err = fcntl(in, syscall.F_SETOWN, syscall.Getpid())
+	if runtime.GOOS != "darwin" && err != nil {
+		return err
+	}
+	err = tcgetattr(out.Fd(), &orig_tios)
+	if err != nil {
+		return err
+	}
+
+	tios := orig_tios
+	tios.Iflag &^= syscall_IGNBRK | syscall_BRKINT | syscall_PARMRK |
+		syscall_ISTRIP | syscall_INLCR | syscall_IGNCR |
+		syscall_ICRNL | syscall_IXON
+	tios.Lflag &^= syscall_ECHO | syscall_ECHONL | syscall_ICANON |
+		syscall_ISIG | syscall_IEXTEN
+	tios.Cflag &^= syscall_CSIZE | syscall_PARENB
+	tios.Cflag |= syscall_CS8
+	tios.Cc[syscall_VMIN] = 1
+	tios.Cc[syscall_VTIME] = 0
+
+	err = tcsetattr(out.Fd(), &tios)
+	if err != nil {
+		return err
+	}
+
+	out.WriteString(funcs[t_enter_ca])
+	out.WriteString(funcs[t_enter_keypad])
+	out.WriteString(funcs[t_hide_cursor])
+	out.WriteString(funcs[t_clear_screen])
+
+	termw, termh = get_term_size(out.Fd())
+	back_buffer.init(termw, termh)
+	front_buffer.init(termw, termh)
+	back_buffer.clear()
+	front_buffer.clear()
+
+	go func() {
+		buf := make([]byte, 128)
+		for {
+			select {
+			case <-sigio:
+				for {
+					n, err := syscall.Read(in, buf)
+					if err == syscall.EAGAIN || err == syscall.EWOULDBLOCK {
+						break
+					}
+					select {
+					case input_comm <- input_event{buf[:n], err}:
+						ie := <-input_comm
+						buf = ie.data[:128]
+					case <-quit:
+						return
+					}
+				}
+			case <-quit:
+				return
+			}
+		}
+	}()
+
+	IsInit = true
+	return nil
+}
+
+// Interrupt an in-progress call to PollEvent by causing it to return
+// EventInterrupt.  Note that this function will block until the PollEvent
+// function has successfully been interrupted.
+func Interrupt() {
+	interrupt_comm <- struct{}{}
+}
+
+// Finalizes termbox library, should be called after successful initialization
+// when termbox's functionality isn't required anymore.
+func Close() {
+	quit <- 1
+	out.WriteString(funcs[t_show_cursor])
+	out.WriteString(funcs[t_sgr0])
+	out.WriteString(funcs[t_clear_screen])
+	out.WriteString(funcs[t_exit_ca])
+	out.WriteString(funcs[t_exit_keypad])
+	out.WriteString(funcs[t_exit_mouse])
+	tcsetattr(out.Fd(), &orig_tios)
+
+	out.Close()
+	syscall.Close(in)
+
+	// reset the state, so that on next Init() it will work again
+	termw = 0
+	termh = 0
+	input_mode = InputEsc
+	out = nil
+	in = 0
+	lastfg = attr_invalid
+	lastbg = attr_invalid
+	lastx = coord_invalid
+	lasty = coord_invalid
+	cursor_x = cursor_hidden
+	cursor_y = cursor_hidden
+	foreground = ColorDefault
+	background = ColorDefault
+	IsInit = false
+}
+
+// Synchronizes the internal back buffer with the terminal.
+func Flush() error {
+	// invalidate cursor position
+	lastx = coord_invalid
+	lasty = coord_invalid
+
+	update_size_maybe()
+
+	for y := 0; y < front_buffer.height; y++ {
+		line_offset := y * front_buffer.width
+		for x := 0; x < front_buffer.width; {
+			cell_offset := line_offset + x
+			back := &back_buffer.cells[cell_offset]
+			front := &front_buffer.cells[cell_offset]
+			if back.Ch < ' ' {
+				back.Ch = ' '
+			}
+			w := runewidth.RuneWidth(back.Ch)
+			if w == 0 || w == 2 && runewidth.IsAmbiguousWidth(back.Ch) {
+				w = 1
+			}
+			if *back == *front {
+				x += w
+				continue
+			}
+			*front = *back
+			send_attr(back.Fg, back.Bg)
+
+			if w == 2 && x == front_buffer.width-1 {
+				// there's not enough space for 2-cells rune,
+				// let's just put a space in there
+				send_char(x, y, ' ')
+			} else {
+				send_char(x, y, back.Ch)
+				if w == 2 {
+					next := cell_offset + 1
+					front_buffer.cells[next] = Cell{
+						Ch: 0,
+						Fg: back.Fg,
+						Bg: back.Bg,
+					}
+				}
+			}
+			x += w
+		}
+	}
+	if !is_cursor_hidden(cursor_x, cursor_y) {
+		write_cursor(cursor_x, cursor_y)
+	}
+	return flush()
+}
+
+// Sets the position of the cursor. See also HideCursor().
+func SetCursor(x, y int) {
+	if is_cursor_hidden(cursor_x, cursor_y) && !is_cursor_hidden(x, y) {
+		outbuf.WriteString(funcs[t_show_cursor])
+	}
+
+	if !is_cursor_hidden(cursor_x, cursor_y) && is_cursor_hidden(x, y) {
+		outbuf.WriteString(funcs[t_hide_cursor])
+	}
+
+	cursor_x, cursor_y = x, y
+	if !is_cursor_hidden(cursor_x, cursor_y) {
+		write_cursor(cursor_x, cursor_y)
+	}
+}
+
+// The shortcut for SetCursor(-1, -1).
+func HideCursor() {
+	SetCursor(cursor_hidden, cursor_hidden)
+}
+
+// Changes cell's parameters in the internal back buffer at the specified
+// position.
+func SetCell(x, y int, ch rune, fg, bg Attribute) {
+	if x < 0 || x >= back_buffer.width {
+		return
+	}
+	if y < 0 || y >= back_buffer.height {
+		return
+	}
+
+	back_buffer.cells[y*back_buffer.width+x] = Cell{ch, fg, bg}
+}
+
+// Returns a slice into the termbox's back buffer. You can get its dimensions
+// using 'Size' function. The slice remains valid as long as no 'Clear' or
+// 'Flush' function calls were made after call to this function.
+func CellBuffer() []Cell {
+	return back_buffer.cells
+}
+
+// After getting a raw event from PollRawEvent function call, you can parse it
+// again into an ordinary one using termbox logic. That is parse an event as
+// termbox would do it. Returned event in addition to usual Event struct fields
+// sets N field to the amount of bytes used within 'data' slice. If the length
+// of 'data' slice is zero or event cannot be parsed for some other reason, the
+// function will return a special event type: EventNone.
+//
+// IMPORTANT: EventNone may contain a non-zero N, which means you should skip
+// these bytes, because termbox cannot recognize them.
+//
+// NOTE: This API is experimental and may change in future.
+func ParseEvent(data []byte) Event {
+	event := Event{Type: EventKey}
+	status := extract_event(data, &event, false)
+	if status != event_extracted {
+		return Event{Type: EventNone, N: event.N}
+	}
+	return event
+}
+
+// Wait for an event and return it. This is a blocking function call. Instead
+// of EventKey and EventMouse it returns EventRaw events. Raw event is written
+// into `data` slice and Event's N field is set to the amount of bytes written.
+// The minimum required length of the 'data' slice is 1. This requirement may
+// vary on different platforms.
+//
+// NOTE: This API is experimental and may change in future.
+func PollRawEvent(data []byte) Event {
+	if len(data) == 0 {
+		panic("len(data) >= 1 is a requirement")
+	}
+
+	var event Event
+	if extract_raw_event(data, &event) {
+		return event
+	}
+
+	for {
+		select {
+		case ev := <-input_comm:
+			if ev.err != nil {
+				return Event{Type: EventError, Err: ev.err}
+			}
+
+			inbuf = append(inbuf, ev.data...)
+			input_comm <- ev
+			if extract_raw_event(data, &event) {
+				return event
+			}
+		case <-interrupt_comm:
+			event.Type = EventInterrupt
+			return event
+
+		case <-sigwinch:
+			event.Type = EventResize
+			event.Width, event.Height = get_term_size(out.Fd())
+			return event
+		}
+	}
+}
+
+// Wait for an event and return it. This is a blocking function call.
+func PollEvent() Event {
+	// Constant governing macOS specific behavior. See https://github.com/nsf/termbox-go/issues/132
+	// This is an arbitrary delay which hopefully will be enough time for any lagging
+	// partial escape sequences to come through.
+	const esc_wait_delay = 100 * time.Millisecond
+
+	var event Event
+	var esc_wait_timer *time.Timer
+	var esc_timeout <-chan time.Time
+
+	// try to extract event from input buffer, return on success
+	event.Type = EventKey
+	status := extract_event(inbuf, &event, true)
+	if event.N != 0 {
+		if event.N > len(inbuf) {
+			event.N = len(inbuf)
+		}
+		copy(inbuf, inbuf[event.N:])
+		inbuf = inbuf[:len(inbuf)-event.N]
+	}
+	if status == event_extracted {
+		return event
+	} else if status == esc_wait {
+		esc_wait_timer = time.NewTimer(esc_wait_delay)
+		esc_timeout = esc_wait_timer.C
+	}
+
+	for {
+		select {
+		case ev := <-input_comm:
+			if esc_wait_timer != nil {
+				if !esc_wait_timer.Stop() {
+					<-esc_wait_timer.C
+				}
+				esc_wait_timer = nil
+			}
+
+			if ev.err != nil {
+				return Event{Type: EventError, Err: ev.err}
+			}
+
+			inbuf = append(inbuf, ev.data...)
+			input_comm <- ev
+			status := extract_event(inbuf, &event, true)
+			if event.N != 0 {
+				if event.N > len(inbuf) {
+					event.N = len(inbuf)
+				}
+				copy(inbuf, inbuf[event.N:])
+				inbuf = inbuf[:len(inbuf)-event.N]
+			}
+			if status == event_extracted {
+				return event
+			} else if status == esc_wait {
+				esc_wait_timer = time.NewTimer(esc_wait_delay)
+				esc_timeout = esc_wait_timer.C
+			}
+		case <-esc_timeout:
+			esc_wait_timer = nil
+
+			status := extract_event(inbuf, &event, false)
+			if event.N != 0 {
+				if event.N > len(inbuf) {
+					event.N = len(inbuf)
+				}
+				copy(inbuf, inbuf[event.N:])
+				inbuf = inbuf[:len(inbuf)-event.N]
+			}
+			if status == event_extracted {
+				return event
+			}
+		case <-interrupt_comm:
+			event.Type = EventInterrupt
+			return event
+
+		case <-sigwinch:
+			event.Type = EventResize
+			event.Width, event.Height = get_term_size(out.Fd())
+			return event
+		}
+	}
+}
+
+// Returns the size of the internal back buffer (which is mostly the same as
+// terminal's window size in characters). But it doesn't always match the size
+// of the terminal window, after the terminal size has changed, the internal
+// back buffer will get in sync only after Clear or Flush function calls.
+func Size() (width int, height int) {
+	return termw, termh
+}
+
+// Clears the internal back buffer.
+func Clear(fg, bg Attribute) error {
+	foreground, background = fg, bg
+	err := update_size_maybe()
+	back_buffer.clear()
+	return err
+}
+
+// Sets termbox input mode. Termbox has two input modes:
+//
+// 1. Esc input mode. When ESC sequence is in the buffer and it doesn't match
+// any known sequence. ESC means KeyEsc. This is the default input mode.
+//
+// 2. Alt input mode. When ESC sequence is in the buffer and it doesn't match
+// any known sequence. ESC enables ModAlt modifier for the next keyboard event.
+//
+// Both input modes can be OR'ed with Mouse mode. Setting Mouse mode bit up will
+// enable mouse button press/release and drag events.
+//
+// If 'mode' is InputCurrent, returns the current input mode. See also Input*
+// constants.
+func SetInputMode(mode InputMode) InputMode {
+	if mode == InputCurrent {
+		return input_mode
+	}
+	if mode&(InputEsc|InputAlt) == 0 {
+		mode |= InputEsc
+	}
+	if mode&(InputEsc|InputAlt) == InputEsc|InputAlt {
+		mode &^= InputAlt
+	}
+	if mode&InputMouse != 0 {
+		out.WriteString(funcs[t_enter_mouse])
+	} else {
+		out.WriteString(funcs[t_exit_mouse])
+	}
+
+	input_mode = mode
+	return input_mode
+}
+
+// Sets the termbox output mode. Termbox has four output options:
+//
+// 1. OutputNormal => [1..8]
+//    This mode provides 8 different colors:
+//        black, red, green, yellow, blue, magenta, cyan, white
+//    Shortcut: ColorBlack, ColorRed, ...
+//    Attributes: AttrBold, AttrUnderline, AttrReverse
+//
+//    Example usage:
+//        SetCell(x, y, '@', ColorBlack | AttrBold, ColorRed);
+//
+// 2. Output256 => [1..256]
+//    In this mode you can leverage the 256 terminal mode:
+//    0x01 - 0x08: the 8 colors as in OutputNormal
+//    0x09 - 0x10: Color* | AttrBold
+//    0x11 - 0xe8: 216 different colors
+//    0xe9 - 0x1ff: 24 different shades of grey
+//
+//    Example usage:
+//        SetCell(x, y, '@', 184, 240);
+//        SetCell(x, y, '@', 0xb8, 0xf0);
+//
+// 3. Output216 => [1..216]
+//    This mode supports the 3rd range of the 256 mode only.
+//    But you don't need to provide an offset.
+//
+// 4. OutputGrayscale => [1..26]
+//    This mode supports the 4th range of the 256 mode
+//    and black and white colors from 3th range of the 256 mode
+//    But you don't need to provide an offset.
+//
+// In all modes, 0x00 represents the default color.
+//
+// `go run _demos/output.go` to see its impact on your terminal.
+//
+// If 'mode' is OutputCurrent, it returns the current output mode.
+//
+// Note that this may return a different OutputMode than the one requested,
+// as the requested mode may not be available on the target platform.
+func SetOutputMode(mode OutputMode) OutputMode {
+	if mode == OutputCurrent {
+		return output_mode
+	}
+
+	output_mode = mode
+	return output_mode
+}
+
+// Sync comes handy when something causes desync between termbox's understanding
+// of a terminal buffer and the reality. Such as a third party process. Sync
+// forces a complete resync between the termbox and a terminal, it may not be
+// visually pretty though.
+func Sync() error {
+	front_buffer.clear()
+	err := send_clear()
+	if err != nil {
+		return err
+	}
+
+	return Flush()
+}
diff --git a/vendor/github.com/awesome-gocui/termbox-go/api_common.go b/vendor/github.com/awesome-gocui/termbox-go/api_common.go
new file mode 100644
index 00000000..5ca1371a
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/api_common.go
@@ -0,0 +1,187 @@
+// termbox is a library for creating cross-platform text-based interfaces
+package termbox
+
+// public API, common OS agnostic part
+
+type (
+	InputMode  int
+	OutputMode int
+	EventType  uint8
+	Modifier   uint8
+	Key        uint16
+	Attribute  uint16
+)
+
+// This type represents a termbox event. The 'Mod', 'Key' and 'Ch' fields are
+// valid if 'Type' is EventKey. The 'Width' and 'Height' fields are valid if
+// 'Type' is EventResize. The 'Err' field is valid if 'Type' is EventError.
+type Event struct {
+	Type   EventType // one of Event* constants
+	Mod    Modifier  // one of Mod* constants or 0
+	Key    Key       // one of Key* constants, invalid if 'Ch' is not 0
+	Ch     rune      // a unicode character
+	Width  int       // width of the screen
+	Height int       // height of the screen
+	Err    error     // error in case if input failed
+	MouseX int       // x coord of mouse
+	MouseY int       // y coord of mouse
+	N      int       // number of bytes written when getting a raw event
+}
+
+// A cell, single conceptual entity on the screen. The screen is basically a 2d
+// array of cells. 'Ch' is a unicode character, 'Fg' and 'Bg' are foreground
+// and background attributes respectively.
+type Cell struct {
+	Ch rune
+	Fg Attribute
+	Bg Attribute
+}
+
+// To know if termbox has been initialized or not
+var (
+	IsInit bool = false
+)
+
+// Key constants, see Event.Key field.
+const (
+	KeyF1 Key = 0xFFFF - iota
+	KeyF2
+	KeyF3
+	KeyF4
+	KeyF5
+	KeyF6
+	KeyF7
+	KeyF8
+	KeyF9
+	KeyF10
+	KeyF11
+	KeyF12
+	KeyInsert
+	KeyDelete
+	KeyHome
+	KeyEnd
+	KeyPgup
+	KeyPgdn
+	KeyArrowUp
+	KeyArrowDown
+	KeyArrowLeft
+	KeyArrowRight
+	key_min // see terminfo
+	MouseLeft
+	MouseMiddle
+	MouseRight
+	MouseRelease
+	MouseWheelUp
+	MouseWheelDown
+)
+
+const (
+	KeyCtrlTilde      Key = 0x00
+	KeyCtrl2          Key = 0x00
+	KeyCtrlSpace      Key = 0x00
+	KeyCtrlA          Key = 0x01
+	KeyCtrlB          Key = 0x02
+	KeyCtrlC          Key = 0x03
+	KeyCtrlD          Key = 0x04
+	KeyCtrlE          Key = 0x05
+	KeyCtrlF          Key = 0x06
+	KeyCtrlG          Key = 0x07
+	KeyBackspace      Key = 0x08
+	KeyCtrlH          Key = 0x08
+	KeyTab            Key = 0x09
+	KeyCtrlI          Key = 0x09
+	KeyCtrlJ          Key = 0x0A
+	KeyCtrlK          Key = 0x0B
+	KeyCtrlL          Key = 0x0C
+	KeyEnter          Key = 0x0D
+	KeyCtrlM          Key = 0x0D
+	KeyCtrlN          Key = 0x0E
+	KeyCtrlO          Key = 0x0F
+	KeyCtrlP          Key = 0x10
+	KeyCtrlQ          Key = 0x11
+	KeyCtrlR          Key = 0x12
+	KeyCtrlS          Key = 0x13
+	KeyCtrlT          Key = 0x14
+	KeyCtrlU          Key = 0x15
+	KeyCtrlV          Key = 0x16
+	KeyCtrlW          Key = 0x17
+	KeyCtrlX          Key = 0x18
+	KeyCtrlY          Key = 0x19
+	KeyCtrlZ          Key = 0x1A
+	KeyEsc            Key = 0x1B
+	KeyCtrlLsqBracket Key = 0x1B
+	KeyCtrl3          Key = 0x1B
+	KeyCtrl4          Key = 0x1C
+	KeyCtrlBackslash  Key = 0x1C
+	KeyCtrl5          Key = 0x1D
+	KeyCtrlRsqBracket Key = 0x1D
+	KeyCtrl6          Key = 0x1E
+	KeyCtrl7          Key = 0x1F
+	KeyCtrlSlash      Key = 0x1F
+	KeyCtrlUnderscore Key = 0x1F
+	KeySpace          Key = 0x20
+	KeyBackspace2     Key = 0x7F
+	KeyCtrl8          Key = 0x7F
+)
+
+// Alt modifier constant, see Event.Mod field and SetInputMode function.
+const (
+	ModAlt Modifier = 1 << iota
+	ModMotion
+)
+
+// Cell colors, you can combine a color with multiple attributes using bitwise
+// OR ('|').
+const (
+	ColorDefault Attribute = iota
+	ColorBlack
+	ColorRed
+	ColorGreen
+	ColorYellow
+	ColorBlue
+	ColorMagenta
+	ColorCyan
+	ColorWhite
+)
+
+// Cell attributes, it is possible to use multiple attributes by combining them
+// using bitwise OR ('|'). Although, colors cannot be combined. But you can
+// combine attributes and a single color.
+//
+// It's worth mentioning that some platforms don't support certain attributes.
+// For example windows console doesn't support AttrUnderline. And on some
+// terminals applying AttrBold to background may result in blinking text. Use
+// them with caution and test your code on various terminals.
+const (
+	AttrBold Attribute = 1 << (iota + 9)
+	AttrUnderline
+	AttrReverse
+)
+
+// Input mode. See SetInputMode function.
+const (
+	InputEsc InputMode = 1 << iota
+	InputAlt
+	InputMouse
+	InputCurrent InputMode = 0
+)
+
+// Output mode. See SetOutputMode function.
+const (
+	OutputCurrent OutputMode = iota
+	OutputNormal
+	Output256
+	Output216
+	OutputGrayscale
+)
+
+// Event type. See Event.Type field.
+const (
+	EventKey EventType = iota
+	EventResize
+	EventMouse
+	EventError
+	EventInterrupt
+	EventRaw
+	EventNone
+)
diff --git a/vendor/github.com/awesome-gocui/termbox-go/api_windows.go b/vendor/github.com/awesome-gocui/termbox-go/api_windows.go
new file mode 100644
index 00000000..5c1e388a
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/api_windows.go
@@ -0,0 +1,245 @@
+package termbox
+
+import (
+	"syscall"
+)
+
+// public API
+
+// Initializes termbox library. This function should be called before any other functions.
+// After successful initialization, the library must be finalized using 'Close' function.
+//
+// Example usage:
+//      err := termbox.Init()
+//      if err != nil {
+//              panic(err)
+//      }
+//      defer termbox.Close()
+func Init() error {
+	var err error
+
+	interrupt, err = create_event()
+	if err != nil {
+		return err
+	}
+
+	in, err = syscall.Open("CONIN$", syscall.O_RDWR, 0)
+	if err != nil {
+		return err
+	}
+	out, err = syscall.Open("CONOUT$", syscall.O_RDWR, 0)
+	if err != nil {
+		return err
+	}
+
+	err = get_console_mode(in, &orig_mode)
+	if err != nil {
+		return err
+	}
+
+	err = set_console_mode(in, enable_window_input)
+	if err != nil {
+		return err
+	}
+
+	orig_size, orig_window = get_term_size(out)
+	win_size := get_win_size(out)
+
+	err = set_console_screen_buffer_size(out, win_size)
+	if err != nil {
+		return err
+	}
+
+	err = fix_win_size(out, win_size)
+	if err != nil {
+		return err
+	}
+
+	err = get_console_cursor_info(out, &orig_cursor_info)
+	if err != nil {
+		return err
+	}
+
+	show_cursor(false)
+	term_size, _ = get_term_size(out)
+	back_buffer.init(int(term_size.x), int(term_size.y))
+	front_buffer.init(int(term_size.x), int(term_size.y))
+	back_buffer.clear()
+	front_buffer.clear()
+	clear()
+
+	diffbuf = make([]diff_msg, 0, 32)
+
+	go input_event_producer()
+	IsInit = true
+	return nil
+}
+
+// Finalizes termbox library, should be called after successful initialization
+// when termbox's functionality isn't required anymore.
+func Close() {
+	// we ignore errors here, because we can't really do anything about them
+	Clear(0, 0)
+	Flush()
+
+	// stop event producer
+	cancel_comm <- true
+	set_event(interrupt)
+	select {
+	case <-input_comm:
+	default:
+	}
+	<-cancel_done_comm
+
+	set_console_screen_buffer_size(out, orig_size)
+	set_console_window_info(out, &orig_window)
+	set_console_cursor_info(out, &orig_cursor_info)
+	set_console_cursor_position(out, coord{})
+	set_console_mode(in, orig_mode)
+	syscall.Close(in)
+	syscall.Close(out)
+	syscall.Close(interrupt)
+	IsInit = false
+}
+
+// Interrupt an in-progress call to PollEvent by causing it to return
+// EventInterrupt.  Note that this function will block until the PollEvent
+// function has successfully been interrupted.
+func Interrupt() {
+	interrupt_comm <- struct{}{}
+}
+
+// Synchronizes the internal back buffer with the terminal.
+func Flush() error {
+	update_size_maybe()
+	prepare_diff_messages()
+	for _, diff := range diffbuf {
+		r := small_rect{
+			left:   0,
+			top:    diff.pos,
+			right:  term_size.x - 1,
+			bottom: diff.pos + diff.lines - 1,
+		}
+		write_console_output(out, diff.chars, r)
+	}
+	if !is_cursor_hidden(cursor_x, cursor_y) {
+		move_cursor(cursor_x, cursor_y)
+	}
+	return nil
+}
+
+// Sets the position of the cursor. See also HideCursor().
+func SetCursor(x, y int) {
+	if is_cursor_hidden(cursor_x, cursor_y) && !is_cursor_hidden(x, y) {
+		show_cursor(true)
+	}
+
+	if !is_cursor_hidden(cursor_x, cursor_y) && is_cursor_hidden(x, y) {
+		show_cursor(false)
+	}
+
+	cursor_x, cursor_y = x, y
+	if !is_cursor_hidden(cursor_x, cursor_y) {
+		move_cursor(cursor_x, cursor_y)
+	}
+}
+
+// The shortcut for SetCursor(-1, -1).
+func HideCursor() {
+	SetCursor(cursor_hidden, cursor_hidden)
+}
+
+// Changes cell's parameters in the internal back buffer at the specified
+// position.
+func SetCell(x, y int, ch rune, fg, bg Attribute) {
+	if x < 0 || x >= back_buffer.width {
+		return
+	}
+	if y < 0 || y >= back_buffer.height {
+		return
+	}
+
+	back_buffer.cells[y*back_buffer.width+x] = Cell{ch, fg, bg}
+}
+
+// Returns a slice into the termbox's back buffer. You can get its dimensions
+// using 'Size' function. The slice remains valid as long as no 'Clear' or
+// 'Flush' function calls were made after call to this function.
+func CellBuffer() []Cell {
+	return back_buffer.cells
+}
+
+// Wait for an event and return it. This is a blocking function call.
+func PollEvent() Event {
+	select {
+	case ev := <-input_comm:
+		return ev
+	case <-interrupt_comm:
+		return Event{Type: EventInterrupt}
+	}
+}
+
+// Returns the size of the internal back buffer (which is mostly the same as
+// console's window size in characters). But it doesn't always match the size
+// of the console window, after the console size has changed, the internal back
+// buffer will get in sync only after Clear or Flush function calls.
+func Size() (int, int) {
+	return int(term_size.x), int(term_size.y)
+}
+
+// Clears the internal back buffer.
+func Clear(fg, bg Attribute) error {
+	foreground, background = fg, bg
+	update_size_maybe()
+	back_buffer.clear()
+	return nil
+}
+
+// Sets termbox input mode. Termbox has two input modes:
+//
+// 1. Esc input mode. When ESC sequence is in the buffer and it doesn't match
+// any known sequence. ESC means KeyEsc. This is the default input mode.
+//
+// 2. Alt input mode. When ESC sequence is in the buffer and it doesn't match
+// any known sequence. ESC enables ModAlt modifier for the next keyboard event.
+//
+// Both input modes can be OR'ed with Mouse mode. Setting Mouse mode bit up will
+// enable mouse button press/release and drag events.
+//
+// If 'mode' is InputCurrent, returns the current input mode. See also Input*
+// constants.
+func SetInputMode(mode InputMode) InputMode {
+	if mode == InputCurrent {
+		return input_mode
+	}
+	if mode&InputMouse != 0 {
+		err := set_console_mode(in, enable_window_input|enable_mouse_input|enable_extended_flags)
+		if err != nil {
+			panic(err)
+		}
+	} else {
+		err := set_console_mode(in, enable_window_input)
+		if err != nil {
+			panic(err)
+		}
+	}
+
+	input_mode = mode
+	return input_mode
+}
+
+// Sets the termbox output mode.
+//
+// Windows console does not support extra colour modes,
+// so this will always set and return OutputNormal.
+func SetOutputMode(mode OutputMode) OutputMode {
+	return OutputNormal
+}
+
+// Sync comes handy when something causes desync between termbox's understanding
+// of a terminal buffer and the reality. Such as a third party process. Sync
+// forces a complete resync between the termbox and a terminal, it may not be
+// visually pretty though. At the moment on Windows it does nothing.
+func Sync() error {
+	return nil
+}
diff --git a/vendor/github.com/awesome-gocui/termbox-go/collect_terminfo.py b/vendor/github.com/awesome-gocui/termbox-go/collect_terminfo.py
new file mode 100755
index 00000000..5e50975e
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/collect_terminfo.py
@@ -0,0 +1,110 @@
+#!/usr/bin/env python
+
+import sys, os, subprocess
+
+def escaped(s):
+	return repr(s)[1:-1]
+
+def tput(term, name):
+	try:
+		return subprocess.check_output(['tput', '-T%s' % term, name]).decode()
+	except subprocess.CalledProcessError as e:
+		return e.output.decode()
+
+
+def w(s):
+	if s == None:
+		return
+	sys.stdout.write(s)
+
+terminals = {
+	'xterm' : 'xterm',
+	'rxvt-256color' : 'rxvt_256color',
+	'rxvt-unicode' : 'rxvt_unicode',
+	'linux' : 'linux',
+	'Eterm' : 'eterm',
+	'screen' : 'screen'
+}
+
+keys = [
+	"F1",		"kf1",
+	"F2",		"kf2",
+	"F3",		"kf3",
+	"F4",		"kf4",
+	"F5",		"kf5",
+	"F6",		"kf6",
+	"F7",		"kf7",
+	"F8",		"kf8",
+	"F9",		"kf9",
+	"F10",		"kf10",
+	"F11",		"kf11",
+	"F12",		"kf12",
+	"INSERT",	"kich1",
+	"DELETE",	"kdch1",
+	"HOME",		"khome",
+	"END",		"kend",
+	"PGUP",		"kpp",
+	"PGDN",		"knp",
+	"KEY_UP",	"kcuu1",
+	"KEY_DOWN",	"kcud1",
+	"KEY_LEFT",	"kcub1",
+	"KEY_RIGHT",	"kcuf1"
+]
+
+funcs = [
+	"T_ENTER_CA",		"smcup",
+	"T_EXIT_CA",		"rmcup",
+	"T_SHOW_CURSOR",	"cnorm",
+	"T_HIDE_CURSOR",	"civis",
+	"T_CLEAR_SCREEN",	"clear",
+	"T_SGR0",		"sgr0",
+	"T_UNDERLINE",		"smul",
+	"T_BOLD",		"bold",
+	"T_BLINK",		"blink",
+	"T_REVERSE",            "rev",
+	"T_ENTER_KEYPAD",	"smkx",
+	"T_EXIT_KEYPAD",	"rmkx"
+]
+
+def iter_pairs(iterable):
+	iterable = iter(iterable)
+	while True:
+		yield (next(iterable), next(iterable))
+
+def do_term(term, nick):
+	w("// %s\n" % term)
+	w("var %s_keys = []string{\n\t" % nick)
+	for k, v in iter_pairs(keys):
+		w('"')
+		w(escaped(tput(term, v)))
+		w('",')
+	w("\n}\n")
+	w("var %s_funcs = []string{\n\t" % nick)
+	for k,v in iter_pairs(funcs):
+		w('"')
+		if v == "sgr":
+			w("\\033[3%d;4%dm")
+		elif v == "cup":
+			w("\\033[%d;%dH")
+		else:
+			w(escaped(tput(term, v)))
+		w('", ')
+	w("\n}\n\n")
+
+def do_terms(d):
+	w("var terms = []struct {\n")
+	w("\tname  string\n")
+	w("\tkeys  []string\n")
+	w("\tfuncs []string\n")
+	w("}{\n")
+	for k, v in d.items():
+		w('\t{"%s", %s_keys, %s_funcs},\n' % (k, v, v))
+	w("}\n\n")
+
+w("// +build !windows\n\npackage termbox\n\n")
+
+for k,v in terminals.items():
+	do_term(k, v)
+
+do_terms(terminals)
+
diff --git a/vendor/github.com/awesome-gocui/termbox-go/escwait.go b/vendor/github.com/awesome-gocui/termbox-go/escwait.go
new file mode 100644
index 00000000..b7bbb891
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/escwait.go
@@ -0,0 +1,11 @@
+// +build !darwin
+
+package termbox
+
+// On all systems other than macOS, disable behavior which will wait before
+// deciding that the escape key was pressed, to account for partially send
+// escape sequences, especially with regard to lengthy mouse sequences.
+// See https://github.com/nsf/termbox-go/issues/132
+func enable_wait_for_escape_sequence() bool {
+	return false
+}
diff --git a/vendor/github.com/awesome-gocui/termbox-go/escwait_darwin.go b/vendor/github.com/awesome-gocui/termbox-go/escwait_darwin.go
new file mode 100644
index 00000000..dde69b6c
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/escwait_darwin.go
@@ -0,0 +1,9 @@
+package termbox
+
+// On macOS, enable behavior which will wait before deciding that the escape
+// key was pressed, to account for partially send escape sequences, especially
+// with regard to lengthy mouse sequences.
+// See https://github.com/nsf/termbox-go/issues/132
+func enable_wait_for_escape_sequence() bool {
+	return true
+}
diff --git a/vendor/github.com/awesome-gocui/termbox-go/syscalls.go b/vendor/github.com/awesome-gocui/termbox-go/syscalls.go
new file mode 100644
index 00000000..4f52bb9a
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/syscalls.go
@@ -0,0 +1,39 @@
+// +build ignore
+
+package termbox
+
+/*
+#include <termios.h>
+#include <sys/ioctl.h>
+*/
+import "C"
+
+type syscall_Termios C.struct_termios
+
+const (
+	syscall_IGNBRK = C.IGNBRK
+	syscall_BRKINT = C.BRKINT
+	syscall_PARMRK = C.PARMRK
+	syscall_ISTRIP = C.ISTRIP
+	syscall_INLCR  = C.INLCR
+	syscall_IGNCR  = C.IGNCR
+	syscall_ICRNL  = C.ICRNL
+	syscall_IXON   = C.IXON
+	syscall_OPOST  = C.OPOST
+	syscall_ECHO   = C.ECHO
+	syscall_ECHONL = C.ECHONL
+	syscall_ICANON = C.ICANON
+	syscall_ISIG   = C.ISIG
+	syscall_IEXTEN = C.IEXTEN
+	syscall_CSIZE  = C.CSIZE
+	syscall_PARENB = C.PARENB
+	syscall_CS8    = C.CS8
+	syscall_VMIN   = C.VMIN
+	syscall_VTIME  = C.VTIME
+
+	// on darwin change these to (on *bsd too?):
+	// C.TIOCGETA
+	// C.TIOCSETA
+	syscall_TCGETS = C.TCGETS
+	syscall_TCSETS = C.TCSETS
+)
diff --git a/vendor/github.com/awesome-gocui/termbox-go/syscalls_darwin.go b/vendor/github.com/awesome-gocui/termbox-go/syscalls_darwin.go
new file mode 100644
index 00000000..25b78f7a
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/syscalls_darwin.go
@@ -0,0 +1,41 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs syscalls.go
+
+// +build !amd64
+
+package termbox
+
+type syscall_Termios struct {
+	Iflag  uint32
+	Oflag  uint32
+	Cflag  uint32
+	Lflag  uint32
+	Cc     [20]uint8
+	Ispeed uint32
+	Ospeed uint32
+}
+
+const (
+	syscall_IGNBRK = 0x1
+	syscall_BRKINT = 0x2
+	syscall_PARMRK = 0x8
+	syscall_ISTRIP = 0x20
+	syscall_INLCR  = 0x40
+	syscall_IGNCR  = 0x80
+	syscall_ICRNL  = 0x100
+	syscall_IXON   = 0x200
+	syscall_OPOST  = 0x1
+	syscall_ECHO   = 0x8
+	syscall_ECHONL = 0x10
+	syscall_ICANON = 0x100
+	syscall_ISIG   = 0x80
+	syscall_IEXTEN = 0x400
+	syscall_CSIZE  = 0x300
+	syscall_PARENB = 0x1000
+	syscall_CS8    = 0x300
+	syscall_VMIN   = 0x10
+	syscall_VTIME  = 0x11
+
+	syscall_TCGETS = 0x402c7413
+	syscall_TCSETS = 0x802c7414
+)
diff --git a/vendor/github.com/awesome-gocui/termbox-go/syscalls_darwin_amd64.go b/vendor/github.com/awesome-gocui/termbox-go/syscalls_darwin_amd64.go
new file mode 100644
index 00000000..11f25be7
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/syscalls_darwin_amd64.go
@@ -0,0 +1,40 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs syscalls.go
+
+package termbox
+
+type syscall_Termios struct {
+	Iflag     uint64
+	Oflag     uint64
+	Cflag     uint64
+	Lflag     uint64
+	Cc        [20]uint8
+	Pad_cgo_0 [4]byte
+	Ispeed    uint64
+	Ospeed    uint64
+}
+
+const (
+	syscall_IGNBRK = 0x1
+	syscall_BRKINT = 0x2
+	syscall_PARMRK = 0x8
+	syscall_ISTRIP = 0x20
+	syscall_INLCR  = 0x40
+	syscall_IGNCR  = 0x80
+	syscall_ICRNL  = 0x100
+	syscall_IXON   = 0x200
+	syscall_OPOST  = 0x1
+	syscall_ECHO   = 0x8
+	syscall_ECHONL = 0x10
+	syscall_ICANON = 0x100
+	syscall_ISIG   = 0x80
+	syscall_IEXTEN = 0x400
+	syscall_CSIZE  = 0x300
+	syscall_PARENB = 0x1000
+	syscall_CS8    = 0x300
+	syscall_VMIN   = 0x10
+	syscall_VTIME  = 0x11
+
+	syscall_TCGETS = 0x40487413
+	syscall_TCSETS = 0x80487414
+)
diff --git a/vendor/github.com/awesome-gocui/termbox-go/syscalls_dragonfly.go b/vendor/github.com/awesome-gocui/termbox-go/syscalls_dragonfly.go
new file mode 100644
index 00000000..e03624eb
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/syscalls_dragonfly.go
@@ -0,0 +1,39 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs syscalls.go
+
+package termbox
+
+type syscall_Termios struct {
+	Iflag  uint32
+	Oflag  uint32
+	Cflag  uint32
+	Lflag  uint32
+	Cc     [20]uint8
+	Ispeed uint32
+	Ospeed uint32
+}
+
+const (
+	syscall_IGNBRK = 0x1
+	syscall_BRKINT = 0x2
+	syscall_PARMRK = 0x8
+	syscall_ISTRIP = 0x20
+	syscall_INLCR  = 0x40
+	syscall_IGNCR  = 0x80
+	syscall_ICRNL  = 0x100
+	syscall_IXON   = 0x200
+	syscall_OPOST  = 0x1
+	syscall_ECHO   = 0x8
+	syscall_ECHONL = 0x10
+	syscall_ICANON = 0x100
+	syscall_ISIG   = 0x80
+	syscall_IEXTEN = 0x400
+	syscall_CSIZE  = 0x300
+	syscall_PARENB = 0x1000
+	syscall_CS8    = 0x300
+	syscall_VMIN   = 0x10
+	syscall_VTIME  = 0x11
+
+	syscall_TCGETS = 0x402c7413
+	syscall_TCSETS = 0x802c7414
+)
diff --git a/vendor/github.com/awesome-gocui/termbox-go/syscalls_freebsd.go b/vendor/github.com/awesome-gocui/termbox-go/syscalls_freebsd.go
new file mode 100644
index 00000000..e03624eb
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/syscalls_freebsd.go
@@ -0,0 +1,39 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs syscalls.go
+
+package termbox
+
+type syscall_Termios struct {
+	Iflag  uint32
+	Oflag  uint32
+	Cflag  uint32
+	Lflag  uint32
+	Cc     [20]uint8
+	Ispeed uint32
+	Ospeed uint32
+}
+
+const (
+	syscall_IGNBRK = 0x1
+	syscall_BRKINT = 0x2
+	syscall_PARMRK = 0x8
+	syscall_ISTRIP = 0x20
+	syscall_INLCR  = 0x40
+	syscall_IGNCR  = 0x80
+	syscall_ICRNL  = 0x100
+	syscall_IXON   = 0x200
+	syscall_OPOST  = 0x1
+	syscall_ECHO   = 0x8
+	syscall_ECHONL = 0x10
+	syscall_ICANON = 0x100
+	syscall_ISIG   = 0x80
+	syscall_IEXTEN = 0x400
+	syscall_CSIZE  = 0x300
+	syscall_PARENB = 0x1000
+	syscall_CS8    = 0x300
+	syscall_VMIN   = 0x10
+	syscall_VTIME  = 0x11
+
+	syscall_TCGETS = 0x402c7413
+	syscall_TCSETS = 0x802c7414
+)
diff --git a/vendor/github.com/awesome-gocui/termbox-go/syscalls_linux.go b/vendor/github.com/awesome-gocui/termbox-go/syscalls_linux.go
new file mode 100644
index 00000000..b88960de
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/syscalls_linux.go
@@ -0,0 +1,33 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs syscalls.go
+
+package termbox
+
+import "syscall"
+
+type syscall_Termios syscall.Termios
+
+const (
+	syscall_IGNBRK = syscall.IGNBRK
+	syscall_BRKINT = syscall.BRKINT
+	syscall_PARMRK = syscall.PARMRK
+	syscall_ISTRIP = syscall.ISTRIP
+	syscall_INLCR  = syscall.INLCR
+	syscall_IGNCR  = syscall.IGNCR
+	syscall_ICRNL  = syscall.ICRNL
+	syscall_IXON   = syscall.IXON
+	syscall_OPOST  = syscall.OPOST
+	syscall_ECHO   = syscall.ECHO
+	syscall_ECHONL = syscall.ECHONL
+	syscall_ICANON = syscall.ICANON
+	syscall_ISIG   = syscall.ISIG
+	syscall_IEXTEN = syscall.IEXTEN
+	syscall_CSIZE  = syscall.CSIZE
+	syscall_PARENB = syscall.PARENB
+	syscall_CS8    = syscall.CS8
+	syscall_VMIN   = syscall.VMIN
+	syscall_VTIME  = syscall.VTIME
+
+	syscall_TCGETS = syscall.TCGETS
+	syscall_TCSETS = syscall.TCSETS
+)
diff --git a/vendor/github.com/awesome-gocui/termbox-go/syscalls_netbsd.go b/vendor/github.com/awesome-gocui/termbox-go/syscalls_netbsd.go
new file mode 100644
index 00000000..49a3355b
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/syscalls_netbsd.go
@@ -0,0 +1,39 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs syscalls.go
+
+package termbox
+
+type syscall_Termios struct {
+	Iflag  uint32
+	Oflag  uint32
+	Cflag  uint32
+	Lflag  uint32
+	Cc     [20]uint8
+	Ispeed int32
+	Ospeed int32
+}
+
+const (
+	syscall_IGNBRK = 0x1
+	syscall_BRKINT = 0x2
+	syscall_PARMRK = 0x8
+	syscall_ISTRIP = 0x20
+	syscall_INLCR  = 0x40
+	syscall_IGNCR  = 0x80
+	syscall_ICRNL  = 0x100
+	syscall_IXON   = 0x200
+	syscall_OPOST  = 0x1
+	syscall_ECHO   = 0x8
+	syscall_ECHONL = 0x10
+	syscall_ICANON = 0x100
+	syscall_ISIG   = 0x80
+	syscall_IEXTEN = 0x400
+	syscall_CSIZE  = 0x300
+	syscall_PARENB = 0x1000
+	syscall_CS8    = 0x300
+	syscall_VMIN   = 0x10
+	syscall_VTIME  = 0x11
+
+	syscall_TCGETS = 0x402c7413
+	syscall_TCSETS = 0x802c7414
+)
diff --git a/vendor/github.com/awesome-gocui/termbox-go/syscalls_openbsd.go b/vendor/github.com/awesome-gocui/termbox-go/syscalls_openbsd.go
new file mode 100644
index 00000000..49a3355b
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/syscalls_openbsd.go
@@ -0,0 +1,39 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs syscalls.go
+
+package termbox
+
+type syscall_Termios struct {
+	Iflag  uint32
+	Oflag  uint32
+	Cflag  uint32
+	Lflag  uint32
+	Cc     [20]uint8
+	Ispeed int32
+	Ospeed int32
+}
+
+const (
+	syscall_IGNBRK = 0x1
+	syscall_BRKINT = 0x2
+	syscall_PARMRK = 0x8
+	syscall_ISTRIP = 0x20
+	syscall_INLCR  = 0x40
+	syscall_IGNCR  = 0x80
+	syscall_ICRNL  = 0x100
+	syscall_IXON   = 0x200
+	syscall_OPOST  = 0x1
+	syscall_ECHO   = 0x8
+	syscall_ECHONL = 0x10
+	syscall_ICANON = 0x100
+	syscall_ISIG   = 0x80
+	syscall_IEXTEN = 0x400
+	syscall_CSIZE  = 0x300
+	syscall_PARENB = 0x1000
+	syscall_CS8    = 0x300
+	syscall_VMIN   = 0x10
+	syscall_VTIME  = 0x11
+
+	syscall_TCGETS = 0x402c7413
+	syscall_TCSETS = 0x802c7414
+)
diff --git a/vendor/github.com/awesome-gocui/termbox-go/syscalls_windows.go b/vendor/github.com/awesome-gocui/termbox-go/syscalls_windows.go
new file mode 100644
index 00000000..472d002a
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/syscalls_windows.go
@@ -0,0 +1,61 @@
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs -- -DUNICODE syscalls.go
+
+package termbox
+
+const (
+	foreground_blue          = 0x1
+	foreground_green         = 0x2
+	foreground_red           = 0x4
+	foreground_intensity     = 0x8
+	background_blue          = 0x10
+	background_green         = 0x20
+	background_red           = 0x40
+	background_intensity     = 0x80
+	std_input_handle         = -0xa
+	std_output_handle        = -0xb
+	key_event                = 0x1
+	mouse_event              = 0x2
+	window_buffer_size_event = 0x4
+	enable_window_input      = 0x8
+	enable_mouse_input       = 0x10
+	enable_extended_flags    = 0x80
+
+	vk_f1          = 0x70
+	vk_f2          = 0x71
+	vk_f3          = 0x72
+	vk_f4          = 0x73
+	vk_f5          = 0x74
+	vk_f6          = 0x75
+	vk_f7          = 0x76
+	vk_f8          = 0x77
+	vk_f9          = 0x78
+	vk_f10         = 0x79
+	vk_f11         = 0x7a
+	vk_f12         = 0x7b
+	vk_insert      = 0x2d
+	vk_delete      = 0x2e
+	vk_home        = 0x24
+	vk_end         = 0x23
+	vk_pgup        = 0x21
+	vk_pgdn        = 0x22
+	vk_arrow_up    = 0x26
+	vk_arrow_down  = 0x28
+	vk_arrow_left  = 0x25
+	vk_arrow_right = 0x27
+	vk_backspace   = 0x8
+	vk_tab         = 0x9
+	vk_enter       = 0xd
+	vk_esc         = 0x1b
+	vk_space       = 0x20
+
+	left_alt_pressed   = 0x2
+	left_ctrl_pressed  = 0x8
+	right_alt_pressed  = 0x1
+	right_ctrl_pressed = 0x4
+	shift_pressed      = 0x10
+
+	generic_read            = 0x80000000
+	generic_write           = 0x40000000
+	console_textmode_buffer = 0x1
+)
diff --git a/vendor/github.com/awesome-gocui/termbox-go/termbox.go b/vendor/github.com/awesome-gocui/termbox-go/termbox.go
new file mode 100644
index 00000000..fbe4c3de
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/termbox.go
@@ -0,0 +1,529 @@
+// +build !windows
+
+package termbox
+
+import "unicode/utf8"
+import "bytes"
+import "syscall"
+import "unsafe"
+import "strings"
+import "strconv"
+import "os"
+import "io"
+
+// private API
+
+const (
+	t_enter_ca = iota
+	t_exit_ca
+	t_show_cursor
+	t_hide_cursor
+	t_clear_screen
+	t_sgr0
+	t_underline
+	t_bold
+	t_blink
+	t_reverse
+	t_enter_keypad
+	t_exit_keypad
+	t_enter_mouse
+	t_exit_mouse
+	t_max_funcs
+)
+
+const (
+	coord_invalid = -2
+	attr_invalid  = Attribute(0xFFFF)
+)
+
+type input_event struct {
+	data []byte
+	err  error
+}
+
+type extract_event_res int
+
+const (
+	event_not_extracted extract_event_res = iota
+	event_extracted
+	esc_wait
+)
+
+var (
+	// term specific sequences
+	keys  []string
+	funcs []string
+
+	// termbox inner state
+	orig_tios      syscall_Termios
+	back_buffer    cellbuf
+	front_buffer   cellbuf
+	termw          int
+	termh          int
+	input_mode     = InputEsc
+	output_mode    = OutputNormal
+	out            *os.File
+	in             int
+	lastfg         = attr_invalid
+	lastbg         = attr_invalid
+	lastx          = coord_invalid
+	lasty          = coord_invalid
+	cursor_x       = cursor_hidden
+	cursor_y       = cursor_hidden
+	foreground     = ColorDefault
+	background     = ColorDefault
+	inbuf          = make([]byte, 0, 64)
+	outbuf         bytes.Buffer
+	sigwinch       = make(chan os.Signal, 1)
+	sigio          = make(chan os.Signal, 1)
+	quit           = make(chan int)
+	input_comm     = make(chan input_event)
+	interrupt_comm = make(chan struct{})
+	intbuf         = make([]byte, 0, 16)
+
+	// grayscale indexes
+	grayscale = []Attribute{
+		0, 17, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244,
+		245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 232,
+	}
+)
+
+func write_cursor(x, y int) {
+	outbuf.WriteString("\033[")
+	outbuf.Write(strconv.AppendUint(intbuf, uint64(y+1), 10))
+	outbuf.WriteString(";")
+	outbuf.Write(strconv.AppendUint(intbuf, uint64(x+1), 10))
+	outbuf.WriteString("H")
+}
+
+func write_sgr_fg(a Attribute) {
+	switch output_mode {
+	case Output256, Output216, OutputGrayscale:
+		outbuf.WriteString("\033[38;5;")
+		outbuf.Write(strconv.AppendUint(intbuf, uint64(a-1), 10))
+		outbuf.WriteString("m")
+	default:
+		outbuf.WriteString("\033[3")
+		outbuf.Write(strconv.AppendUint(intbuf, uint64(a-1), 10))
+		outbuf.WriteString("m")
+	}
+}
+
+func write_sgr_bg(a Attribute) {
+	switch output_mode {
+	case Output256, Output216, OutputGrayscale:
+		outbuf.WriteString("\033[48;5;")
+		outbuf.Write(strconv.AppendUint(intbuf, uint64(a-1), 10))
+		outbuf.WriteString("m")
+	default:
+		outbuf.WriteString("\033[4")
+		outbuf.Write(strconv.AppendUint(intbuf, uint64(a-1), 10))
+		outbuf.WriteString("m")
+	}
+}
+
+func write_sgr(fg, bg Attribute) {
+	switch output_mode {
+	case Output256, Output216, OutputGrayscale:
+		outbuf.WriteString("\033[38;5;")
+		outbuf.Write(strconv.AppendUint(intbuf, uint64(fg-1), 10))
+		outbuf.WriteString("m")
+		outbuf.WriteString("\033[48;5;")
+		outbuf.Write(strconv.AppendUint(intbuf, uint64(bg-1), 10))
+		outbuf.WriteString("m")
+	default:
+		outbuf.WriteString("\033[3")
+		outbuf.Write(strconv.AppendUint(intbuf, uint64(fg-1), 10))
+		outbuf.WriteString(";4")
+		outbuf.Write(strconv.AppendUint(intbuf, uint64(bg-1), 10))
+		outbuf.WriteString("m")
+	}
+}
+
+type winsize struct {
+	rows    uint16
+	cols    uint16
+	xpixels uint16
+	ypixels uint16
+}
+
+func get_term_size(fd uintptr) (int, int) {
+	var sz winsize
+	_, _, _ = syscall.Syscall(syscall.SYS_IOCTL,
+		fd, uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(&sz)))
+	return int(sz.cols), int(sz.rows)
+}
+
+func send_attr(fg, bg Attribute) {
+	if fg == lastfg && bg == lastbg {
+		return
+	}
+
+	outbuf.WriteString(funcs[t_sgr0])
+
+	var fgcol, bgcol Attribute
+
+	switch output_mode {
+	case Output256:
+		fgcol = fg & 0x1FF
+		bgcol = bg & 0x1FF
+	case Output216:
+		fgcol = fg & 0xFF
+		bgcol = bg & 0xFF
+		if fgcol > 216 {
+			fgcol = ColorDefault
+		}
+		if bgcol > 216 {
+			bgcol = ColorDefault
+		}
+		if fgcol != ColorDefault {
+			fgcol += 0x10
+		}
+		if bgcol != ColorDefault {
+			bgcol += 0x10
+		}
+	case OutputGrayscale:
+		fgcol = fg & 0x1F
+		bgcol = bg & 0x1F
+		if fgcol > 26 {
+			fgcol = ColorDefault
+		}
+		if bgcol > 26 {
+			bgcol = ColorDefault
+		}
+		if fgcol != ColorDefault {
+			fgcol = grayscale[fgcol]
+		}
+		if bgcol != ColorDefault {
+			bgcol = grayscale[bgcol]
+		}
+	default:
+		fgcol = fg & 0x0F
+		bgcol = bg & 0x0F
+	}
+
+	if fgcol != ColorDefault {
+		if bgcol != ColorDefault {
+			write_sgr(fgcol, bgcol)
+		} else {
+			write_sgr_fg(fgcol)
+		}
+	} else if bgcol != ColorDefault {
+		write_sgr_bg(bgcol)
+	}
+
+	if fg&AttrBold != 0 {
+		outbuf.WriteString(funcs[t_bold])
+	}
+	if bg&AttrBold != 0 {
+		outbuf.WriteString(funcs[t_blink])
+	}
+	if fg&AttrUnderline != 0 {
+		outbuf.WriteString(funcs[t_underline])
+	}
+	if fg&AttrReverse|bg&AttrReverse != 0 {
+		outbuf.WriteString(funcs[t_reverse])
+	}
+
+	lastfg, lastbg = fg, bg
+}
+
+func send_char(x, y int, ch rune) {
+	var buf [8]byte
+	n := utf8.EncodeRune(buf[:], ch)
+	if x-1 != lastx || y != lasty {
+		write_cursor(x, y)
+	}
+	lastx, lasty = x, y
+	outbuf.Write(buf[:n])
+}
+
+func flush() error {
+	_, err := io.Copy(out, &outbuf)
+	outbuf.Reset()
+	return err
+}
+
+func send_clear() error {
+	send_attr(foreground, background)
+	outbuf.WriteString(funcs[t_clear_screen])
+	if !is_cursor_hidden(cursor_x, cursor_y) {
+		write_cursor(cursor_x, cursor_y)
+	}
+
+	// we need to invalidate cursor position too and these two vars are
+	// used only for simple cursor positioning optimization, cursor
+	// actually may be in the correct place, but we simply discard
+	// optimization once and it gives us simple solution for the case when
+	// cursor moved
+	lastx = coord_invalid
+	lasty = coord_invalid
+
+	return flush()
+}
+
+func update_size_maybe() error {
+	w, h := get_term_size(out.Fd())
+	if w != termw || h != termh {
+		termw, termh = w, h
+		back_buffer.resize(termw, termh)
+		front_buffer.resize(termw, termh)
+		front_buffer.clear()
+		return send_clear()
+	}
+	return nil
+}
+
+func tcsetattr(fd uintptr, termios *syscall_Termios) error {
+	r, _, e := syscall.Syscall(syscall.SYS_IOCTL,
+		fd, uintptr(syscall_TCSETS), uintptr(unsafe.Pointer(termios)))
+	if r != 0 {
+		return os.NewSyscallError("SYS_IOCTL", e)
+	}
+	return nil
+}
+
+func tcgetattr(fd uintptr, termios *syscall_Termios) error {
+	r, _, e := syscall.Syscall(syscall.SYS_IOCTL,
+		fd, uintptr(syscall_TCGETS), uintptr(unsafe.Pointer(termios)))
+	if r != 0 {
+		return os.NewSyscallError("SYS_IOCTL", e)
+	}
+	return nil
+}
+
+func parse_mouse_event(event *Event, buf string) (int, bool) {
+	if strings.HasPrefix(buf, "\033[M") && len(buf) >= 6 {
+		// X10 mouse encoding, the simplest one
+		// \033 [ M Cb Cx Cy
+		b := buf[3] - 32
+		switch b & 3 {
+		case 0:
+			if b&64 != 0 {
+				event.Key = MouseWheelUp
+			} else {
+				event.Key = MouseLeft
+			}
+		case 1:
+			if b&64 != 0 {
+				event.Key = MouseWheelDown
+			} else {
+				event.Key = MouseMiddle
+			}
+		case 2:
+			event.Key = MouseRight
+		case 3:
+			event.Key = MouseRelease
+		default:
+			return 6, false
+		}
+		event.Type = EventMouse // KeyEvent by default
+		if b&32 != 0 {
+			event.Mod |= ModMotion
+		}
+
+		// the coord is 1,1 for upper left
+		event.MouseX = int(buf[4]) - 1 - 32
+		event.MouseY = int(buf[5]) - 1 - 32
+		return 6, true
+	} else if strings.HasPrefix(buf, "\033[<") || strings.HasPrefix(buf, "\033[") {
+		// xterm 1006 extended mode or urxvt 1015 extended mode
+		// xterm: \033 [ < Cb ; Cx ; Cy (M or m)
+		// urxvt: \033 [ Cb ; Cx ; Cy M
+
+		// find the first M or m, that's where we stop
+		mi := strings.IndexAny(buf, "Mm")
+		if mi == -1 {
+			return 0, false
+		}
+
+		// whether it's a capital M or not
+		isM := buf[mi] == 'M'
+
+		// whether it's urxvt or not
+		isU := false
+
+		// buf[2] is safe here, because having M or m found means we have at
+		// least 3 bytes in a string
+		if buf[2] == '<' {
+			buf = buf[3:mi]
+		} else {
+			isU = true
+			buf = buf[2:mi]
+		}
+
+		s1 := strings.Index(buf, ";")
+		s2 := strings.LastIndex(buf, ";")
+		// not found or only one ';'
+		if s1 == -1 || s2 == -1 || s1 == s2 {
+			return 0, false
+		}
+
+		n1, err := strconv.ParseInt(buf[0:s1], 10, 64)
+		if err != nil {
+			return 0, false
+		}
+		n2, err := strconv.ParseInt(buf[s1+1:s2], 10, 64)
+		if err != nil {
+			return 0, false
+		}
+		n3, err := strconv.ParseInt(buf[s2+1:], 10, 64)
+		if err != nil {
+			return 0, false
+		}
+
+		// on urxvt, first number is encoded exactly as in X10, but we need to
+		// make it zero-based, on xterm it is zero-based already
+		if isU {
+			n1 -= 32
+		}
+		switch n1 & 3 {
+		case 0:
+			if n1&64 != 0 {
+				event.Key = MouseWheelUp
+			} else {
+				event.Key = MouseLeft
+			}
+		case 1:
+			if n1&64 != 0 {
+				event.Key = MouseWheelDown
+			} else {
+				event.Key = MouseMiddle
+			}
+		case 2:
+			event.Key = MouseRight
+		case 3:
+			event.Key = MouseRelease
+		default:
+			return mi + 1, false
+		}
+		if !isM {
+			// on xterm mouse release is signaled by lowercase m
+			event.Key = MouseRelease
+		}
+
+		event.Type = EventMouse // KeyEvent by default
+		if n1&32 != 0 {
+			event.Mod |= ModMotion
+		}
+
+		event.MouseX = int(n2) - 1
+		event.MouseY = int(n3) - 1
+		return mi + 1, true
+	}
+
+	return 0, false
+}
+
+func parse_escape_sequence(event *Event, buf []byte) (int, bool) {
+	bufstr := string(buf)
+	for i, key := range keys {
+		if strings.HasPrefix(bufstr, key) {
+			event.Ch = 0
+			event.Key = Key(0xFFFF - i)
+			return len(key), true
+		}
+	}
+
+	// if none of the keys match, let's try mouse sequences
+	return parse_mouse_event(event, bufstr)
+}
+
+func extract_raw_event(data []byte, event *Event) bool {
+	if len(inbuf) == 0 {
+		return false
+	}
+
+	n := len(data)
+	if n == 0 {
+		return false
+	}
+
+	n = copy(data, inbuf)
+	copy(inbuf, inbuf[n:])
+	inbuf = inbuf[:len(inbuf)-n]
+
+	event.N = n
+	event.Type = EventRaw
+	return true
+}
+
+func extract_event(inbuf []byte, event *Event, allow_esc_wait bool) extract_event_res {
+	if len(inbuf) == 0 {
+		event.N = 0
+		return event_not_extracted
+	}
+
+	if inbuf[0] == '\033' {
+		// possible escape sequence
+		if n, ok := parse_escape_sequence(event, inbuf); n != 0 {
+			event.N = n
+			if ok {
+				return event_extracted
+			} else {
+				return event_not_extracted
+			}
+		}
+
+		// possible partially read escape sequence; trigger a wait if appropriate
+		if enable_wait_for_escape_sequence() && allow_esc_wait {
+			event.N = 0
+			return esc_wait
+		}
+
+		// it's not escape sequence, then it's Alt or Esc, check input_mode
+		switch {
+		case input_mode&InputEsc != 0:
+			// if we're in escape mode, fill Esc event, pop buffer, return success
+			event.Ch = 0
+			event.Key = KeyEsc
+			event.Mod = 0
+			event.N = 1
+			return event_extracted
+		case input_mode&InputAlt != 0:
+			// if we're in alt mode, set Alt modifier to event and redo parsing
+			event.Mod = ModAlt
+			status := extract_event(inbuf[1:], event, false)
+			if status == event_extracted {
+				event.N++
+			} else {
+				event.N = 0
+			}
+			return status
+		default:
+			panic("unreachable")
+		}
+	}
+
+	// if we're here, this is not an escape sequence and not an alt sequence
+	// so, it's a FUNCTIONAL KEY or a UNICODE character
+
+	// first of all check if it's a functional key
+	if Key(inbuf[0]) <= KeySpace || Key(inbuf[0]) == KeyBackspace2 {
+		// fill event, pop buffer, return success
+		event.Ch = 0
+		event.Key = Key(inbuf[0])
+		event.N = 1
+		return event_extracted
+	}
+
+	// the only possible option is utf8 rune
+	if r, n := utf8.DecodeRune(inbuf); r != utf8.RuneError {
+		event.Ch = r
+		event.Key = 0
+		event.N = n
+		return event_extracted
+	}
+
+	return event_not_extracted
+}
+
+func fcntl(fd int, cmd int, arg int) (val int, err error) {
+	r, _, e := syscall.Syscall(syscall.SYS_FCNTL, uintptr(fd), uintptr(cmd),
+		uintptr(arg))
+	val = int(r)
+	if e != 0 {
+		err = e
+	}
+	return
+}
diff --git a/vendor/github.com/awesome-gocui/termbox-go/termbox_common.go b/vendor/github.com/awesome-gocui/termbox-go/termbox_common.go
new file mode 100644
index 00000000..c3355cc2
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/termbox_common.go
@@ -0,0 +1,59 @@
+package termbox
+
+// private API, common OS agnostic part
+
+type cellbuf struct {
+	width  int
+	height int
+	cells  []Cell
+}
+
+func (this *cellbuf) init(width, height int) {
+	this.width = width
+	this.height = height
+	this.cells = make([]Cell, width*height)
+}
+
+func (this *cellbuf) resize(width, height int) {
+	if this.width == width && this.height == height {
+		return
+	}
+
+	oldw := this.width
+	oldh := this.height
+	oldcells := this.cells
+
+	this.init(width, height)
+	this.clear()
+
+	minw, minh := oldw, oldh
+
+	if width < minw {
+		minw = width
+	}
+	if height < minh {
+		minh = height
+	}
+
+	for i := 0; i < minh; i++ {
+		srco, dsto := i*oldw, i*width
+		src := oldcells[srco : srco+minw]
+		dst := this.cells[dsto : dsto+minw]
+		copy(dst, src)
+	}
+}
+
+func (this *cellbuf) clear() {
+	for i := range this.cells {
+		c := &this.cells[i]
+		c.Ch = ' '
+		c.Fg = foreground
+		c.Bg = background
+	}
+}
+
+const cursor_hidden = -1
+
+func is_cursor_hidden(x, y int) bool {
+	return x == cursor_hidden || y == cursor_hidden
+}
diff --git a/vendor/github.com/awesome-gocui/termbox-go/termbox_windows.go b/vendor/github.com/awesome-gocui/termbox-go/termbox_windows.go
new file mode 100644
index 00000000..22e0f9ea
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/termbox_windows.go
@@ -0,0 +1,948 @@
+package termbox
+
+import "math"
+import "syscall"
+import "unsafe"
+import "unicode/utf16"
+import "github.com/mattn/go-runewidth"
+
+type (
+	wchar     uint16
+	short     int16
+	dword     uint32
+	word      uint16
+	char_info struct {
+		char wchar
+		attr word
+	}
+	coord struct {
+		x short
+		y short
+	}
+	small_rect struct {
+		left   short
+		top    short
+		right  short
+		bottom short
+	}
+	console_screen_buffer_info struct {
+		size                coord
+		cursor_position     coord
+		attributes          word
+		window              small_rect
+		maximum_window_size coord
+	}
+	console_cursor_info struct {
+		size    dword
+		visible int32
+	}
+	input_record struct {
+		event_type word
+		_          [2]byte
+		event      [16]byte
+	}
+	key_event_record struct {
+		key_down          int32
+		repeat_count      word
+		virtual_key_code  word
+		virtual_scan_code word
+		unicode_char      wchar
+		control_key_state dword
+	}
+	window_buffer_size_record struct {
+		size coord
+	}
+	mouse_event_record struct {
+		mouse_pos         coord
+		button_state      dword
+		control_key_state dword
+		event_flags       dword
+	}
+	console_font_info struct {
+		font      uint32
+		font_size coord
+	}
+)
+
+const (
+	mouse_lmb = 0x1
+	mouse_rmb = 0x2
+	mouse_mmb = 0x4 | 0x8 | 0x10
+	SM_CXMIN  = 28
+	SM_CYMIN  = 29
+)
+
+func (this coord) uintptr() uintptr {
+	return uintptr(*(*int32)(unsafe.Pointer(&this)))
+}
+
+func (this *small_rect) uintptr() uintptr {
+	return uintptr(unsafe.Pointer(this))
+}
+
+var kernel32 = syscall.NewLazyDLL("kernel32.dll")
+var moduser32 = syscall.NewLazyDLL("user32.dll")
+var is_cjk = runewidth.IsEastAsian()
+
+var (
+	proc_set_console_active_screen_buffer = kernel32.NewProc("SetConsoleActiveScreenBuffer")
+	proc_set_console_screen_buffer_size   = kernel32.NewProc("SetConsoleScreenBufferSize")
+	proc_set_console_window_info          = kernel32.NewProc("SetConsoleWindowInfo")
+	proc_create_console_screen_buffer     = kernel32.NewProc("CreateConsoleScreenBuffer")
+	proc_get_console_screen_buffer_info   = kernel32.NewProc("GetConsoleScreenBufferInfo")
+	proc_write_console_output             = kernel32.NewProc("WriteConsoleOutputW")
+	proc_write_console_output_character   = kernel32.NewProc("WriteConsoleOutputCharacterW")
+	proc_write_console_output_attribute   = kernel32.NewProc("WriteConsoleOutputAttribute")
+	proc_set_console_cursor_info          = kernel32.NewProc("SetConsoleCursorInfo")
+	proc_set_console_cursor_position      = kernel32.NewProc("SetConsoleCursorPosition")
+	proc_get_console_cursor_info          = kernel32.NewProc("GetConsoleCursorInfo")
+	proc_read_console_input               = kernel32.NewProc("ReadConsoleInputW")
+	proc_get_console_mode                 = kernel32.NewProc("GetConsoleMode")
+	proc_set_console_mode                 = kernel32.NewProc("SetConsoleMode")
+	proc_fill_console_output_character    = kernel32.NewProc("FillConsoleOutputCharacterW")
+	proc_fill_console_output_attribute    = kernel32.NewProc("FillConsoleOutputAttribute")
+	proc_create_event                     = kernel32.NewProc("CreateEventW")
+	proc_wait_for_multiple_objects        = kernel32.NewProc("WaitForMultipleObjects")
+	proc_set_event                        = kernel32.NewProc("SetEvent")
+	proc_get_current_console_font         = kernel32.NewProc("GetCurrentConsoleFont")
+	get_system_metrics                    = moduser32.NewProc("GetSystemMetrics")
+)
+
+func set_console_active_screen_buffer(h syscall.Handle) (err error) {
+	r0, _, e1 := syscall.Syscall(proc_set_console_active_screen_buffer.Addr(),
+		1, uintptr(h), 0, 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func set_console_screen_buffer_size(h syscall.Handle, size coord) (err error) {
+	r0, _, e1 := syscall.Syscall(proc_set_console_screen_buffer_size.Addr(),
+		2, uintptr(h), size.uintptr(), 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func set_console_window_info(h syscall.Handle, window *small_rect) (err error) {
+	var absolute uint32
+	absolute = 1
+	r0, _, e1 := syscall.Syscall(proc_set_console_window_info.Addr(),
+		3, uintptr(h), uintptr(absolute), window.uintptr())
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func create_console_screen_buffer() (h syscall.Handle, err error) {
+	r0, _, e1 := syscall.Syscall6(proc_create_console_screen_buffer.Addr(),
+		5, uintptr(generic_read|generic_write), 0, 0, console_textmode_buffer, 0, 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return syscall.Handle(r0), err
+}
+
+func get_console_screen_buffer_info(h syscall.Handle, info *console_screen_buffer_info) (err error) {
+	r0, _, e1 := syscall.Syscall(proc_get_console_screen_buffer_info.Addr(),
+		2, uintptr(h), uintptr(unsafe.Pointer(info)), 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func write_console_output(h syscall.Handle, chars []char_info, dst small_rect) (err error) {
+	tmp_coord = coord{dst.right - dst.left + 1, dst.bottom - dst.top + 1}
+	tmp_rect = dst
+	r0, _, e1 := syscall.Syscall6(proc_write_console_output.Addr(),
+		5, uintptr(h), uintptr(unsafe.Pointer(&chars[0])), tmp_coord.uintptr(),
+		tmp_coord0.uintptr(), uintptr(unsafe.Pointer(&tmp_rect)), 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func write_console_output_character(h syscall.Handle, chars []wchar, pos coord) (err error) {
+	r0, _, e1 := syscall.Syscall6(proc_write_console_output_character.Addr(),
+		5, uintptr(h), uintptr(unsafe.Pointer(&chars[0])), uintptr(len(chars)),
+		pos.uintptr(), uintptr(unsafe.Pointer(&tmp_arg)), 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func write_console_output_attribute(h syscall.Handle, attrs []word, pos coord) (err error) {
+	r0, _, e1 := syscall.Syscall6(proc_write_console_output_attribute.Addr(),
+		5, uintptr(h), uintptr(unsafe.Pointer(&attrs[0])), uintptr(len(attrs)),
+		pos.uintptr(), uintptr(unsafe.Pointer(&tmp_arg)), 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func set_console_cursor_info(h syscall.Handle, info *console_cursor_info) (err error) {
+	r0, _, e1 := syscall.Syscall(proc_set_console_cursor_info.Addr(),
+		2, uintptr(h), uintptr(unsafe.Pointer(info)), 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func get_console_cursor_info(h syscall.Handle, info *console_cursor_info) (err error) {
+	r0, _, e1 := syscall.Syscall(proc_get_console_cursor_info.Addr(),
+		2, uintptr(h), uintptr(unsafe.Pointer(info)), 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func set_console_cursor_position(h syscall.Handle, pos coord) (err error) {
+	r0, _, e1 := syscall.Syscall(proc_set_console_cursor_position.Addr(),
+		2, uintptr(h), pos.uintptr(), 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func read_console_input(h syscall.Handle, record *input_record) (err error) {
+	r0, _, e1 := syscall.Syscall6(proc_read_console_input.Addr(),
+		4, uintptr(h), uintptr(unsafe.Pointer(record)), 1, uintptr(unsafe.Pointer(&tmp_arg)), 0, 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func get_console_mode(h syscall.Handle, mode *dword) (err error) {
+	r0, _, e1 := syscall.Syscall(proc_get_console_mode.Addr(),
+		2, uintptr(h), uintptr(unsafe.Pointer(mode)), 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func set_console_mode(h syscall.Handle, mode dword) (err error) {
+	r0, _, e1 := syscall.Syscall(proc_set_console_mode.Addr(),
+		2, uintptr(h), uintptr(mode), 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func fill_console_output_character(h syscall.Handle, char wchar, n int) (err error) {
+	tmp_coord = coord{0, 0}
+	r0, _, e1 := syscall.Syscall6(proc_fill_console_output_character.Addr(),
+		5, uintptr(h), uintptr(char), uintptr(n), tmp_coord.uintptr(),
+		uintptr(unsafe.Pointer(&tmp_arg)), 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func fill_console_output_attribute(h syscall.Handle, attr word, n int) (err error) {
+	tmp_coord = coord{0, 0}
+	r0, _, e1 := syscall.Syscall6(proc_fill_console_output_attribute.Addr(),
+		5, uintptr(h), uintptr(attr), uintptr(n), tmp_coord.uintptr(),
+		uintptr(unsafe.Pointer(&tmp_arg)), 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func create_event() (out syscall.Handle, err error) {
+	r0, _, e1 := syscall.Syscall6(proc_create_event.Addr(),
+		4, 0, 0, 0, 0, 0, 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return syscall.Handle(r0), err
+}
+
+func wait_for_multiple_objects(objects []syscall.Handle) (err error) {
+	r0, _, e1 := syscall.Syscall6(proc_wait_for_multiple_objects.Addr(),
+		4, uintptr(len(objects)), uintptr(unsafe.Pointer(&objects[0])),
+		0, 0xFFFFFFFF, 0, 0)
+	if uint32(r0) == 0xFFFFFFFF {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func set_event(ev syscall.Handle) (err error) {
+	r0, _, e1 := syscall.Syscall(proc_set_event.Addr(),
+		1, uintptr(ev), 0, 0)
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func get_current_console_font(h syscall.Handle, info *console_font_info) (err error) {
+	r0, _, e1 := syscall.Syscall(proc_get_current_console_font.Addr(),
+		3, uintptr(h), 0, uintptr(unsafe.Pointer(info)))
+	if int(r0) == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+type diff_msg struct {
+	pos   short
+	lines short
+	chars []char_info
+}
+
+type input_event struct {
+	event Event
+	err   error
+}
+
+var (
+	orig_cursor_info console_cursor_info
+	orig_size        coord
+	orig_window      small_rect
+	orig_mode        dword
+	orig_screen      syscall.Handle
+	back_buffer      cellbuf
+	front_buffer     cellbuf
+	term_size        coord
+	input_mode       = InputEsc
+	cursor_x         = cursor_hidden
+	cursor_y         = cursor_hidden
+	foreground       = ColorDefault
+	background       = ColorDefault
+	in               syscall.Handle
+	out              syscall.Handle
+	interrupt        syscall.Handle
+	charbuf          []char_info
+	diffbuf          []diff_msg
+	beg_x            = -1
+	beg_y            = -1
+	beg_i            = -1
+	input_comm       = make(chan Event)
+	interrupt_comm   = make(chan struct{})
+	cancel_comm      = make(chan bool, 1)
+	cancel_done_comm = make(chan bool)
+	alt_mode_esc     = false
+
+	// these ones just to prevent heap allocs at all costs
+	tmp_info   console_screen_buffer_info
+	tmp_arg    dword
+	tmp_coord0 = coord{0, 0}
+	tmp_coord  = coord{0, 0}
+	tmp_rect   = small_rect{0, 0, 0, 0}
+	tmp_finfo  console_font_info
+)
+
+func get_cursor_position(out syscall.Handle) coord {
+	err := get_console_screen_buffer_info(out, &tmp_info)
+	if err != nil {
+		panic(err)
+	}
+	return tmp_info.cursor_position
+}
+
+func get_term_size(out syscall.Handle) (coord, small_rect) {
+	err := get_console_screen_buffer_info(out, &tmp_info)
+	if err != nil {
+		panic(err)
+	}
+	return tmp_info.size, tmp_info.window
+}
+
+func get_win_min_size(out syscall.Handle) coord {
+	x, _, err := get_system_metrics.Call(SM_CXMIN)
+	y, _, err := get_system_metrics.Call(SM_CYMIN)
+
+	if x == 0 || y == 0 {
+		if err != nil {
+			panic(err)
+		}
+	}
+
+	err1 := get_current_console_font(out, &tmp_finfo)
+	if err1 != nil {
+		panic(err1)
+	}
+
+	return coord{
+		x: short(math.Ceil(float64(x) / float64(tmp_finfo.font_size.x))),
+		y: short(math.Ceil(float64(y) / float64(tmp_finfo.font_size.y))),
+	}
+}
+
+func get_win_size(out syscall.Handle) coord {
+	err := get_console_screen_buffer_info(out, &tmp_info)
+	if err != nil {
+		panic(err)
+	}
+
+	min_size := get_win_min_size(out)
+
+	size := coord{
+		x: tmp_info.window.right - tmp_info.window.left + 1,
+		y: tmp_info.window.bottom - tmp_info.window.top + 1,
+	}
+
+	if size.x < min_size.x {
+		size.x = min_size.x
+	}
+
+	if size.y < min_size.y {
+		size.y = min_size.y
+	}
+
+	return size
+}
+
+func fix_win_size(out syscall.Handle, size coord) (err error) {
+	window := small_rect{}
+	window.top = 0
+	window.bottom = size.y - 1
+	window.left = 0
+	window.right = size.x - 1
+	return set_console_window_info(out, &window)
+}
+
+func update_size_maybe() {
+	size := get_win_size(out)
+	if size.x != term_size.x || size.y != term_size.y {
+		set_console_screen_buffer_size(out, size)
+		fix_win_size(out, size)
+		term_size = size
+		back_buffer.resize(int(size.x), int(size.y))
+		front_buffer.resize(int(size.x), int(size.y))
+		front_buffer.clear()
+		clear()
+
+		area := int(size.x) * int(size.y)
+		if cap(charbuf) < area {
+			charbuf = make([]char_info, 0, area)
+		}
+	}
+}
+
+var color_table_bg = []word{
+	0, // default (black)
+	0, // black
+	background_red,
+	background_green,
+	background_red | background_green, // yellow
+	background_blue,
+	background_red | background_blue,   // magenta
+	background_green | background_blue, // cyan
+	background_red | background_blue | background_green, // white
+}
+
+var color_table_fg = []word{
+	foreground_red | foreground_blue | foreground_green, // default (white)
+	0,
+	foreground_red,
+	foreground_green,
+	foreground_red | foreground_green, // yellow
+	foreground_blue,
+	foreground_red | foreground_blue,   // magenta
+	foreground_green | foreground_blue, // cyan
+	foreground_red | foreground_blue | foreground_green, // white
+}
+
+const (
+	replacement_char = '\uFFFD'
+	max_rune         = '\U0010FFFF'
+	surr1            = 0xd800
+	surr2            = 0xdc00
+	surr3            = 0xe000
+	surr_self        = 0x10000
+)
+
+func append_diff_line(y int) int {
+	n := 0
+	for x := 0; x < front_buffer.width; {
+		cell_offset := y*front_buffer.width + x
+		back := &back_buffer.cells[cell_offset]
+		front := &front_buffer.cells[cell_offset]
+		attr, char := cell_to_char_info(*back)
+		charbuf = append(charbuf, char_info{attr: attr, char: char[0]})
+		*front = *back
+		n++
+		w := runewidth.RuneWidth(back.Ch)
+		if w == 0 || w == 2 && runewidth.IsAmbiguousWidth(back.Ch) {
+			w = 1
+		}
+		x += w
+		// If not CJK, fill trailing space with whitespace
+		if !is_cjk && w == 2 {
+			charbuf = append(charbuf, char_info{attr: attr, char: ' '})
+		}
+	}
+	return n
+}
+
+// compares 'back_buffer' with 'front_buffer' and prepares all changes in the form of
+// 'diff_msg's in the 'diff_buf'
+func prepare_diff_messages() {
+	// clear buffers
+	diffbuf = diffbuf[:0]
+	charbuf = charbuf[:0]
+
+	var diff diff_msg
+	gbeg := 0
+	for y := 0; y < front_buffer.height; y++ {
+		same := true
+		line_offset := y * front_buffer.width
+		for x := 0; x < front_buffer.width; x++ {
+			cell_offset := line_offset + x
+			back := &back_buffer.cells[cell_offset]
+			front := &front_buffer.cells[cell_offset]
+			if *back != *front {
+				same = false
+				break
+			}
+		}
+		if same && diff.lines > 0 {
+			diffbuf = append(diffbuf, diff)
+			diff = diff_msg{}
+		}
+		if !same {
+			beg := len(charbuf)
+			end := beg + append_diff_line(y)
+			if diff.lines == 0 {
+				diff.pos = short(y)
+				gbeg = beg
+			}
+			diff.lines++
+			diff.chars = charbuf[gbeg:end]
+		}
+	}
+	if diff.lines > 0 {
+		diffbuf = append(diffbuf, diff)
+		diff = diff_msg{}
+	}
+}
+
+func get_ct(table []word, idx int) word {
+	idx = idx & 0x0F
+	if idx >= len(table) {
+		idx = len(table) - 1
+	}
+	return table[idx]
+}
+
+func cell_to_char_info(c Cell) (attr word, wc [2]wchar) {
+	attr = get_ct(color_table_fg, int(c.Fg)) | get_ct(color_table_bg, int(c.Bg))
+	if c.Fg&AttrReverse|c.Bg&AttrReverse != 0 {
+		attr = (attr&0xF0)>>4 | (attr&0x0F)<<4
+	}
+	if c.Fg&AttrBold != 0 {
+		attr |= foreground_intensity
+	}
+	if c.Bg&AttrBold != 0 {
+		attr |= background_intensity
+	}
+
+	r0, r1 := utf16.EncodeRune(c.Ch)
+	if r0 == 0xFFFD {
+		wc[0] = wchar(c.Ch)
+		wc[1] = ' '
+	} else {
+		wc[0] = wchar(r0)
+		wc[1] = wchar(r1)
+	}
+	return
+}
+
+func move_cursor(x, y int) {
+	err := set_console_cursor_position(out, coord{short(x), short(y)})
+	if err != nil {
+		panic(err)
+	}
+}
+
+func show_cursor(visible bool) {
+	var v int32
+	if visible {
+		v = 1
+	}
+
+	var info console_cursor_info
+	info.size = 100
+	info.visible = v
+	err := set_console_cursor_info(out, &info)
+	if err != nil {
+		panic(err)
+	}
+}
+
+func clear() {
+	var err error
+	attr, char := cell_to_char_info(Cell{
+		' ',
+		foreground,
+		background,
+	})
+
+	area := int(term_size.x) * int(term_size.y)
+	err = fill_console_output_attribute(out, attr, area)
+	if err != nil {
+		panic(err)
+	}
+	err = fill_console_output_character(out, char[0], area)
+	if err != nil {
+		panic(err)
+	}
+	if !is_cursor_hidden(cursor_x, cursor_y) {
+		move_cursor(cursor_x, cursor_y)
+	}
+}
+
+func key_event_record_to_event(r *key_event_record) (Event, bool) {
+	if r.key_down == 0 {
+		return Event{}, false
+	}
+
+	e := Event{Type: EventKey}
+	if input_mode&InputAlt != 0 {
+		if alt_mode_esc {
+			e.Mod = ModAlt
+			alt_mode_esc = false
+		}
+		if r.control_key_state&(left_alt_pressed|right_alt_pressed) != 0 {
+			e.Mod = ModAlt
+		}
+	}
+
+	ctrlpressed := r.control_key_state&(left_ctrl_pressed|right_ctrl_pressed) != 0
+
+	if r.virtual_key_code >= vk_f1 && r.virtual_key_code <= vk_f12 {
+		switch r.virtual_key_code {
+		case vk_f1:
+			e.Key = KeyF1
+		case vk_f2:
+			e.Key = KeyF2
+		case vk_f3:
+			e.Key = KeyF3
+		case vk_f4:
+			e.Key = KeyF4
+		case vk_f5:
+			e.Key = KeyF5
+		case vk_f6:
+			e.Key = KeyF6
+		case vk_f7:
+			e.Key = KeyF7
+		case vk_f8:
+			e.Key = KeyF8
+		case vk_f9:
+			e.Key = KeyF9
+		case vk_f10:
+			e.Key = KeyF10
+		case vk_f11:
+			e.Key = KeyF11
+		case vk_f12:
+			e.Key = KeyF12
+		default:
+			panic("unreachable")
+		}
+
+		return e, true
+	}
+
+	if r.virtual_key_code <= vk_delete {
+		switch r.virtual_key_code {
+		case vk_insert:
+			e.Key = KeyInsert
+		case vk_delete:
+			e.Key = KeyDelete
+		case vk_home:
+			e.Key = KeyHome
+		case vk_end:
+			e.Key = KeyEnd
+		case vk_pgup:
+			e.Key = KeyPgup
+		case vk_pgdn:
+			e.Key = KeyPgdn
+		case vk_arrow_up:
+			e.Key = KeyArrowUp
+		case vk_arrow_down:
+			e.Key = KeyArrowDown
+		case vk_arrow_left:
+			e.Key = KeyArrowLeft
+		case vk_arrow_right:
+			e.Key = KeyArrowRight
+		case vk_backspace:
+			if ctrlpressed {
+				e.Key = KeyBackspace2
+			} else {
+				e.Key = KeyBackspace
+			}
+		case vk_tab:
+			e.Key = KeyTab
+		case vk_enter:
+			e.Key = KeyEnter
+		case vk_esc:
+			switch {
+			case input_mode&InputEsc != 0:
+				e.Key = KeyEsc
+			case input_mode&InputAlt != 0:
+				alt_mode_esc = true
+				return Event{}, false
+			}
+		case vk_space:
+			if ctrlpressed {
+				// manual return here, because KeyCtrlSpace is zero
+				e.Key = KeyCtrlSpace
+				return e, true
+			} else {
+				e.Key = KeySpace
+			}
+		}
+
+		if e.Key != 0 {
+			return e, true
+		}
+	}
+
+	if ctrlpressed {
+		if Key(r.unicode_char) >= KeyCtrlA && Key(r.unicode_char) <= KeyCtrlRsqBracket {
+			e.Key = Key(r.unicode_char)
+			if input_mode&InputAlt != 0 && e.Key == KeyEsc {
+				alt_mode_esc = true
+				return Event{}, false
+			}
+			return e, true
+		}
+		switch r.virtual_key_code {
+		case 192, 50:
+			// manual return here, because KeyCtrl2 is zero
+			e.Key = KeyCtrl2
+			return e, true
+		case 51:
+			if input_mode&InputAlt != 0 {
+				alt_mode_esc = true
+				return Event{}, false
+			}
+			e.Key = KeyCtrl3
+		case 52:
+			e.Key = KeyCtrl4
+		case 53:
+			e.Key = KeyCtrl5
+		case 54:
+			e.Key = KeyCtrl6
+		case 189, 191, 55:
+			e.Key = KeyCtrl7
+		case 8, 56:
+			e.Key = KeyCtrl8
+		}
+
+		if e.Key != 0 {
+			return e, true
+		}
+	}
+
+	if r.unicode_char != 0 {
+		e.Ch = rune(r.unicode_char)
+		return e, true
+	}
+
+	return Event{}, false
+}
+
+func input_event_producer() {
+	var r input_record
+	var err error
+	var last_button Key
+	var last_button_pressed Key
+	var last_state = dword(0)
+	var last_x, last_y = -1, -1
+	handles := []syscall.Handle{in, interrupt}
+	for {
+		err = wait_for_multiple_objects(handles)
+		if err != nil {
+			input_comm <- Event{Type: EventError, Err: err}
+		}
+
+		select {
+		case <-cancel_comm:
+			cancel_done_comm <- true
+			return
+		default:
+		}
+
+		err = read_console_input(in, &r)
+		if err != nil {
+			input_comm <- Event{Type: EventError, Err: err}
+		}
+
+		switch r.event_type {
+		case key_event:
+			kr := (*key_event_record)(unsafe.Pointer(&r.event))
+			ev, ok := key_event_record_to_event(kr)
+			if ok {
+				for i := 0; i < int(kr.repeat_count); i++ {
+					input_comm <- ev
+				}
+			}
+		case window_buffer_size_event:
+			sr := *(*window_buffer_size_record)(unsafe.Pointer(&r.event))
+			input_comm <- Event{
+				Type:   EventResize,
+				Width:  int(sr.size.x),
+				Height: int(sr.size.y),
+			}
+		case mouse_event:
+			mr := *(*mouse_event_record)(unsafe.Pointer(&r.event))
+			ev := Event{Type: EventMouse}
+			switch mr.event_flags {
+			case 0, 2:
+				// single or double click
+				cur_state := mr.button_state
+				switch {
+				case last_state&mouse_lmb == 0 && cur_state&mouse_lmb != 0:
+					last_button = MouseLeft
+					last_button_pressed = last_button
+				case last_state&mouse_rmb == 0 && cur_state&mouse_rmb != 0:
+					last_button = MouseRight
+					last_button_pressed = last_button
+				case last_state&mouse_mmb == 0 && cur_state&mouse_mmb != 0:
+					last_button = MouseMiddle
+					last_button_pressed = last_button
+				case last_state&mouse_lmb != 0 && cur_state&mouse_lmb == 0:
+					last_button = MouseRelease
+				case last_state&mouse_rmb != 0 && cur_state&mouse_rmb == 0:
+					last_button = MouseRelease
+				case last_state&mouse_mmb != 0 && cur_state&mouse_mmb == 0:
+					last_button = MouseRelease
+				default:
+					last_state = cur_state
+					continue
+				}
+				last_state = cur_state
+				ev.Key = last_button
+				last_x, last_y = int(mr.mouse_pos.x), int(mr.mouse_pos.y)
+				ev.MouseX = last_x
+				ev.MouseY = last_y
+			case 1:
+				// mouse motion
+				x, y := int(mr.mouse_pos.x), int(mr.mouse_pos.y)
+				if last_state != 0 && (last_x != x || last_y != y) {
+					ev.Key = last_button_pressed
+					ev.Mod = ModMotion
+					ev.MouseX = x
+					ev.MouseY = y
+					last_x, last_y = x, y
+				} else {
+					ev.Type = EventNone
+				}
+			case 4:
+				// mouse wheel
+				n := int16(mr.button_state >> 16)
+				if n > 0 {
+					ev.Key = MouseWheelUp
+				} else {
+					ev.Key = MouseWheelDown
+				}
+				last_x, last_y = int(mr.mouse_pos.x), int(mr.mouse_pos.y)
+				ev.MouseX = last_x
+				ev.MouseY = last_y
+			default:
+				ev.Type = EventNone
+			}
+			if ev.Type != EventNone {
+				input_comm <- ev
+			}
+		}
+	}
+}
diff --git a/vendor/github.com/awesome-gocui/termbox-go/terminfo.go b/vendor/github.com/awesome-gocui/termbox-go/terminfo.go
new file mode 100644
index 00000000..ab2e7a19
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/terminfo.go
@@ -0,0 +1,232 @@
+// +build !windows
+// This file contains a simple and incomplete implementation of the terminfo
+// database. Information was taken from the ncurses manpages term(5) and
+// terminfo(5). Currently, only the string capabilities for special keys and for
+// functions without parameters are actually used. Colors are still done with
+// ANSI escape sequences. Other special features that are not (yet?) supported
+// are reading from ~/.terminfo, the TERMINFO_DIRS variable, Berkeley database
+// format and extended capabilities.
+
+package termbox
+
+import (
+	"bytes"
+	"encoding/binary"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strings"
+)
+
+const (
+	ti_magic         = 0432
+	ti_header_length = 12
+	ti_mouse_enter   = "\x1b[?1000h\x1b[?1002h\x1b[?1015h\x1b[?1006h"
+	ti_mouse_leave   = "\x1b[?1006l\x1b[?1015l\x1b[?1002l\x1b[?1000l"
+)
+
+func load_terminfo() ([]byte, error) {
+	var data []byte
+	var err error
+
+	term := os.Getenv("TERM")
+	if term == "" {
+		return nil, fmt.Errorf("termbox: TERM not set")
+	}
+
+	// The following behaviour follows the one described in terminfo(5) as
+	// distributed by ncurses.
+
+	terminfo := os.Getenv("TERMINFO")
+	if terminfo != "" {
+		// if TERMINFO is set, no other directory should be searched
+		return ti_try_path(terminfo)
+	}
+
+	// next, consider ~/.terminfo
+	home := os.Getenv("HOME")
+	if home != "" {
+		data, err = ti_try_path(home + "/.terminfo")
+		if err == nil {
+			return data, nil
+		}
+	}
+
+	// next, TERMINFO_DIRS
+	dirs := os.Getenv("TERMINFO_DIRS")
+	if dirs != "" {
+		for _, dir := range strings.Split(dirs, ":") {
+			if dir == "" {
+				// "" -> "/usr/share/terminfo"
+				dir = "/usr/share/terminfo"
+			}
+			data, err = ti_try_path(dir)
+			if err == nil {
+				return data, nil
+			}
+		}
+	}
+
+	// next, /lib/terminfo
+	data, err = ti_try_path("/lib/terminfo")
+	if err == nil {
+		return data, nil
+	}
+
+	// fall back to /usr/share/terminfo
+	return ti_try_path("/usr/share/terminfo")
+}
+
+func ti_try_path(path string) (data []byte, err error) {
+	// load_terminfo already made sure it is set
+	term := os.Getenv("TERM")
+
+	// first try, the typical *nix path
+	terminfo := path + "/" + term[0:1] + "/" + term
+	data, err = ioutil.ReadFile(terminfo)
+	if err == nil {
+		return
+	}
+
+	// fallback to darwin specific dirs structure
+	terminfo = path + "/" + hex.EncodeToString([]byte(term[:1])) + "/" + term
+	data, err = ioutil.ReadFile(terminfo)
+	return
+}
+
+func setup_term_builtin() error {
+	name := os.Getenv("TERM")
+	if name == "" {
+		return errors.New("termbox: TERM environment variable not set")
+	}
+
+	for _, t := range terms {
+		if t.name == name {
+			keys = t.keys
+			funcs = t.funcs
+			return nil
+		}
+	}
+
+	compat_table := []struct {
+		partial string
+		keys    []string
+		funcs   []string
+	}{
+		{"xterm", xterm_keys, xterm_funcs},
+		{"rxvt", rxvt_unicode_keys, rxvt_unicode_funcs},
+		{"linux", linux_keys, linux_funcs},
+		{"Eterm", eterm_keys, eterm_funcs},
+		{"screen", screen_keys, screen_funcs},
+		// let's assume that 'cygwin' is xterm compatible
+		{"cygwin", xterm_keys, xterm_funcs},
+		{"st", xterm_keys, xterm_funcs},
+	}
+
+	// try compatibility variants
+	for _, it := range compat_table {
+		if strings.Contains(name, it.partial) {
+			keys = it.keys
+			funcs = it.funcs
+			return nil
+		}
+	}
+
+	return errors.New("termbox: unsupported terminal")
+}
+
+func setup_term() (err error) {
+	var data []byte
+	var header [6]int16
+	var str_offset, table_offset int16
+
+	data, err = load_terminfo()
+	if err != nil {
+		return setup_term_builtin()
+	}
+
+	rd := bytes.NewReader(data)
+	// 0: magic number, 1: size of names section, 2: size of boolean section, 3:
+	// size of numbers section (in integers), 4: size of the strings section (in
+	// integers), 5: size of the string table
+
+	err = binary.Read(rd, binary.LittleEndian, header[:])
+	if err != nil {
+		return
+	}
+
+	number_sec_len := int16(2)
+	if header[0] == 542 { // doc says it should be octal 0542, but what I see it terminfo files is 542, learn to program please... thank you..
+		number_sec_len = 4
+	}
+
+	if (header[1]+header[2])%2 != 0 {
+		// old quirk to align everything on word boundaries
+		header[2] += 1
+	}
+	str_offset = ti_header_length + header[1] + header[2] + number_sec_len*header[3]
+	table_offset = str_offset + 2*header[4]
+
+	keys = make([]string, 0xFFFF-key_min)
+	for i, _ := range keys {
+		keys[i], err = ti_read_string(rd, str_offset+2*ti_keys[i], table_offset)
+		if err != nil {
+			return
+		}
+	}
+	funcs = make([]string, t_max_funcs)
+	// the last two entries are reserved for mouse. because the table offset is
+	// not there, the two entries have to fill in manually
+	for i, _ := range funcs[:len(funcs)-2] {
+		funcs[i], err = ti_read_string(rd, str_offset+2*ti_funcs[i], table_offset)
+		if err != nil {
+			return
+		}
+	}
+	funcs[t_max_funcs-2] = ti_mouse_enter
+	funcs[t_max_funcs-1] = ti_mouse_leave
+	return nil
+}
+
+func ti_read_string(rd *bytes.Reader, str_off, table int16) (string, error) {
+	var off int16
+
+	_, err := rd.Seek(int64(str_off), 0)
+	if err != nil {
+		return "", err
+	}
+	err = binary.Read(rd, binary.LittleEndian, &off)
+	if err != nil {
+		return "", err
+	}
+	_, err = rd.Seek(int64(table+off), 0)
+	if err != nil {
+		return "", err
+	}
+	var bs []byte
+	for {
+		b, err := rd.ReadByte()
+		if err != nil {
+			return "", err
+		}
+		if b == byte(0x00) {
+			break
+		}
+		bs = append(bs, b)
+	}
+	return string(bs), nil
+}
+
+// "Maps" the function constants from termbox.go to the number of the respective
+// string capability in the terminfo file. Taken from (ncurses) term.h.
+var ti_funcs = []int16{
+	28, 40, 16, 13, 5, 39, 36, 27, 26, 34, 89, 88,
+}
+
+// Same as above for the special keys.
+var ti_keys = []int16{
+	66, 68 /* apparently not a typo; 67 is F10 for whatever reason */, 69, 70,
+	71, 72, 73, 74, 75, 67, 216, 217, 77, 59, 76, 164, 82, 81, 87, 61, 79, 83,
+}
diff --git a/vendor/github.com/awesome-gocui/termbox-go/terminfo_builtin.go b/vendor/github.com/awesome-gocui/termbox-go/terminfo_builtin.go
new file mode 100644
index 00000000..a9486606
--- /dev/null
+++ b/vendor/github.com/awesome-gocui/termbox-go/terminfo_builtin.go
@@ -0,0 +1,64 @@
+// +build !windows
+
+package termbox
+
+// Eterm
+var eterm_keys = []string{
+	"\x1b[11~", "\x1b[12~", "\x1b[13~", "\x1b[14~", "\x1b[15~", "\x1b[17~", "\x1b[18~", "\x1b[19~", "\x1b[20~", "\x1b[21~", "\x1b[23~", "\x1b[24~", "\x1b[2~", "\x1b[3~", "\x1b[7~", "\x1b[8~", "\x1b[5~", "\x1b[6~", "\x1b[A", "\x1b[B", "\x1b[D", "\x1b[C",
+}
+var eterm_funcs = []string{
+	"\x1b7\x1b[?47h", "\x1b[2J\x1b[?47l\x1b8", "\x1b[?25h", "\x1b[?25l", "\x1b[H\x1b[2J", "\x1b[m\x0f", "\x1b[4m", "\x1b[1m", "\x1b[5m", "\x1b[7m", "", "", "", "",
+}
+
+// screen
+var screen_keys = []string{
+	"\x1bOP", "\x1bOQ", "\x1bOR", "\x1bOS", "\x1b[15~", "\x1b[17~", "\x1b[18~", "\x1b[19~", "\x1b[20~", "\x1b[21~", "\x1b[23~", "\x1b[24~", "\x1b[2~", "\x1b[3~", "\x1b[1~", "\x1b[4~", "\x1b[5~", "\x1b[6~", "\x1bOA", "\x1bOB", "\x1bOD", "\x1bOC",
+}
+var screen_funcs = []string{
+	"\x1b[?1049h", "\x1b[?1049l", "\x1b[34h\x1b[?25h", "\x1b[?25l", "\x1b[H\x1b[J", "\x1b[m\x0f", "\x1b[4m", "\x1b[1m", "\x1b[5m", "\x1b[7m", "\x1b[?1h\x1b=", "\x1b[?1l\x1b>", ti_mouse_enter, ti_mouse_leave,
+}
+
+// xterm
+var xterm_keys = []string{
+	"\x1bOP", "\x1bOQ", "\x1bOR", "\x1bOS", "\x1b[15~", "\x1b[17~", "\x1b[18~", "\x1b[19~", "\x1b[20~", "\x1b[21~", "\x1b[23~", "\x1b[24~", "\x1b[2~", "\x1b[3~", "\x1bOH", "\x1bOF", "\x1b[5~", "\x1b[6~", "\x1bOA", "\x1bOB", "\x1bOD", "\x1bOC",
+}
+var xterm_funcs = []string{
+	"\x1b[?1049h", "\x1b[?1049l", "\x1b[?12l\x1b[?25h", "\x1b[?25l", "\x1b[H\x1b[2J", "\x1b(B\x1b[m", "\x1b[4m", "\x1b[1m", "\x1b[5m", "\x1b[7m", "\x1b[?1h\x1b=", "\x1b[?1l\x1b>", ti_mouse_enter, ti_mouse_leave,
+}
+
+// rxvt-unicode
+var rxvt_unicode_keys = []string{
+	"\x1b[11~", "\x1b[12~", "\x1b[13~", "\x1b[14~", "\x1b[15~", "\x1b[17~", "\x1b[18~", "\x1b[19~", "\x1b[20~", "\x1b[21~", "\x1b[23~", "\x1b[24~", "\x1b[2~", "\x1b[3~", "\x1b[7~", "\x1b[8~", "\x1b[5~", "\x1b[6~", "\x1b[A", "\x1b[B", "\x1b[D", "\x1b[C",
+}
+var rxvt_unicode_funcs = []string{
+	"\x1b[?1049h", "\x1b[r\x1b[?1049l", "\x1b[?25h", "\x1b[?25l", "\x1b[H\x1b[2J", "\x1b[m\x1b(B", "\x1b[4m", "\x1b[1m", "\x1b[5m", "\x1b[7m", "\x1b=", "\x1b>", ti_mouse_enter, ti_mouse_leave,
+}
+
+// linux
+var linux_keys = []string{
+	"\x1b[[A", "\x1b[[B", "\x1b[[C", "\x1b[[D", "\x1b[[E", "\x1b[17~", "\x1b[18~", "\x1b[19~", "\x1b[20~", "\x1b[21~", "\x1b[23~", "\x1b[24~", "\x1b[2~", "\x1b[3~", "\x1b[1~", "\x1b[4~", "\x1b[5~", "\x1b[6~", "\x1b[A", "\x1b[B", "\x1b[D", "\x1b[C",
+}
+var linux_funcs = []string{
+	"", "", "\x1b[?25h\x1b[?0c", "\x1b[?25l\x1b[?1c", "\x1b[H\x1b[J", "\x1b[0;10m", "\x1b[4m", "\x1b[1m", "\x1b[5m", "\x1b[7m", "", "", "", "",
+}
+
+// rxvt-256color
+var rxvt_256color_keys = []string{
+	"\x1b[11~", "\x1b[12~", "\x1b[13~", "\x1b[14~", "\x1b[15~", "\x1b[17~", "\x1b[18~", "\x1b[19~", "\x1b[20~", "\x1b[21~", "\x1b[23~", "\x1b[24~", "\x1b[2~", "\x1b[3~", "\x1b[7~", "\x1b[8~", "\x1b[5~", "\x1b[6~", "\x1b[A", "\x1b[B", "\x1b[D", "\x1b[C",
+}
+var rxvt_256color_funcs = []string{
+	"\x1b7\x1b[?47h", "\x1b[2J\x1b[?47l\x1b8", "\x1b[?25h", "\x1b[?25l", "\x1b[H\x1b[2J", "\x1b[m\x0f", "\x1b[4m", "\x1b[1m", "\x1b[5m", "\x1b[7m", "\x1b=", "\x1b>", ti_mouse_enter, ti_mouse_leave,
+}
+
+var terms = []struct {
+	name  string
+	keys  []string
+	funcs []string
+}{
+	{"Eterm", eterm_keys, eterm_funcs},
+	{"screen", screen_keys, screen_funcs},
+	{"xterm", xterm_keys, xterm_funcs},
+	{"rxvt-unicode", rxvt_unicode_keys, rxvt_unicode_funcs},
+	{"linux", linux_keys, linux_funcs},
+	{"rxvt-256color", rxvt_256color_keys, rxvt_256color_funcs},
+}