readline

package
v0.3.0 Latest Latest
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 Go to latest Published: Dec 14, 2015 License: MIT, AGPL-3.0 Imports: 15 Imported by: 0

README

readline

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Readline is A Pure Go Implementation of a libreadline-style Library.
The goal is to be a powerful alternater for GNU-Readline.

WHY: Readline will support most of features which GNU Readline is supported, and provide a pure go environment and a MIT license.

Demo

demo

Also works fine in windows

demo windows

You can read the source code in example/main.go.

Todo

  • Vi Mode is not completely finish
  • More funny examples
  • Support dumb/eterm-color terminal in emacs

Features

  • Support emacs/vi mode, almost all basic features that GNU-Readline is supported
  • zsh-style backward/forward history search
  • zsh-style completion
  • Readline auto refresh when others write to Stdout while editing (it needs specify the Stdout/Stderr provided by *readline.Instance to others).
  • Support colourful prompt in all platforms.

Usage

  • Simplest example
import "github.com/chzyer/readline"

rl, err := readline.New("> ")
if err != nil {
	panic(err)
}
defer rl.Close()

for {
	line, err := rl.Readline()
	if err != nil { // io.EOF
		break
	}
	println(line)
}
  • Example with durable history
rl, err := readline.NewEx(&readline.Config{
	Prompt: "> ",
	HistoryFile: "/tmp/readline.tmp",
})
if err != nil {
	panic(err)
}
defer rl.Close()

for {
	line, err := rl.Readline()
	if err != nil { // io.EOF
		break
	}
	println(line)
}
  • Example with auto refresh
import (
	"log"
	"github.com/chzyer/readline"
)

rl, err := readline.New("> ")
if err != nil {
	panic(err)
}
defer rl.Close()
log.SetOutput(l.Stderr()) // let "log" write to l.Stderr instead of os.Stderr

go func() {
	for _ = range time.Tick(time.Second) {
		log.Println("hello")
	}
}()

for {
	line, err := rl.Readline()
	if err != nil { // io.EOF
		break
	}
	println(line)
}
  • Example with auto completion
import (
	"log"
	"github.com/chzyer/readline"
)

var completer = readline.NewPrefixCompleter(
	readline.PcItem("say",
		readline.PcItem("hello"),
		readline.PcItem("bye"),
	),
	readline.PcItem("help"),
)

rl, err := readline.New(&readline.Config{
	Prompt:       "> ",
	AutoComplete: completer,
})
if err != nil {
	panic(err)
}
defer rl.Close()

for {
	line, err := rl.Readline()
	if err != nil { // io.EOF
		break
	}
	println(line)
}

Shortcut

Meta+B means press Esc and n separately.
Users can change that in terminal simulator(i.e. iTerm2) to Alt+B
Notice: Meta+B is equals with Alt+B in windows.

  • Shortcut in normal mode
Shortcut Comment
Ctrl+A Beginning of line
Ctrl+B / ← Backward one character
Meta+B Backward one word
Ctrl+C Send io.EOF
Ctrl+D Delete one character
Meta+D Delete one word
Ctrl+E End of line
Ctrl+F / → Forward one character
Meta+F Forward one word
Ctrl+G Cancel
Ctrl+H Delete previous character
Ctrl+I / Tab Command line completion
Ctrl+J Line feed
Ctrl+K Cut text to the end of line
Ctrl+L Clean screen (TODO)
Ctrl+M Same as Enter key
Ctrl+N / ↓ Next line (in history)
Ctrl+P / ↑ Prev line (in history)
Ctrl+R Search backwards in history
Ctrl+S Search forwards in history
Ctrl+T Transpose characters
Meta+T Transpose words (TODO)
Ctrl+U Cut text to the beginning of line
Ctrl+W Cut previous word
Backspace Delete previous character
Meta+Backspace Cut previous word
Enter Line feed
  • Shortcut in Search Mode (Ctrl+S or Ctrl+r to enter this mode)
Shortcut Comment
Ctrl+S Search forwards in history
Ctrl+R Search backwards in history
Ctrl+C / Ctrl+G Exit Search Mode and revert the history
Backspace Delete previous character
Other Exit Search Mode
  • Shortcut in Complete Select Mode (double Tab to enter this mode)
Shortcut Comment
Ctrl+F Move Forward
Ctrl+B Move Backward
Ctrl+N Move to next line
Ctrl+P Move to previous line
Ctrl+A Move to the first candicate in current line
Ctrl+E Move to the last candicate in current line
Tab / Enter Use the word on cursor to complete
Ctrl+C / Ctrl+G Exit Complete Select Mode
Other Exit Complete Select Mode

Tested with

Environment $TERM
Mac OS X iTerm2 xterm
Mac OS X default Terminal.app xterm
Mac OS X iTerm2 Screen screen
Mac OS X iTerm2 Tmux screen
Ubuntu Server 14.04 LTS linux
Centos 7 linux
Windows 10 -
Notice:
  • Ctrl+A is not working in screen because it used as a control command by default

If you test it otherwhere, whether it works fine or not, please let me know!

Feedback

If you have any questions, please submit a github issue and any pull requests is welcomed :)

Documentation

Overview

Readline is a pure go implementation for GNU-Readline kind library.

WHY: Readline will support most of features which GNU Readline is supported, and provide a pure go environment and a MIT license.

example: 

rl, err := readline.New("> ")
if err != nil {
	panic(err)
}
defer rl.Close()

for {
	line, err := rl.Readline()
	if err != nil { // io.EOF
		break
	}
	println(line)
}

Index

Constants

View Source 
const (
	CharLineStart = 1
	CharBackward  = 2
	CharInterrupt = 3
	CharDelete    = 4
	CharLineEnd   = 5
	CharForward   = 6
	CharBell      = 7
	CharCtrlH     = 8
	CharTab       = 9
	CharCtrlJ     = 10
	CharKill      = 11
	CharEnter     = 13
	CharNext      = 14
	CharPrev      = 16
	CharBckSearch = 18
	CharFwdSearch = 19
	CharTranspose = 20
	CharCtrlU     = 21
	CharCtrlW     = 23
	CharEsc       = 27
	CharEscapeEx  = 91
	CharBackspace = 127
)
View Source 
const (
	MetaBackward rune = -iota - 1
	MetaForward
	MetaDelete
	MetaBackspace
	MetaTranspose
)
View Source 
const (
	S_STATE_FOUND = iota
	S_STATE_FAILING
)
View Source 
const (
	S_DIR_BCK = iota
	S_DIR_FWD
)
View Source 
const (
	VIM_NORMAL = iota
	VIM_INSERT
	VIM_VISUAL
)

Variables

View Source 
var (
	Stdin  io.ReadCloser  = os.Stdin
	Stdout io.WriteCloser = os.Stdout
	Stderr io.WriteCloser = os.Stderr
)
View Source 
var (
	StdinFd = int(uintptr(syscall.Stdin))
)

Functions

func Debug 

func Debug(o ...interface{})

append log info to another file

func GetInt 

func GetInt(s []string, def int) int

func IsPrintable 

func IsPrintable(key rune) bool

func IsTerminal 

func IsTerminal(fd int) bool

IsTerminal returns true if the given file descriptor is a terminal.

func IsWordBreak 

func IsWordBreak(i rune) bool

func LineCount 

func LineCount(w int) int

calculate how many lines for N character

func MakeRaw 

func MakeRaw(fd int) (*terminal.State, error)

func Restore 

func Restore(fd int, state *terminal.State) error

Types

type AutoCompleter 

type AutoCompleter interface {
	// Readline will pass the whole line and current offset to it
	// Completer need to pass all the candidates, and how long they shared the same characters in line
	// Example:
	//   Do("g", 1) => ["o", "it", "it-shell", "rep"], 1
	//   Do("gi", 2) => ["t", "t-shell"], 1
	//   Do("git", 3) => ["", "-shell"], 0
	Do(line []rune, pos int) (newLine [][]rune, length int)
}

type Config 

type Config struct {
	// prompt supports ANSI escape sequence, so we can color some characters even in windows
	Prompt string

	// readline will persist historys to file where HistoryFile specified
	HistoryFile string
	// specify the max length of historys, it's 500 by default
	HistoryLimit int

	// AutoCompleter will called once user press TAB
	AutoComplete AutoCompleter

	// If VimMode is true, readline will in vim.insert mode by default
	VimMode bool

	Stdout io.Writer
	Stderr io.Writer
	// contains filtered or unexported fields
}

func (*Config) Init 

func (c *Config) Init() error

type Instance 

type Instance struct {
	Config    *Config
	Terminal  *Terminal
	Operation *Operation
}

func New 

func New(prompt string) (*Instance, error)

func NewEx 

func NewEx(cfg *Config) (*Instance, error)

func (*Instance) Close 

func (i *Instance) Close() error

we must make sure that call Close() before process exit.

func (*Instance) IsVimMode 

func (i *Instance) IsVimMode() bool

func (*Instance) ReadPassword 

func (i *Instance) ReadPassword(prompt string) ([]byte, error)

func (*Instance) ReadSlice 

func (i *Instance) ReadSlice() ([]byte, error)

same as readline

func (*Instance) Readline 

func (i *Instance) Readline() (string, error)

func (*Instance) SetHistoryPath 

func (i *Instance) SetHistoryPath(p string)

change hisotry persistence in runtime

func (*Instance) SetPrompt 

func (i *Instance) SetPrompt(s string)

func (*Instance) SetVimMode 

func (i *Instance) SetVimMode(on bool)

switch VimMode in runtime

func (*Instance) Stderr 

func (i *Instance) Stderr() io.Writer

readline will refresh automatic when write through Stdout()

func (*Instance) Stdout 

func (i *Instance) Stdout() io.Writer

readline will refresh automatic when write through Stdout()

type Operation 

type Operation struct {
	// contains filtered or unexported fields
}

func NewOperation 

func NewOperation(t *Terminal, cfg *Config) *Operation

func (*Operation) Close 

func (o *Operation) Close()

func (Operation) CloseHistory 

func (o Operation) CloseHistory()

func (Operation) CompactHistory 

func (o Operation) CompactHistory()

func (Operation) CompleteRefresh 

func (o Operation) CompleteRefresh()

func (Operation) EnterCompleteMode 

func (o Operation) EnterCompleteMode(offset int, candidate [][]rune)

func (Operation) EnterCompleteSelectMode 

func (o Operation) EnterCompleteSelectMode()

func (Operation) EnterVimInsertMode 

func (o Operation) EnterVimInsertMode()

func (Operation) ExitCompleteMode 

func (o Operation) ExitCompleteMode(revent bool)

func (Operation) ExitCompleteSelectMode 

func (o Operation) ExitCompleteSelectMode()

func (Operation) ExitSearchMode 

func (o Operation) ExitSearchMode(revert bool)

func (Operation) ExitVimInsertMode 

func (o Operation) ExitVimInsertMode()

func (Operation) ExitVimMode 

func (o Operation) ExitVimMode()

func (Operation) FindHistoryBck 

func (o Operation) FindHistoryBck(isNewSearch bool, rs []rune, start int) (int, *list.Element)

func (Operation) FindHistoryFwd 

func (o Operation) FindHistoryFwd(isNewSearch bool, rs []rune, start int) (int, *list.Element)

func (Operation) HandleCompleteSelect 

func (o Operation) HandleCompleteSelect(r rune) bool

func (Operation) HandleVim 

func (o Operation) HandleVim(r rune, readNext func() rune) rune

func (Operation) HandleVimNormal 

func (o Operation) HandleVimNormal(r rune, readNext func() rune) (t rune)

func (Operation) HistoryRewrite 

func (o Operation) HistoryRewrite()

func (Operation) IsEnableVimMode 

func (o Operation) IsEnableVimMode() bool

func (Operation) IsInCompleteMode 

func (o Operation) IsInCompleteMode() bool

func (Operation) IsInCompleteSelectMode 

func (o Operation) IsInCompleteSelectMode() bool

func (Operation) IsSearchMode 

func (o Operation) IsSearchMode() bool

func (Operation) NewHistory 

func (o Operation) NewHistory(current []rune)

func (Operation) NextHistory 

func (o Operation) NextHistory() ([]rune, bool)

func (Operation) OnComplete 

func (o Operation) OnComplete()

func (*Operation) Password 

func (o *Operation) Password(prompt string) ([]byte, error)

func (Operation) PrevHistory 

func (o Operation) PrevHistory() []rune

func (Operation) PushHistory 

func (o Operation) PushHistory(s []rune)

func (*Operation) Runes 

func (o *Operation) Runes() ([]rune, error)

func (Operation) SearchBackspace 

func (o Operation) SearchBackspace()

func (Operation) SearchChar 

func (o Operation) SearchChar(r rune)

func (Operation) SearchMode 

func (o Operation) SearchMode(dir int)

func (Operation) SearchRefresh 

func (o Operation) SearchRefresh(x int)

func (*Operation) SetHistoryPath 

func (o *Operation) SetHistoryPath(path string)

func (*Operation) SetPrompt 

func (o *Operation) SetPrompt(s string)

func (*Operation) SetTitle 

func (o *Operation) SetTitle(t string)

func (Operation) SetVimMode 

func (o Operation) SetVimMode(on bool)

func (*Operation) Slice 

func (o *Operation) Slice() ([]byte, error)

func (*Operation) Stderr 

func (o *Operation) Stderr() io.Writer

func (*Operation) Stdout 

func (o *Operation) Stdout() io.Writer

func (*Operation) String 

func (o *Operation) String() (string, error)

func (Operation) UpdateHistory 

func (o Operation) UpdateHistory(s []rune, commit bool)

type PrefixCompleter 

type PrefixCompleter struct {
	Name     []rune
	Children []*PrefixCompleter
}

func NewPrefixCompleter 

func NewPrefixCompleter(pc ...*PrefixCompleter) *PrefixCompleter

func PcItem 

func PcItem(name string, pc ...*PrefixCompleter) *PrefixCompleter

func (*PrefixCompleter) Do 

func (p *PrefixCompleter) Do(line []rune, pos int) (newLine [][]rune, offset int)

type RuneBuffer 

type RuneBuffer struct {
	// contains filtered or unexported fields
}

func NewRuneBuffer 

func NewRuneBuffer(w io.Writer, prompt string) *RuneBuffer

func (*RuneBuffer) BackEscapeWord 

func (r *RuneBuffer) BackEscapeWord()

func (*RuneBuffer) Backspace 

func (r *RuneBuffer) Backspace()

func (*RuneBuffer) Backup 

func (r *RuneBuffer) Backup()

func (*RuneBuffer) Clean 

func (r *RuneBuffer) Clean()

func (*RuneBuffer) CurrentWidth 

func (r *RuneBuffer) CurrentWidth(x int) int

func (*RuneBuffer) CursorLineCount 

func (r *RuneBuffer) CursorLineCount() int

func (*RuneBuffer) Delete 

func (r *RuneBuffer) Delete() (success bool)

func (*RuneBuffer) DeleteWord 

func (r *RuneBuffer) DeleteWord()

func (*RuneBuffer) Erase 

func (r *RuneBuffer) Erase()

func (*RuneBuffer) IdxLine 

func (r *RuneBuffer) IdxLine() int

func (*RuneBuffer) Kill 

func (r *RuneBuffer) Kill()

func (*RuneBuffer) KillFront 

func (r *RuneBuffer) KillFront()

func (*RuneBuffer) Len 

func (r *RuneBuffer) Len() int

func (*RuneBuffer) LineCount 

func (r *RuneBuffer) LineCount() int

func (*RuneBuffer) MoveBackward 

func (r *RuneBuffer) MoveBackward()

func (*RuneBuffer) MoveForward 

func (r *RuneBuffer) MoveForward()

func (*RuneBuffer) MoveTo 

func (r *RuneBuffer) MoveTo(ch rune, prevChar, reverse bool) (success bool)

func (*RuneBuffer) MoveToLineEnd 

func (r *RuneBuffer) MoveToLineEnd()

func (*RuneBuffer) MoveToLineStart 

func (r *RuneBuffer) MoveToLineStart()

func (*RuneBuffer) MoveToNextWord 

func (r *RuneBuffer) MoveToNextWord()

func (*RuneBuffer) MoveToPrevWord 

func (r *RuneBuffer) MoveToPrevWord() (success bool)

func (*RuneBuffer) Pos 

func (r *RuneBuffer) Pos() int

func (*RuneBuffer) PromptLen 

func (r *RuneBuffer) PromptLen() int

func (*RuneBuffer) Refresh 

func (r *RuneBuffer) Refresh(f func())

func (*RuneBuffer) Reset 

func (r *RuneBuffer) Reset() []rune

func (*RuneBuffer) Restore 

func (r *RuneBuffer) Restore()

func (*RuneBuffer) RuneSlice 

func (r *RuneBuffer) RuneSlice(i int) []rune

func (*RuneBuffer) Runes 

func (r *RuneBuffer) Runes() []rune

func (*RuneBuffer) Set 

func (r *RuneBuffer) Set(buf []rune)

func (*RuneBuffer) SetPrompt 

func (r *RuneBuffer) SetPrompt(prompt string)

func (*RuneBuffer) SetStyle 

func (r *RuneBuffer) SetStyle(start, end int, style string)

func (*RuneBuffer) SetWithIdx 

func (r *RuneBuffer) SetWithIdx(idx int, buf []rune)

func (*RuneBuffer) Transpose 

func (r *RuneBuffer) Transpose()

func (*RuneBuffer) WriteRune 

func (r *RuneBuffer) WriteRune(s rune)

func (*RuneBuffer) WriteRunes 

func (r *RuneBuffer) WriteRunes(s []rune)

func (*RuneBuffer) WriteString 

func (r *RuneBuffer) WriteString(s string)

type Terminal 

type Terminal struct {
	// contains filtered or unexported fields
}

func NewTerminal 

func NewTerminal(cfg *Config) (*Terminal, error)

func (*Terminal) Bell 

func (t *Terminal) Bell()

func (*Terminal) Close 

func (t *Terminal) Close() error

func (*Terminal) IsReading 

func (t *Terminal) IsReading() bool

func (*Terminal) KickRead 

func (t *Terminal) KickRead()

func (*Terminal) Print 

func (t *Terminal) Print(s string)

func (*Terminal) PrintRune 

func (t *Terminal) PrintRune(r rune)

func (*Terminal) ReadRune 

func (t *Terminal) ReadRune() rune

func (*Terminal) Readline 

func (t *Terminal) Readline() *Operation

func (*Terminal) Write 

func (t *Terminal) Write(b []byte) (int, error)

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