Godeps, vendor: convert dependency management to trash (#3198)

This commit converts the dependency management from Godeps to the vendor
folder, also switching the tool from godep to trash. Since the upstream tool
lacks a few features proposed via a few PRs, until those PRs are merged in
(if), use github.com/karalabe/trash.

You can update dependencies via trash --update.

All dependencies have been updated to their latest version.

Parts of the build system are reworked to drop old notions of Godeps and
invocation of the go vet command so that it doesn't run against the vendor
folder, as that will just blow up during vetting.

The conversion drops OpenCL (and hence GPU mining support) from ethash and our
codebase. The short reasoning is that there's noone to maintain and having
opencl libs in our deps messes up builds as go install ./... tries to build
them, failing with unsatisfied link errors for the C OpenCL deps.

golang.org/x/net/context is not vendored in. We expect it to be fetched by the
user (i.e. using go get). To keep ci.go builds reproducible the package is
"vendored" in build/_vendor.

vendor/github.com/peterh/liner/COPYING

@@ -0,0 +1,21 @@
+Copyright © 2012 Peter Harris
+
+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 (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+

vendor/github.com/peterh/liner/README.md

@@ -0,0 +1,100 @@
+Liner
+=====
+
+Liner is a command line editor with history. It was inspired by linenoise;
+everything Unix-like is a VT100 (or is trying very hard to be). If your
+terminal is not pretending to be a VT100, change it. Liner also support
+Windows.
+
+Liner is released under the X11 license (which is similar to the new BSD
+license).
+
+Line Editing
+------------
+
+The following line editing commands are supported on platforms and terminals
+that Liner supports:
+
+Keystroke    | Action
+---------    | ------
+Ctrl-A, Home | Move cursor to beginning of line
+Ctrl-E, End  | Move cursor to end of line
+Ctrl-B, Left | Move cursor one character left
+Ctrl-F, Right| Move cursor one character right
+Ctrl-Left, Alt-B    | Move cursor to previous word
+Ctrl-Right, Alt-F   | Move cursor to next word
+Ctrl-D, Del  | (if line is *not* empty) Delete character under cursor
+Ctrl-D       | (if line *is* empty) End of File - usually quits application
+Ctrl-C       | Reset input (create new empty prompt)
+Ctrl-L       | Clear screen (line is unmodified)
+Ctrl-T       | Transpose previous character with current character
+Ctrl-H, BackSpace | Delete character before cursor
+Ctrl-W       | Delete word leading up to cursor
+Ctrl-K       | Delete from cursor to end of line
+Ctrl-U       | Delete from start of line to cursor
+Ctrl-P, Up   | Previous match from history
+Ctrl-N, Down | Next match from history
+Ctrl-R       | Reverse Search history (Ctrl-S forward, Ctrl-G cancel)
+Ctrl-Y       | Paste from Yank buffer (Alt-Y to paste next yank instead)
+Tab          | Next completion
+Shift-Tab    | (after Tab) Previous completion
+
+Getting started
+-----------------
+
+```go
+package main
+
+import (
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/peterh/liner"
+)
+
+var (
+	history_fn = filepath.Join(os.TempDir(), ".liner_example_history")
+	names      = []string{"john", "james", "mary", "nancy"}
+)
+
+func main() {
+	line := liner.NewLiner()
+	defer line.Close()
+
+	line.SetCtrlCAborts(true)
+
+	line.SetCompleter(func(line string) (c []string) {
+		for _, n := range names {
+			if strings.HasPrefix(n, strings.ToLower(line)) {
+				c = append(c, n)
+			}
+		}
+		return
+	})
+
+	if f, err := os.Open(history_fn); err == nil {
+		line.ReadHistory(f)
+		f.Close()
+	}
+
+	if name, err := line.Prompt("What is your name? "); err == nil {
+		log.Print("Got: ", name)
+		line.AppendHistory(name)
+	} else if err == liner.ErrPromptAborted {
+		log.Print("Aborted")
+	} else {
+		log.Print("Error reading line: ", err)
+	}
+
+	if f, err := os.Create(history_fn); err != nil {
+		log.Print("Error writing history file: ", err)
+	} else {
+		line.WriteHistory(f)
+		f.Close()
+	}
+}
+```
+
+For documentation, see http://godoc.org/github.com/peterh/liner

vendor/github.com/peterh/liner/bsdinput.go

@@ -0,0 +1,41 @@
+// +build openbsd freebsd netbsd
+
+package liner
+
+import "syscall"
+
+const (
+	getTermios = syscall.TIOCGETA
+	setTermios = syscall.TIOCSETA
+)
+
+const (
+	// Input flags
+	inpck  = 0x010
+	istrip = 0x020
+	icrnl  = 0x100
+	ixon   = 0x200
+
+	// Output flags
+	opost = 0x1
+
+	// Control flags
+	cs8 = 0x300
+
+	// Local flags
+	isig   = 0x080
+	icanon = 0x100
+	iexten = 0x400
+)
+
+type termios struct {
+	Iflag  uint32
+	Oflag  uint32
+	Cflag  uint32
+	Lflag  uint32
+	Cc     [20]byte
+	Ispeed int32
+	Ospeed int32
+}
+
+const cursorColumn = false

vendor/github.com/peterh/liner/common.go

@@ -0,0 +1,237 @@
+/*
+Package liner implements a simple command line editor, inspired by linenoise
+(https://github.com/antirez/linenoise/). This package supports WIN32 in
+addition to the xterm codes supported by everything else.
+*/
+package liner
+
+import (
+	"bufio"
+	"container/ring"
+	"errors"
+	"fmt"
+	"io"
+	"strings"
+	"sync"
+	"unicode/utf8"
+)
+
+type commonState struct {
+	terminalSupported bool
+	outputRedirected  bool
+	inputRedirected   bool
+	history           []string
+	historyMutex      sync.RWMutex
+	completer         WordCompleter
+	columns           int
+	killRing          *ring.Ring
+	ctrlCAborts       bool
+	r                 *bufio.Reader
+	tabStyle          TabStyle
+	multiLineMode     bool
+	cursorRows        int
+	maxRows           int
+	shouldRestart     ShouldRestart
+}
+
+// TabStyle is used to select how tab completions are displayed.
+type TabStyle int
+
+// Two tab styles are currently available:
+//
+// TabCircular cycles through each completion item and displays it directly on
+// the prompt
+//
+// TabPrints prints the list of completion items to the screen after a second
+// tab key is pressed. This behaves similar to GNU readline and BASH (which
+// uses readline)
+const (
+	TabCircular TabStyle = iota
+	TabPrints
+)
+
+// ErrPromptAborted is returned from Prompt or PasswordPrompt when the user presses Ctrl-C
+// if SetCtrlCAborts(true) has been called on the State
+var ErrPromptAborted = errors.New("prompt aborted")
+
+// ErrNotTerminalOutput is returned from Prompt or PasswordPrompt if the
+// platform is normally supported, but stdout has been redirected
+var ErrNotTerminalOutput = errors.New("standard output is not a terminal")
+
+// Max elements to save on the killring
+const KillRingMax = 60
+
+// HistoryLimit is the maximum number of entries saved in the scrollback history.
+const HistoryLimit = 1000
+
+// ReadHistory reads scrollback history from r. Returns the number of lines
+// read, and any read error (except io.EOF).
+func (s *State) ReadHistory(r io.Reader) (num int, err error) {
+	s.historyMutex.Lock()
+	defer s.historyMutex.Unlock()
+
+	in := bufio.NewReader(r)
+	num = 0
+	for {
+		line, part, err := in.ReadLine()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return num, err
+		}
+		if part {
+			return num, fmt.Errorf("line %d is too long", num+1)
+		}
+		if !utf8.Valid(line) {
+			return num, fmt.Errorf("invalid string at line %d", num+1)
+		}
+		num++
+		s.history = append(s.history, string(line))
+		if len(s.history) > HistoryLimit {
+			s.history = s.history[1:]
+		}
+	}
+	return num, nil
+}
+
+// WriteHistory writes scrollback history to w. Returns the number of lines
+// successfully written, and any write error.
+//
+// Unlike the rest of liner's API, WriteHistory is safe to call
+// from another goroutine while Prompt is in progress.
+// This exception is to facilitate the saving of the history buffer
+// during an unexpected exit (for example, due to Ctrl-C being invoked)
+func (s *State) WriteHistory(w io.Writer) (num int, err error) {
+	s.historyMutex.RLock()
+	defer s.historyMutex.RUnlock()
+
+	for _, item := range s.history {
+		_, err := fmt.Fprintln(w, item)
+		if err != nil {
+			return num, err
+		}
+		num++
+	}
+	return num, nil
+}
+
+// AppendHistory appends an entry to the scrollback history. AppendHistory
+// should be called iff Prompt returns a valid command.
+func (s *State) AppendHistory(item string) {
+	s.historyMutex.Lock()
+	defer s.historyMutex.Unlock()
+
+	if len(s.history) > 0 {
+		if item == s.history[len(s.history)-1] {
+			return
+		}
+	}
+	s.history = append(s.history, item)
+	if len(s.history) > HistoryLimit {
+		s.history = s.history[1:]
+	}
+}
+
+// Returns the history lines starting with prefix
+func (s *State) getHistoryByPrefix(prefix string) (ph []string) {
+	for _, h := range s.history {
+		if strings.HasPrefix(h, prefix) {
+			ph = append(ph, h)
+		}
+	}
+	return
+}
+
+// Returns the history lines matching the inteligent search
+func (s *State) getHistoryByPattern(pattern string) (ph []string, pos []int) {
+	if pattern == "" {
+		return
+	}
+	for _, h := range s.history {
+		if i := strings.Index(h, pattern); i >= 0 {
+			ph = append(ph, h)
+			pos = append(pos, i)
+		}
+	}
+	return
+}
+
+// Completer takes the currently edited line content at the left of the cursor
+// and returns a list of completion candidates.
+// If the line is "Hello, wo!!!" and the cursor is before the first '!', "Hello, wo" is passed
+// to the completer which may return {"Hello, world", "Hello, Word"} to have "Hello, world!!!".
+type Completer func(line string) []string
+
+// WordCompleter takes the currently edited line with the cursor position and
+// returns the completion candidates for the partial word to be completed.
+// If the line is "Hello, wo!!!" and the cursor is before the first '!', ("Hello, wo!!!", 9) is passed
+// to the completer which may returns ("Hello, ", {"world", "Word"}, "!!!") to have "Hello, world!!!".
+type WordCompleter func(line string, pos int) (head string, completions []string, tail string)
+
+// SetCompleter sets the completion function that Liner will call to
+// fetch completion candidates when the user presses tab.
+func (s *State) SetCompleter(f Completer) {
+	if f == nil {
+		s.completer = nil
+		return
+	}
+	s.completer = func(line string, pos int) (string, []string, string) {
+		return "", f(string([]rune(line)[:pos])), string([]rune(line)[pos:])
+	}
+}
+
+// SetWordCompleter sets the completion function that Liner will call to
+// fetch completion candidates when the user presses tab.
+func (s *State) SetWordCompleter(f WordCompleter) {
+	s.completer = f
+}
+
+// SetTabCompletionStyle sets the behvavior when the Tab key is pressed
+// for auto-completion.  TabCircular is the default behavior and cycles
+// through the list of candidates at the prompt.  TabPrints will print
+// the available completion candidates to the screen similar to BASH
+// and GNU Readline
+func (s *State) SetTabCompletionStyle(tabStyle TabStyle) {
+	s.tabStyle = tabStyle
+}
+
+// ModeApplier is the interface that wraps a representation of the terminal
+// mode. ApplyMode sets the terminal to this mode.
+type ModeApplier interface {
+	ApplyMode() error
+}
+
+// SetCtrlCAborts sets whether Prompt on a supported terminal will return an
+// ErrPromptAborted when Ctrl-C is pressed. The default is false (will not
+// return when Ctrl-C is pressed). Unsupported terminals typically raise SIGINT
+// (and Prompt does not return) regardless of the value passed to SetCtrlCAborts.
+func (s *State) SetCtrlCAborts(aborts bool) {
+	s.ctrlCAborts = aborts
+}
+
+// SetMultiLineMode sets whether line is auto-wrapped. The default is false (single line).
+func (s *State) SetMultiLineMode(mlmode bool) {
+	s.multiLineMode = mlmode
+}
+
+// ShouldRestart is passed the error generated by readNext and returns true if
+// the the read should be restarted or false if the error should be returned.
+type ShouldRestart func(err error) bool
+
+// SetShouldRestart sets the restart function that Liner will call to determine
+// whether to retry the call to, or return the error returned by, readNext.
+func (s *State) SetShouldRestart(f ShouldRestart) {
+	s.shouldRestart = f
+}
+
+func (s *State) promptUnsupported(p string) (string, error) {
+	if !s.inputRedirected || !s.terminalSupported {
+		fmt.Print(p)
+	}
+	linebuf, _, err := s.r.ReadLine()
+	if err != nil {
+		return "", err
+	}
+	return string(linebuf), nil
+}

vendor/github.com/peterh/liner/fallbackinput.go

@@ -0,0 +1,57 @@
+// +build !windows,!linux,!darwin,!openbsd,!freebsd,!netbsd
+
+package liner
+
+import (
+	"bufio"
+	"errors"
+	"os"
+)
+
+// State represents an open terminal
+type State struct {
+	commonState
+}
+
+// Prompt displays p, and then waits for user input. Prompt does not support
+// line editing on this operating system.
+func (s *State) Prompt(p string) (string, error) {
+	return s.promptUnsupported(p)
+}
+
+// PasswordPrompt is not supported in this OS.
+func (s *State) PasswordPrompt(p string) (string, error) {
+	return "", errors.New("liner: function not supported in this terminal")
+}
+
+// NewLiner initializes a new *State
+//
+// Note that this operating system uses a fallback mode without line
+// editing. Patches welcome.
+func NewLiner() *State {
+	var s State
+	s.r = bufio.NewReader(os.Stdin)
+	return &s
+}
+
+// Close returns the terminal to its previous mode
+func (s *State) Close() error {
+	return nil
+}
+
+// TerminalSupported returns false because line editing is not
+// supported on this platform.
+func TerminalSupported() bool {
+	return false
+}
+
+type noopMode struct{}
+
+func (n noopMode) ApplyMode() error {
+	return nil
+}
+
+// TerminalMode returns a noop InputModeSetter on this platform.
+func TerminalMode() (ModeApplier, error) {
+	return noopMode{}, nil
+}

vendor/github.com/peterh/liner/input.go

@@ -0,0 +1,367 @@
+// +build linux darwin openbsd freebsd netbsd
+
+package liner
+
+import (
+	"bufio"
+	"errors"
+	"os"
+	"os/signal"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+)
+
+type nexter struct {
+	r   rune
+	err error
+}
+
+// State represents an open terminal
+type State struct {
+	commonState
+	origMode    termios
+	defaultMode termios
+	next        <-chan nexter
+	winch       chan os.Signal
+	pending     []rune
+	useCHA      bool
+}
+
+// NewLiner initializes a new *State, and sets the terminal into raw mode. To
+// restore the terminal to its previous state, call State.Close().
+//
+// Note if you are still using Go 1.0: NewLiner handles SIGWINCH, so it will
+// leak a channel every time you call it. Therefore, it is recommened that you
+// upgrade to a newer release of Go, or ensure that NewLiner is only called
+// once.
+func NewLiner() *State {
+	var s State
+	s.r = bufio.NewReader(os.Stdin)
+
+	s.terminalSupported = TerminalSupported()
+	if m, err := TerminalMode(); err == nil {
+		s.origMode = *m.(*termios)
+	} else {
+		s.inputRedirected = true
+	}
+	if _, err := getMode(syscall.Stdout); err != 0 {
+		s.outputRedirected = true
+	}
+	if s.inputRedirected && s.outputRedirected {
+		s.terminalSupported = false
+	}
+	if s.terminalSupported && !s.inputRedirected && !s.outputRedirected {
+		mode := s.origMode
+		mode.Iflag &^= icrnl | inpck | istrip | ixon
+		mode.Cflag |= cs8
+		mode.Lflag &^= syscall.ECHO | icanon | iexten
+		mode.ApplyMode()
+
+		winch := make(chan os.Signal, 1)
+		signal.Notify(winch, syscall.SIGWINCH)
+		s.winch = winch
+
+		s.checkOutput()
+	}
+
+	if !s.outputRedirected {
+		s.outputRedirected = !s.getColumns()
+	}
+
+	return &s
+}
+
+var errTimedOut = errors.New("timeout")
+
+func (s *State) startPrompt() {
+	if s.terminalSupported {
+		if m, err := TerminalMode(); err == nil {
+			s.defaultMode = *m.(*termios)
+			mode := s.defaultMode
+			mode.Lflag &^= isig
+			mode.ApplyMode()
+		}
+	}
+	s.restartPrompt()
+}
+
+func (s *State) restartPrompt() {
+	next := make(chan nexter)
+	go func() {
+		for {
+			var n nexter
+			n.r, _, n.err = s.r.ReadRune()
+			next <- n
+			// Shut down nexter loop when an end condition has been reached
+			if n.err != nil || n.r == '\n' || n.r == '\r' || n.r == ctrlC || n.r == ctrlD {
+				close(next)
+				return
+			}
+		}
+	}()
+	s.next = next
+}
+
+func (s *State) stopPrompt() {
+	if s.terminalSupported {
+		s.defaultMode.ApplyMode()
+	}
+}
+
+func (s *State) nextPending(timeout <-chan time.Time) (rune, error) {
+	select {
+	case thing, ok := <-s.next:
+		if !ok {
+			return 0, errors.New("liner: internal error")
+		}
+		if thing.err != nil {
+			return 0, thing.err
+		}
+		s.pending = append(s.pending, thing.r)
+		return thing.r, nil
+	case <-timeout:
+		rv := s.pending[0]
+		s.pending = s.pending[1:]
+		return rv, errTimedOut
+	}
+	// not reached
+	return 0, nil
+}
+
+func (s *State) readNext() (interface{}, error) {
+	if len(s.pending) > 0 {
+		rv := s.pending[0]
+		s.pending = s.pending[1:]
+		return rv, nil
+	}
+	var r rune
+	select {
+	case thing, ok := <-s.next:
+		if !ok {
+			return 0, errors.New("liner: internal error")
+		}
+		if thing.err != nil {
+			return nil, thing.err
+		}
+		r = thing.r
+	case <-s.winch:
+		s.getColumns()
+		return winch, nil
+	}
+	if r != esc {
+		return r, nil
+	}
+	s.pending = append(s.pending, r)
+
+	// Wait at most 50 ms for the rest of the escape sequence
+	// If nothing else arrives, it was an actual press of the esc key
+	timeout := time.After(50 * time.Millisecond)
+	flag, err := s.nextPending(timeout)
+	if err != nil {
+		if err == errTimedOut {
+			return flag, nil
+		}
+		return unknown, err
+	}
+
+	switch flag {
+	case '[':
+		code, err := s.nextPending(timeout)
+		if err != nil {
+			if err == errTimedOut {
+				return code, nil
+			}
+			return unknown, err
+		}
+		switch code {
+		case 'A':
+			s.pending = s.pending[:0] // escape code complete
+			return up, nil
+		case 'B':
+			s.pending = s.pending[:0] // escape code complete
+			return down, nil
+		case 'C':
+			s.pending = s.pending[:0] // escape code complete
+			return right, nil
+		case 'D':
+			s.pending = s.pending[:0] // escape code complete
+			return left, nil
+		case 'F':
+			s.pending = s.pending[:0] // escape code complete
+			return end, nil
+		case 'H':
+			s.pending = s.pending[:0] // escape code complete
+			return home, nil
+		case 'Z':
+			s.pending = s.pending[:0] // escape code complete
+			return shiftTab, nil
+		case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
+			num := []rune{code}
+			for {
+				code, err := s.nextPending(timeout)
+				if err != nil {
+					if err == errTimedOut {
+						return code, nil
+					}
+					return nil, err
+				}
+				switch code {
+				case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
+					num = append(num, code)
+				case ';':
+					// Modifier code to follow
+					// This only supports Ctrl-left and Ctrl-right for now
+					x, _ := strconv.ParseInt(string(num), 10, 32)
+					if x != 1 {
+						// Can't be left or right
+						rv := s.pending[0]
+						s.pending = s.pending[1:]
+						return rv, nil
+					}
+					num = num[:0]
+					for {
+						code, err = s.nextPending(timeout)
+						if err != nil {
+							if err == errTimedOut {
+								rv := s.pending[0]
+								s.pending = s.pending[1:]
+								return rv, nil
+							}
+							return nil, err
+						}
+						switch code {
+						case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
+							num = append(num, code)
+						case 'C', 'D':
+							// right, left
+							mod, _ := strconv.ParseInt(string(num), 10, 32)
+							if mod != 5 {
+								// Not bare Ctrl
+								rv := s.pending[0]
+								s.pending = s.pending[1:]
+								return rv, nil
+							}
+							s.pending = s.pending[:0] // escape code complete
+							if code == 'C' {
+								return wordRight, nil
+							}
+							return wordLeft, nil
+						default:
+							// Not left or right
+							rv := s.pending[0]
+							s.pending = s.pending[1:]
+							return rv, nil
+						}
+					}
+				case '~':
+					s.pending = s.pending[:0] // escape code complete
+					x, _ := strconv.ParseInt(string(num), 10, 32)
+					switch x {
+					case 2:
+						return insert, nil
+					case 3:
+						return del, nil
+					case 5:
+						return pageUp, nil
+					case 6:
+						return pageDown, nil
+					case 7:
+						return home, nil
+					case 8:
+						return end, nil
+					case 15:
+						return f5, nil
+					case 17:
+						return f6, nil
+					case 18:
+						return f7, nil
+					case 19:
+						return f8, nil
+					case 20:
+						return f9, nil
+					case 21:
+						return f10, nil
+					case 23:
+						return f11, nil
+					case 24:
+						return f12, nil
+					default:
+						return unknown, nil
+					}
+				default:
+					// unrecognized escape code
+					rv := s.pending[0]
+					s.pending = s.pending[1:]
+					return rv, nil
+				}
+			}
+		}
+
+	case 'O':
+		code, err := s.nextPending(timeout)
+		if err != nil {
+			if err == errTimedOut {
+				return code, nil
+			}
+			return nil, err
+		}
+		s.pending = s.pending[:0] // escape code complete
+		switch code {
+		case 'c':
+			return wordRight, nil
+		case 'd':
+			return wordLeft, nil
+		case 'H':
+			return home, nil
+		case 'F':
+			return end, nil
+		case 'P':
+			return f1, nil
+		case 'Q':
+			return f2, nil
+		case 'R':
+			return f3, nil
+		case 'S':
+			return f4, nil
+		default:
+			return unknown, nil
+		}
+	case 'b':
+		s.pending = s.pending[:0] // escape code complete
+		return altB, nil
+	case 'f':
+		s.pending = s.pending[:0] // escape code complete
+		return altF, nil
+	case 'y':
+		s.pending = s.pending[:0] // escape code complete
+		return altY, nil
+	default:
+		rv := s.pending[0]
+		s.pending = s.pending[1:]
+		return rv, nil
+	}
+
+	// not reached
+	return r, nil
+}
+
+// Close returns the terminal to its previous mode
+func (s *State) Close() error {
+	stopSignal(s.winch)
+	if !s.inputRedirected {
+		s.origMode.ApplyMode()
+	}
+	return nil
+}
+
+// TerminalSupported returns true if the current terminal supports
+// line editing features, and false if liner will use the 'dumb'
+// fallback for input.
+// Note that TerminalSupported does not check all factors that may
+// cause liner to not fully support the terminal (such as stdin redirection)
+func TerminalSupported() bool {
+	bad := map[string]bool{"": true, "dumb": true, "cons25": true}
+	return !bad[strings.ToLower(os.Getenv("TERM"))]
+}

vendor/github.com/peterh/liner/input_darwin.go

@@ -0,0 +1,43 @@
+// +build darwin
+
+package liner
+
+import "syscall"
+
+const (
+	getTermios = syscall.TIOCGETA
+	setTermios = syscall.TIOCSETA
+)
+
+const (
+	// Input flags
+	inpck  = 0x010
+	istrip = 0x020
+	icrnl  = 0x100
+	ixon   = 0x200
+
+	// Output flags
+	opost = 0x1
+
+	// Control flags
+	cs8 = 0x300
+
+	// Local flags
+	isig   = 0x080
+	icanon = 0x100
+	iexten = 0x400
+)
+
+type termios struct {
+	Iflag  uintptr
+	Oflag  uintptr
+	Cflag  uintptr
+	Lflag  uintptr
+	Cc     [20]byte
+	Ispeed uintptr
+	Ospeed uintptr
+}
+
+// Terminal.app needs a column for the cursor when the input line is at the
+// bottom of the window.
+const cursorColumn = true

vendor/github.com/peterh/liner/input_linux.go

@@ -0,0 +1,28 @@
+// +build linux
+
+package liner
+
+import "syscall"
+
+const (
+	getTermios = syscall.TCGETS
+	setTermios = syscall.TCSETS
+)
+
+const (
+	icrnl  = syscall.ICRNL
+	inpck  = syscall.INPCK
+	istrip = syscall.ISTRIP
+	ixon   = syscall.IXON
+	opost  = syscall.OPOST
+	cs8    = syscall.CS8
+	isig   = syscall.ISIG
+	icanon = syscall.ICANON
+	iexten = syscall.IEXTEN
+)
+
+type termios struct {
+	syscall.Termios
+}
+
+const cursorColumn = false

vendor/github.com/peterh/liner/input_windows.go

@@ -0,0 +1,324 @@
+package liner
+
+import (
+	"bufio"
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+var (
+	kernel32 = syscall.NewLazyDLL("kernel32.dll")
+
+	procGetStdHandle               = kernel32.NewProc("GetStdHandle")
+	procReadConsoleInput           = kernel32.NewProc("ReadConsoleInputW")
+	procGetConsoleMode             = kernel32.NewProc("GetConsoleMode")
+	procSetConsoleMode             = kernel32.NewProc("SetConsoleMode")
+	procSetConsoleCursorPosition   = kernel32.NewProc("SetConsoleCursorPosition")
+	procGetConsoleScreenBufferInfo = kernel32.NewProc("GetConsoleScreenBufferInfo")
+	procFillConsoleOutputCharacter = kernel32.NewProc("FillConsoleOutputCharacterW")
+)
+
+// These names are from the Win32 api, so they use underscores (contrary to
+// what golint suggests)
+const (
+	std_input_handle     = uint32(-10 & 0xFFFFFFFF)
+	std_output_handle    = uint32(-11 & 0xFFFFFFFF)
+	std_error_handle     = uint32(-12 & 0xFFFFFFFF)
+	invalid_handle_value = ^uintptr(0)
+)
+
+type inputMode uint32
+
+// State represents an open terminal
+type State struct {
+	commonState
+	handle      syscall.Handle
+	hOut        syscall.Handle
+	origMode    inputMode
+	defaultMode inputMode
+	key         interface{}
+	repeat      uint16
+}
+
+const (
+	enableEchoInput      = 0x4
+	enableInsertMode     = 0x20
+	enableLineInput      = 0x2
+	enableMouseInput     = 0x10
+	enableProcessedInput = 0x1
+	enableQuickEditMode  = 0x40
+	enableWindowInput    = 0x8
+)
+
+// NewLiner initializes a new *State, and sets the terminal into raw mode. To
+// restore the terminal to its previous state, call State.Close().
+func NewLiner() *State {
+	var s State
+	hIn, _, _ := procGetStdHandle.Call(uintptr(std_input_handle))
+	s.handle = syscall.Handle(hIn)
+	hOut, _, _ := procGetStdHandle.Call(uintptr(std_output_handle))
+	s.hOut = syscall.Handle(hOut)
+
+	s.terminalSupported = true
+	if m, err := TerminalMode(); err == nil {
+		s.origMode = m.(inputMode)
+		mode := s.origMode
+		mode &^= enableEchoInput
+		mode &^= enableInsertMode
+		mode &^= enableLineInput
+		mode &^= enableMouseInput
+		mode |= enableWindowInput
+		mode.ApplyMode()
+	} else {
+		s.inputRedirected = true
+		s.r = bufio.NewReader(os.Stdin)
+	}
+
+	s.getColumns()
+	s.outputRedirected = s.columns <= 0
+
+	return &s
+}
+
+// These names are from the Win32 api, so they use underscores (contrary to
+// what golint suggests)
+const (
+	focus_event              = 0x0010
+	key_event                = 0x0001
+	menu_event               = 0x0008
+	mouse_event              = 0x0002
+	window_buffer_size_event = 0x0004
+)
+
+type input_record struct {
+	eventType uint16
+	pad       uint16
+	blob      [16]byte
+}
+
+type key_event_record struct {
+	KeyDown         int32
+	RepeatCount     uint16
+	VirtualKeyCode  uint16
+	VirtualScanCode uint16
+	Char            int16
+	ControlKeyState uint32
+}
+
+// These names are from the Win32 api, so they use underscores (contrary to
+// what golint suggests)
+const (
+	vk_tab    = 0x09
+	vk_prior  = 0x21
+	vk_next   = 0x22
+	vk_end    = 0x23
+	vk_home   = 0x24
+	vk_left   = 0x25
+	vk_up     = 0x26
+	vk_right  = 0x27
+	vk_down   = 0x28
+	vk_insert = 0x2d
+	vk_delete = 0x2e
+	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
+	bKey      = 0x42
+	fKey      = 0x46
+	yKey      = 0x59
+)
+
+const (
+	shiftPressed     = 0x0010
+	leftAltPressed   = 0x0002
+	leftCtrlPressed  = 0x0008
+	rightAltPressed  = 0x0001
+	rightCtrlPressed = 0x0004
+
+	modKeys = shiftPressed | leftAltPressed | rightAltPressed | leftCtrlPressed | rightCtrlPressed
+)
+
+func (s *State) readNext() (interface{}, error) {
+	if s.repeat > 0 {
+		s.repeat--
+		return s.key, nil
+	}
+
+	var input input_record
+	pbuf := uintptr(unsafe.Pointer(&input))
+	var rv uint32
+	prv := uintptr(unsafe.Pointer(&rv))
+
+	for {
+		ok, _, err := procReadConsoleInput.Call(uintptr(s.handle), pbuf, 1, prv)
+
+		if ok == 0 {
+			return nil, err
+		}
+
+		if input.eventType == window_buffer_size_event {
+			xy := (*coord)(unsafe.Pointer(&input.blob[0]))
+			s.columns = int(xy.x)
+			if s.columns > 1 {
+				s.columns--
+			}
+			return winch, nil
+		}
+		if input.eventType != key_event {
+			continue
+		}
+		ke := (*key_event_record)(unsafe.Pointer(&input.blob[0]))
+		if ke.KeyDown == 0 {
+			continue
+		}
+
+		if ke.VirtualKeyCode == vk_tab && ke.ControlKeyState&modKeys == shiftPressed {
+			s.key = shiftTab
+		} else if ke.VirtualKeyCode == bKey && (ke.ControlKeyState&modKeys == leftAltPressed ||
+			ke.ControlKeyState&modKeys == rightAltPressed) {
+			s.key = altB
+		} else if ke.VirtualKeyCode == fKey && (ke.ControlKeyState&modKeys == leftAltPressed ||
+			ke.ControlKeyState&modKeys == rightAltPressed) {
+			s.key = altF
+		} else if ke.VirtualKeyCode == yKey && (ke.ControlKeyState&modKeys == leftAltPressed ||
+			ke.ControlKeyState&modKeys == rightAltPressed) {
+			s.key = altY
+		} else if ke.Char > 0 {
+			s.key = rune(ke.Char)
+		} else {
+			switch ke.VirtualKeyCode {
+			case vk_prior:
+				s.key = pageUp
+			case vk_next:
+				s.key = pageDown
+			case vk_end:
+				s.key = end
+			case vk_home:
+				s.key = home
+			case vk_left:
+				s.key = left
+				if ke.ControlKeyState&(leftCtrlPressed|rightCtrlPressed) != 0 {
+					if ke.ControlKeyState&modKeys == ke.ControlKeyState&(leftCtrlPressed|rightCtrlPressed) {
+						s.key = wordLeft
+					}
+				}
+			case vk_right:
+				s.key = right
+				if ke.ControlKeyState&(leftCtrlPressed|rightCtrlPressed) != 0 {
+					if ke.ControlKeyState&modKeys == ke.ControlKeyState&(leftCtrlPressed|rightCtrlPressed) {
+						s.key = wordRight
+					}
+				}
+			case vk_up:
+				s.key = up
+			case vk_down:
+				s.key = down
+			case vk_insert:
+				s.key = insert
+			case vk_delete:
+				s.key = del
+			case vk_f1:
+				s.key = f1
+			case vk_f2:
+				s.key = f2
+			case vk_f3:
+				s.key = f3
+			case vk_f4:
+				s.key = f4
+			case vk_f5:
+				s.key = f5
+			case vk_f6:
+				s.key = f6
+			case vk_f7:
+				s.key = f7
+			case vk_f8:
+				s.key = f8
+			case vk_f9:
+				s.key = f9
+			case vk_f10:
+				s.key = f10
+			case vk_f11:
+				s.key = f11
+			case vk_f12:
+				s.key = f12
+			default:
+				// Eat modifier keys
+				// TODO: return Action(Unknown) if the key isn't a
+				// modifier.
+				continue
+			}
+		}
+
+		if ke.RepeatCount > 1 {
+			s.repeat = ke.RepeatCount - 1
+		}
+		return s.key, nil
+	}
+	return unknown, nil
+}
+
+// Close returns the terminal to its previous mode
+func (s *State) Close() error {
+	s.origMode.ApplyMode()
+	return nil
+}
+
+func (s *State) startPrompt() {
+	if m, err := TerminalMode(); err == nil {
+		s.defaultMode = m.(inputMode)
+		mode := s.defaultMode
+		mode &^= enableProcessedInput
+		mode.ApplyMode()
+	}
+}
+
+func (s *State) restartPrompt() {
+}
+
+func (s *State) stopPrompt() {
+	s.defaultMode.ApplyMode()
+}
+
+// TerminalSupported returns true because line editing is always
+// supported on Windows.
+func TerminalSupported() bool {
+	return true
+}
+
+func (mode inputMode) ApplyMode() error {
+	hIn, _, err := procGetStdHandle.Call(uintptr(std_input_handle))
+	if hIn == invalid_handle_value || hIn == 0 {
+		return err
+	}
+	ok, _, err := procSetConsoleMode.Call(hIn, uintptr(mode))
+	if ok != 0 {
+		err = nil
+	}
+	return err
+}
+
+// TerminalMode returns the current terminal input mode as an InputModeSetter.
+//
+// This function is provided for convenience, and should
+// not be necessary for most users of liner.
+func TerminalMode() (ModeApplier, error) {
+	var mode inputMode
+	hIn, _, err := procGetStdHandle.Call(uintptr(std_input_handle))
+	if hIn == invalid_handle_value || hIn == 0 {
+		return nil, err
+	}
+	ok, _, err := procGetConsoleMode.Call(hIn, uintptr(unsafe.Pointer(&mode)))
+	if ok != 0 {
+		err = nil
+	}
+	return mode, err
+}

vendor/github.com/peterh/liner/output.go

@@ -0,0 +1,79 @@
+// +build linux darwin openbsd freebsd netbsd
+
+package liner
+
+import (
+	"fmt"
+	"os"
+	"strings"
+	"syscall"
+	"unsafe"
+)
+
+func (s *State) cursorPos(x int) {
+	if s.useCHA {
+		// 'G' is "Cursor Character Absolute (CHA)"
+		fmt.Printf("\x1b[%dG", x+1)
+	} else {
+		// 'C' is "Cursor Forward (CUF)"
+		fmt.Print("\r")
+		if x > 0 {
+			fmt.Printf("\x1b[%dC", x)
+		}
+	}
+}
+
+func (s *State) eraseLine() {
+	fmt.Print("\x1b[0K")
+}
+
+func (s *State) eraseScreen() {
+	fmt.Print("\x1b[H\x1b[2J")
+}
+
+func (s *State) moveUp(lines int) {
+	fmt.Printf("\x1b[%dA", lines)
+}
+
+func (s *State) moveDown(lines int) {
+	fmt.Printf("\x1b[%dB", lines)
+}
+
+func (s *State) emitNewLine() {
+	fmt.Print("\n")
+}
+
+type winSize struct {
+	row, col       uint16
+	xpixel, ypixel uint16
+}
+
+func (s *State) getColumns() bool {
+	var ws winSize
+	ok, _, _ := syscall.Syscall(syscall.SYS_IOCTL, uintptr(syscall.Stdout),
+		syscall.TIOCGWINSZ, uintptr(unsafe.Pointer(&ws)))
+	if int(ok) < 0 {
+		return false
+	}
+	s.columns = int(ws.col)
+	if cursorColumn && s.columns > 1 {
+		s.columns--
+	}
+	return true
+}
+
+func (s *State) checkOutput() {
+	// xterm is known to support CHA
+	if strings.Contains(strings.ToLower(os.Getenv("TERM")), "xterm") {
+		s.useCHA = true
+		return
+	}
+
+	// The test for functional ANSI CHA is unreliable (eg the Windows
+	// telnet command does not support reading the cursor position with
+	// an ANSI DSR request, despite setting TERM=ansi)
+
+	// Assume CHA isn't supported (which should be safe, although it
+	// does result in occasional visible cursor jitter)
+	s.useCHA = false
+}

vendor/github.com/peterh/liner/output_windows.go

@@ -0,0 +1,76 @@
+package liner
+
+import (
+	"unsafe"
+)
+
+type coord struct {
+	x, y int16
+}
+type smallRect struct {
+	left, top, right, bottom int16
+}
+
+type consoleScreenBufferInfo struct {
+	dwSize              coord
+	dwCursorPosition    coord
+	wAttributes         int16
+	srWindow            smallRect
+	dwMaximumWindowSize coord
+}
+
+func (s *State) cursorPos(x int) {
+	var sbi consoleScreenBufferInfo
+	procGetConsoleScreenBufferInfo.Call(uintptr(s.hOut), uintptr(unsafe.Pointer(&sbi)))
+	procSetConsoleCursorPosition.Call(uintptr(s.hOut),
+		uintptr(int(x)&0xFFFF|int(sbi.dwCursorPosition.y)<<16))
+}
+
+func (s *State) eraseLine() {
+	var sbi consoleScreenBufferInfo
+	procGetConsoleScreenBufferInfo.Call(uintptr(s.hOut), uintptr(unsafe.Pointer(&sbi)))
+	var numWritten uint32
+	procFillConsoleOutputCharacter.Call(uintptr(s.hOut), uintptr(' '),
+		uintptr(sbi.dwSize.x-sbi.dwCursorPosition.x),
+		uintptr(int(sbi.dwCursorPosition.x)&0xFFFF|int(sbi.dwCursorPosition.y)<<16),
+		uintptr(unsafe.Pointer(&numWritten)))
+}
+
+func (s *State) eraseScreen() {
+	var sbi consoleScreenBufferInfo
+	procGetConsoleScreenBufferInfo.Call(uintptr(s.hOut), uintptr(unsafe.Pointer(&sbi)))
+	var numWritten uint32
+	procFillConsoleOutputCharacter.Call(uintptr(s.hOut), uintptr(' '),
+		uintptr(sbi.dwSize.x)*uintptr(sbi.dwSize.y),
+		0,
+		uintptr(unsafe.Pointer(&numWritten)))
+	procSetConsoleCursorPosition.Call(uintptr(s.hOut), 0)
+}
+
+func (s *State) moveUp(lines int) {
+	var sbi consoleScreenBufferInfo
+	procGetConsoleScreenBufferInfo.Call(uintptr(s.hOut), uintptr(unsafe.Pointer(&sbi)))
+	procSetConsoleCursorPosition.Call(uintptr(s.hOut),
+		uintptr(int(sbi.dwCursorPosition.x)&0xFFFF|(int(sbi.dwCursorPosition.y)-lines)<<16))
+}
+
+func (s *State) moveDown(lines int) {
+	var sbi consoleScreenBufferInfo
+	procGetConsoleScreenBufferInfo.Call(uintptr(s.hOut), uintptr(unsafe.Pointer(&sbi)))
+	procSetConsoleCursorPosition.Call(uintptr(s.hOut),
+		uintptr(int(sbi.dwCursorPosition.x)&0xFFFF|(int(sbi.dwCursorPosition.y)+lines)<<16))
+}
+
+func (s *State) emitNewLine() {
+	// windows doesn't need to omit a new line
+}
+
+func (s *State) getColumns() {
+	var sbi consoleScreenBufferInfo
+	procGetConsoleScreenBufferInfo.Call(uintptr(s.hOut), uintptr(unsafe.Pointer(&sbi)))
+	s.columns = int(sbi.dwSize.x)
+	if s.columns > 1 {
+		// Windows 10 needs a spare column for the cursor
+		s.columns--
+	}
+}

vendor/github.com/peterh/liner/signal.go

@@ -0,0 +1,12 @@
+// +build go1.1,!windows
+
+package liner
+
+import (
+	"os"
+	"os/signal"
+)
+
+func stopSignal(c chan<- os.Signal) {
+	signal.Stop(c)
+}

vendor/github.com/peterh/liner/signal_legacy.go

@@ -0,0 +1,11 @@
+// +build !go1.1,!windows
+
+package liner
+
+import (
+	"os"
+)
+
+func stopSignal(c chan<- os.Signal) {
+	// signal.Stop does not exist before Go 1.1
+}

vendor/github.com/peterh/liner/unixmode.go

@@ -0,0 +1,37 @@
+// +build linux darwin freebsd openbsd netbsd
+
+package liner
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+func (mode *termios) ApplyMode() error {
+	_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, uintptr(syscall.Stdin), setTermios, uintptr(unsafe.Pointer(mode)))
+
+	if errno != 0 {
+		return errno
+	}
+	return nil
+}
+
+// TerminalMode returns the current terminal input mode as an InputModeSetter.
+//
+// This function is provided for convenience, and should
+// not be necessary for most users of liner.
+func TerminalMode() (ModeApplier, error) {
+	mode, errno := getMode(syscall.Stdin)
+
+	if errno != 0 {
+		return nil, errno
+	}
+	return mode, nil
+}
+
+func getMode(handle int) (*termios, syscall.Errno) {
+	var mode termios
+	_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, uintptr(handle), getTermios, uintptr(unsafe.Pointer(&mode)))
+
+	return &mode, errno
+}

vendor/github.com/peterh/liner/width.go

@@ -0,0 +1,79 @@
+package liner
+
+import "unicode"
+
+// These character classes are mostly zero width (when combined).
+// A few might not be, depending on the user's font. Fixing this
+// is non-trivial, given that some terminals don't support
+// ANSI DSR/CPR
+var zeroWidth = []*unicode.RangeTable{
+	unicode.Mn,
+	unicode.Me,
+	unicode.Cc,
+	unicode.Cf,
+}
+
+var doubleWidth = []*unicode.RangeTable{
+	unicode.Han,
+	unicode.Hangul,
+	unicode.Hiragana,
+	unicode.Katakana,
+}
+
+// countGlyphs considers zero-width characters to be zero glyphs wide,
+// and members of Chinese, Japanese, and Korean scripts to be 2 glyphs wide.
+func countGlyphs(s []rune) int {
+	n := 0
+	for _, r := range s {
+		switch {
+		case unicode.IsOneOf(zeroWidth, r):
+		case unicode.IsOneOf(doubleWidth, r):
+			n += 2
+		default:
+			n++
+		}
+	}
+	return n
+}
+
+func countMultiLineGlyphs(s []rune, columns int, start int) int {
+	n := start
+	for _, r := range s {
+		switch {
+		case unicode.IsOneOf(zeroWidth, r):
+		case unicode.IsOneOf(doubleWidth, r):
+			n += 2
+			// no room for a 2-glyphs-wide char in the ending
+			// so skip a column and display it at the beginning
+			if n%columns == 1 {
+				n++
+			}
+		default:
+			n++
+		}
+	}
+	return n
+}
+
+func getPrefixGlyphs(s []rune, num int) []rune {
+	p := 0
+	for n := 0; n < num && p < len(s); p++ {
+		if !unicode.IsOneOf(zeroWidth, s[p]) {
+			n++
+		}
+	}
+	for p < len(s) && unicode.IsOneOf(zeroWidth, s[p]) {
+		p++
+	}
+	return s[:p]
+}
+
+func getSuffixGlyphs(s []rune, num int) []rune {
+	p := len(s)
+	for n := 0; n < num && p > 0; p-- {
+		if !unicode.IsOneOf(zeroWidth, s[p-1]) {
+			n++
+		}
+	}
+	return s[p:]
+}