mirror of
https://github.com/golang/go
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exp/terminal: delete.
This is now known as code.google.com/p/go.crypto/ssh/terminal. R=golang-dev, r CC=golang-dev https://golang.org/cl/5970044
This commit is contained in:
David Symonds
parent
efb134f8bf
commit
dc640ebd1a
@ -1,520 +0,0 @@
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package terminal
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import (
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"io"
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"sync"
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)
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// EscapeCodes contains escape sequences that can be written to the terminal in
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// order to achieve different styles of text.
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type EscapeCodes struct {
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// Foreground colors
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Black, Red, Green, Yellow, Blue, Magenta, Cyan, White []byte
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// Reset all attributes
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Reset []byte
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}
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var vt100EscapeCodes = EscapeCodes{
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Black: []byte{keyEscape, '[', '3', '0', 'm'},
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Red: []byte{keyEscape, '[', '3', '1', 'm'},
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Green: []byte{keyEscape, '[', '3', '2', 'm'},
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Yellow: []byte{keyEscape, '[', '3', '3', 'm'},
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Blue: []byte{keyEscape, '[', '3', '4', 'm'},
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Magenta: []byte{keyEscape, '[', '3', '5', 'm'},
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Cyan: []byte{keyEscape, '[', '3', '6', 'm'},
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White: []byte{keyEscape, '[', '3', '7', 'm'},
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Reset: []byte{keyEscape, '[', '0', 'm'},
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}
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// Terminal contains the state for running a VT100 terminal that is capable of
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// reading lines of input.
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type Terminal struct {
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// AutoCompleteCallback, if non-null, is called for each keypress
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// with the full input line and the current position of the cursor.
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// If it returns a nil newLine, the key press is processed normally.
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// Otherwise it returns a replacement line and the new cursor position.
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AutoCompleteCallback func(line []byte, pos, key int) (newLine []byte, newPos int)
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// Escape contains a pointer to the escape codes for this terminal.
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// It's always a valid pointer, although the escape codes themselves
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// may be empty if the terminal doesn't support them.
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Escape *EscapeCodes
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// lock protects the terminal and the state in this object from
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// concurrent processing of a key press and a Write() call.
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lock sync.Mutex
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c io.ReadWriter
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prompt string
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// line is the current line being entered.
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line []byte
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// pos is the logical position of the cursor in line
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pos int
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// echo is true if local echo is enabled
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echo bool
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// cursorX contains the current X value of the cursor where the left
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// edge is 0. cursorY contains the row number where the first row of
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// the current line is 0.
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cursorX, cursorY int
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// maxLine is the greatest value of cursorY so far.
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maxLine int
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termWidth, termHeight int
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// outBuf contains the terminal data to be sent.
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outBuf []byte
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// remainder contains the remainder of any partial key sequences after
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// a read. It aliases into inBuf.
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remainder []byte
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inBuf [256]byte
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}
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// NewTerminal runs a VT100 terminal on the given ReadWriter. If the ReadWriter is
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// a local terminal, that terminal must first have been put into raw mode.
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// prompt is a string that is written at the start of each input line (i.e.
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// "> ").
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func NewTerminal(c io.ReadWriter, prompt string) *Terminal {
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return &Terminal{
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Escape: &vt100EscapeCodes,
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c: c,
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prompt: prompt,
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termWidth: 80,
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termHeight: 24,
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echo: true,
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}
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}
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const (
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keyCtrlD = 4
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keyEnter = '\r'
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keyEscape = 27
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keyBackspace = 127
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keyUnknown = 256 + iota
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keyUp
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keyDown
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keyLeft
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keyRight
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keyAltLeft
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keyAltRight
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)
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// bytesToKey tries to parse a key sequence from b. If successful, it returns
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// the key and the remainder of the input. Otherwise it returns -1.
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func bytesToKey(b []byte) (int, []byte) {
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if len(b) == 0 {
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return -1, nil
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}
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if b[0] != keyEscape {
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return int(b[0]), b[1:]
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}
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if len(b) >= 3 && b[0] == keyEscape && b[1] == '[' {
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switch b[2] {
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case 'A':
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return keyUp, b[3:]
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case 'B':
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return keyDown, b[3:]
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case 'C':
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return keyRight, b[3:]
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case 'D':
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return keyLeft, b[3:]
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}
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}
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if len(b) >= 6 && b[0] == keyEscape && b[1] == '[' && b[2] == '1' && b[3] == ';' && b[4] == '3' {
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switch b[5] {
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case 'C':
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return keyAltRight, b[6:]
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case 'D':
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return keyAltLeft, b[6:]
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}
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}
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// If we get here then we have a key that we don't recognise, or a
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// partial sequence. It's not clear how one should find the end of a
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// sequence without knowing them all, but it seems that [a-zA-Z] only
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// appears at the end of a sequence.
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for i, c := range b[0:] {
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if c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' {
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return keyUnknown, b[i+1:]
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}
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}
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return -1, b
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}
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// queue appends data to the end of t.outBuf
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func (t *Terminal) queue(data []byte) {
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t.outBuf = append(t.outBuf, data...)
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}
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var eraseUnderCursor = []byte{' ', keyEscape, '[', 'D'}
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var space = []byte{' '}
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func isPrintable(key int) bool {
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return key >= 32 && key < 127
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}
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// moveCursorToPos appends data to t.outBuf which will move the cursor to the
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// given, logical position in the text.
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func (t *Terminal) moveCursorToPos(pos int) {
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if !t.echo {
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return
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}
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x := len(t.prompt) + pos
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y := x / t.termWidth
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x = x % t.termWidth
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up := 0
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if y < t.cursorY {
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up = t.cursorY - y
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}
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down := 0
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if y > t.cursorY {
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down = y - t.cursorY
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}
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left := 0
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if x < t.cursorX {
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left = t.cursorX - x
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}
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right := 0
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if x > t.cursorX {
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right = x - t.cursorX
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}
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t.cursorX = x
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t.cursorY = y
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t.move(up, down, left, right)
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}
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func (t *Terminal) move(up, down, left, right int) {
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movement := make([]byte, 3*(up+down+left+right))
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m := movement
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for i := 0; i < up; i++ {
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m[0] = keyEscape
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m[1] = '['
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m[2] = 'A'
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m = m[3:]
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}
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for i := 0; i < down; i++ {
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m[0] = keyEscape
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m[1] = '['
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m[2] = 'B'
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m = m[3:]
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}
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for i := 0; i < left; i++ {
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m[0] = keyEscape
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m[1] = '['
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m[2] = 'D'
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m = m[3:]
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}
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for i := 0; i < right; i++ {
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m[0] = keyEscape
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m[1] = '['
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m[2] = 'C'
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m = m[3:]
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}
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t.queue(movement)
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}
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func (t *Terminal) clearLineToRight() {
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op := []byte{keyEscape, '[', 'K'}
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t.queue(op)
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}
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const maxLineLength = 4096
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// handleKey processes the given key and, optionally, returns a line of text
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// that the user has entered.
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func (t *Terminal) handleKey(key int) (line string, ok bool) {
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switch key {
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case keyBackspace:
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if t.pos == 0 {
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return
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}
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t.pos--
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t.moveCursorToPos(t.pos)
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copy(t.line[t.pos:], t.line[1+t.pos:])
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t.line = t.line[:len(t.line)-1]
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if t.echo {
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t.writeLine(t.line[t.pos:])
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}
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t.queue(eraseUnderCursor)
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t.moveCursorToPos(t.pos)
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case keyAltLeft:
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// move left by a word.
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if t.pos == 0 {
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return
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}
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t.pos--
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for t.pos > 0 {
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if t.line[t.pos] != ' ' {
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break
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}
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t.pos--
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}
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for t.pos > 0 {
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if t.line[t.pos] == ' ' {
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t.pos++
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break
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}
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t.pos--
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}
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t.moveCursorToPos(t.pos)
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case keyAltRight:
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// move right by a word.
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for t.pos < len(t.line) {
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if t.line[t.pos] == ' ' {
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break
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}
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t.pos++
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}
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for t.pos < len(t.line) {
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if t.line[t.pos] != ' ' {
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break
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}
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t.pos++
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}
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t.moveCursorToPos(t.pos)
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case keyLeft:
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if t.pos == 0 {
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return
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}
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t.pos--
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t.moveCursorToPos(t.pos)
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case keyRight:
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if t.pos == len(t.line) {
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return
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}
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t.pos++
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t.moveCursorToPos(t.pos)
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case keyEnter:
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t.moveCursorToPos(len(t.line))
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t.queue([]byte("\r\n"))
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line = string(t.line)
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ok = true
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t.line = t.line[:0]
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t.pos = 0
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t.cursorX = 0
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t.cursorY = 0
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t.maxLine = 0
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default:
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if t.AutoCompleteCallback != nil {
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t.lock.Unlock()
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newLine, newPos := t.AutoCompleteCallback(t.line, t.pos, key)
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t.lock.Lock()
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if newLine != nil {
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if t.echo {
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t.moveCursorToPos(0)
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t.writeLine(newLine)
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for i := len(newLine); i < len(t.line); i++ {
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t.writeLine(space)
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}
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t.moveCursorToPos(newPos)
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}
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t.line = newLine
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t.pos = newPos
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return
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}
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}
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if !isPrintable(key) {
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return
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}
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if len(t.line) == maxLineLength {
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return
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}
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if len(t.line) == cap(t.line) {
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newLine := make([]byte, len(t.line), 2*(1+len(t.line)))
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copy(newLine, t.line)
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t.line = newLine
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}
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t.line = t.line[:len(t.line)+1]
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copy(t.line[t.pos+1:], t.line[t.pos:])
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t.line[t.pos] = byte(key)
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if t.echo {
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t.writeLine(t.line[t.pos:])
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}
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t.pos++
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t.moveCursorToPos(t.pos)
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}
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return
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}
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func (t *Terminal) writeLine(line []byte) {
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for len(line) != 0 {
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remainingOnLine := t.termWidth - t.cursorX
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todo := len(line)
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if todo > remainingOnLine {
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todo = remainingOnLine
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}
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t.queue(line[:todo])
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t.cursorX += todo
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line = line[todo:]
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if t.cursorX == t.termWidth {
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t.cursorX = 0
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t.cursorY++
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if t.cursorY > t.maxLine {
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t.maxLine = t.cursorY
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}
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}
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}
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}
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func (t *Terminal) Write(buf []byte) (n int, err error) {
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t.lock.Lock()
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defer t.lock.Unlock()
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if t.cursorX == 0 && t.cursorY == 0 {
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// This is the easy case: there's nothing on the screen that we
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// have to move out of the way.
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return t.c.Write(buf)
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}
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// We have a prompt and possibly user input on the screen. We
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// have to clear it first.
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t.move(0 /* up */, 0 /* down */, t.cursorX /* left */, 0 /* right */)
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t.cursorX = 0
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t.clearLineToRight()
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for t.cursorY > 0 {
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t.move(1 /* up */, 0, 0, 0)
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t.cursorY--
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t.clearLineToRight()
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}
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if _, err = t.c.Write(t.outBuf); err != nil {
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return
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}
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t.outBuf = t.outBuf[:0]
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if n, err = t.c.Write(buf); err != nil {
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return
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}
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t.queue([]byte(t.prompt))
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chars := len(t.prompt)
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if t.echo {
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t.queue(t.line)
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chars += len(t.line)
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}
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t.cursorX = chars % t.termWidth
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t.cursorY = chars / t.termWidth
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t.moveCursorToPos(t.pos)
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if _, err = t.c.Write(t.outBuf); err != nil {
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return
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}
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t.outBuf = t.outBuf[:0]
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return
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}
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// ReadPassword temporarily changes the prompt and reads a password, without
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// echo, from the terminal.
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func (t *Terminal) ReadPassword(prompt string) (line string, err error) {
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t.lock.Lock()
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defer t.lock.Unlock()
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oldPrompt := t.prompt
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t.prompt = prompt
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t.echo = false
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line, err = t.readLine()
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t.prompt = oldPrompt
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t.echo = true
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return
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}
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|
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// ReadLine returns a line of input from the terminal.
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func (t *Terminal) ReadLine() (line string, err error) {
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t.lock.Lock()
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defer t.lock.Unlock()
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return t.readLine()
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}
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|
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func (t *Terminal) readLine() (line string, err error) {
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// t.lock must be held at this point
|
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|
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if t.cursorX == 0 && t.cursorY == 0 {
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t.writeLine([]byte(t.prompt))
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t.c.Write(t.outBuf)
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t.outBuf = t.outBuf[:0]
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}
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for {
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rest := t.remainder
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lineOk := false
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for !lineOk {
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var key int
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key, rest = bytesToKey(rest)
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if key < 0 {
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break
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}
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if key == keyCtrlD {
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return "", io.EOF
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}
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line, lineOk = t.handleKey(key)
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}
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if len(rest) > 0 {
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n := copy(t.inBuf[:], rest)
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t.remainder = t.inBuf[:n]
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||||
} else {
|
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t.remainder = nil
|
||||
}
|
||||
t.c.Write(t.outBuf)
|
||||
t.outBuf = t.outBuf[:0]
|
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if lineOk {
|
||||
return
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}
|
||||
|
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// t.remainder is a slice at the beginning of t.inBuf
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// containing a partial key sequence
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||||
readBuf := t.inBuf[len(t.remainder):]
|
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var n int
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|
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t.lock.Unlock()
|
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n, err = t.c.Read(readBuf)
|
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t.lock.Lock()
|
||||
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
t.remainder = t.inBuf[:n+len(t.remainder)]
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}
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panic("unreachable")
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||||
}
|
||||
|
||||
// SetPrompt sets the prompt to be used when reading subsequent lines.
|
||||
func (t *Terminal) SetPrompt(prompt string) {
|
||||
t.lock.Lock()
|
||||
defer t.lock.Unlock()
|
||||
|
||||
t.prompt = prompt
|
||||
}
|
||||
|
||||
func (t *Terminal) SetSize(width, height int) {
|
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t.lock.Lock()
|
||||
defer t.lock.Unlock()
|
||||
|
||||
t.termWidth, t.termHeight = width, height
|
||||
}
|
||||
@ -1,110 +0,0 @@
|
||||
// Copyright 2011 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package terminal
|
||||
|
||||
import (
|
||||
"io"
|
||||
"testing"
|
||||
)
|
||||
|
||||
type MockTerminal struct {
|
||||
toSend []byte
|
||||
bytesPerRead int
|
||||
received []byte
|
||||
}
|
||||
|
||||
func (c *MockTerminal) Read(data []byte) (n int, err error) {
|
||||
n = len(data)
|
||||
if n == 0 {
|
||||
return
|
||||
}
|
||||
if n > len(c.toSend) {
|
||||
n = len(c.toSend)
|
||||
}
|
||||
if n == 0 {
|
||||
return 0, io.EOF
|
||||
}
|
||||
if c.bytesPerRead > 0 && n > c.bytesPerRead {
|
||||
n = c.bytesPerRead
|
||||
}
|
||||
copy(data, c.toSend[:n])
|
||||
c.toSend = c.toSend[n:]
|
||||
return
|
||||
}
|
||||
|
||||
func (c *MockTerminal) Write(data []byte) (n int, err error) {
|
||||
c.received = append(c.received, data...)
|
||||
return len(data), nil
|
||||
}
|
||||
|
||||
func TestClose(t *testing.T) {
|
||||
c := &MockTerminal{}
|
||||
ss := NewTerminal(c, "> ")
|
||||
line, err := ss.ReadLine()
|
||||
if line != "" {
|
||||
t.Errorf("Expected empty line but got: %s", line)
|
||||
}
|
||||
if err != io.EOF {
|
||||
t.Errorf("Error should have been EOF but got: %s", err)
|
||||
}
|
||||
}
|
||||
|
||||
var keyPressTests = []struct {
|
||||
in string
|
||||
line string
|
||||
err error
|
||||
}{
|
||||
{
|
||||
"",
|
||||
"",
|
||||
io.EOF,
|
||||
},
|
||||
{
|
||||
"\r",
|
||||
"",
|
||||
nil,
|
||||
},
|
||||
{
|
||||
"foo\r",
|
||||
"foo",
|
||||
nil,
|
||||
},
|
||||
{
|
||||
"a\x1b[Cb\r", // right
|
||||
"ab",
|
||||
nil,
|
||||
},
|
||||
{
|
||||
"a\x1b[Db\r", // left
|
||||
"ba",
|
||||
nil,
|
||||
},
|
||||
{
|
||||
"a\177b\r", // backspace
|
||||
"b",
|
||||
nil,
|
||||
},
|
||||
}
|
||||
|
||||
func TestKeyPresses(t *testing.T) {
|
||||
for i, test := range keyPressTests {
|
||||
for j := 0; j < len(test.in); j++ {
|
||||
c := &MockTerminal{
|
||||
toSend: []byte(test.in),
|
||||
bytesPerRead: j,
|
||||
}
|
||||
ss := NewTerminal(c, "> ")
|
||||
line, err := ss.ReadLine()
|
||||
if line != test.line {
|
||||
t.Errorf("Line resulting from test %d (%d bytes per read) was '%s', expected '%s'", i, j, line, test.line)
|
||||
break
|
||||
}
|
||||
if err != test.err {
|
||||
t.Errorf("Error resulting from test %d (%d bytes per read) was '%v', expected '%v'", i, j, err, test.err)
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -1,115 +0,0 @@
|
||||
// Copyright 2011 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build linux
|
||||
|
||||
// Package terminal provides support functions for dealing with terminals, as
|
||||
// commonly found on UNIX systems.
|
||||
//
|
||||
// Putting a terminal into raw mode is the most common requirement:
|
||||
//
|
||||
// oldState, err := terminal.MakeRaw(0)
|
||||
// if err != nil {
|
||||
// panic(err)
|
||||
// }
|
||||
// defer terminal.Restore(0, oldState)
|
||||
package terminal
|
||||
|
||||
import (
|
||||
"io"
|
||||
"syscall"
|
||||
"unsafe"
|
||||
)
|
||||
|
||||
// State contains the state of a terminal.
|
||||
type State struct {
|
||||
termios syscall.Termios
|
||||
}
|
||||
|
||||
// IsTerminal returns true if the given file descriptor is a terminal.
|
||||
func IsTerminal(fd int) bool {
|
||||
var termios syscall.Termios
|
||||
_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCGETS), uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
|
||||
return err == 0
|
||||
}
|
||||
|
||||
// MakeRaw put the terminal connected to the given file descriptor into raw
|
||||
// mode and returns the previous state of the terminal so that it can be
|
||||
// restored.
|
||||
func MakeRaw(fd int) (*State, error) {
|
||||
var oldState State
|
||||
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCGETS), uintptr(unsafe.Pointer(&oldState.termios)), 0, 0, 0); err != 0 {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
newState := oldState.termios
|
||||
newState.Iflag &^= syscall.ISTRIP | syscall.INLCR | syscall.ICRNL | syscall.IGNCR | syscall.IXON | syscall.IXOFF
|
||||
newState.Lflag &^= syscall.ECHO | syscall.ICANON | syscall.ISIG
|
||||
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCSETS), uintptr(unsafe.Pointer(&newState)), 0, 0, 0); err != 0 {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return &oldState, nil
|
||||
}
|
||||
|
||||
// Restore restores the terminal connected to the given file descriptor to a
|
||||
// previous state.
|
||||
func Restore(fd int, state *State) error {
|
||||
_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCSETS), uintptr(unsafe.Pointer(&state.termios)), 0, 0, 0)
|
||||
return err
|
||||
}
|
||||
|
||||
// GetSize returns the dimensions of the given terminal.
|
||||
func GetSize(fd int) (width, height int, err error) {
|
||||
var dimensions [4]uint16
|
||||
|
||||
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(&dimensions)), 0, 0, 0); err != 0 {
|
||||
return -1, -1, err
|
||||
}
|
||||
return int(dimensions[1]), int(dimensions[0]), nil
|
||||
}
|
||||
|
||||
// ReadPassword reads a line of input from a terminal without local echo. This
|
||||
// is commonly used for inputting passwords and other sensitive data. The slice
|
||||
// returned does not include the \n.
|
||||
func ReadPassword(fd int) ([]byte, error) {
|
||||
var oldState syscall.Termios
|
||||
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCGETS), uintptr(unsafe.Pointer(&oldState)), 0, 0, 0); err != 0 {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
newState := oldState
|
||||
newState.Lflag &^= syscall.ECHO
|
||||
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCSETS), uintptr(unsafe.Pointer(&newState)), 0, 0, 0); err != 0 {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
defer func() {
|
||||
syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCSETS), uintptr(unsafe.Pointer(&oldState)), 0, 0, 0)
|
||||
}()
|
||||
|
||||
var buf [16]byte
|
||||
var ret []byte
|
||||
for {
|
||||
n, err := syscall.Read(fd, buf[:])
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if n == 0 {
|
||||
if len(ret) == 0 {
|
||||
return nil, io.EOF
|
||||
}
|
||||
break
|
||||
}
|
||||
if buf[n-1] == '\n' {
|
||||
n--
|
||||
}
|
||||
ret = append(ret, buf[:n]...)
|
||||
if n < len(buf) {
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
return ret, nil
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user