prompt

package module
v0.1.1 Latest Latest
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 Go to latest Published: Oct 10, 2017 License: MIT Imports: 14 Imported by: 0

README

go-prompt

Library for building a powerful interactive prompt, inspired by python-prompt-toolkit. Easy building a multi-platform binary of the command line tools because written in Golang.

package main

import (
	"fmt"
	"github.com/c-bata/go-prompt"
)

func completer(d prompt.Document) []prompt.Suggest {
	s := []prompt.Suggest{
		{Text: "users", Description: "Store the username and age"},
		{Text: "articles", Description: "Store the article text posted by user"},
		{Text: "comments", Description: "Store the text commented to articles"},
	}
	return prompt.FilterHasPrefix(s, d.GetWordBeforeCursor(), true)
}

func main() {
	fmt.Println("Please select table.")
	t := prompt.Input("> ", completer)
	fmt.Println("You selected " + t)
}
Projects using go-prompt

Features

Powerful auto-completion

demo

(This is a GIF animation of kube-prompt.)

Flexible options

go-prompt provides many options. All options are listed in Developer Guide.

options

Keyboard Shortcuts

Emacs-like keyboard shortcut is available by default (it's also default shortcuts in Bash shell). You can customize and expand these shortcuts.

keyboard shortcuts

KeyBinding Description
Ctrl + A Go to the beginning of the line (Home)
Ctrl + E Go to the End of the line (End)
Ctrl + P Previous command (Up arrow)
Ctrl + N Next command (Down arrow)
Ctrl + F Forward one character
Ctrl + B Backward one character
Ctrl + D Delete character under the cursor
Ctrl + H Delete character before the cursor (Backspace)
Ctrl + W Cut the Word before the cursor to the clipboard.
Ctrl + K Cut the Line after the cursor to the clipboard.
Ctrl + U Cut/delete the Line before the cursor to the clipboard.
History

You can use up-arrow and down-arrow to walk through the history of commands executed.

History

Author

Masashi Shibata

LICENSE

This software is licensed under the MIT License (See LICENSE ).

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var SwitchKeyBindMode = OptionSwitchKeyBindMode

SwitchKeyBindMode to set a key bind mode. Deprecated: Please use OptionSwitchKeyBindMode.

Functions

func BisectLeft 

func BisectLeft(a []int, v int) int

BisectLeft to Locate the insertion point for v in a to maintain sorted order.

func BisectRight 

func BisectRight(a []int, v int) int

BisectRight to Locate the insertion point for v in a to maintain sorted order.

func Choose 

func Choose(prefix string, choices []string, opts ...Option) string

Choose to the shortcut of input function to select from string array.

func Input 

func Input(prefix string, completer Completer, opts ...Option) string

Input get the input data from the user and return it.

Types

type ASCIICode 

type ASCIICode struct {
	Key       Key
	ASCIICode []byte
}

ASCIICode is the type contains Key and it's ascii byte array.

type Buffer 

type Buffer struct {
	CursorPosition int
	// contains filtered or unexported fields
}

Buffer emulates the console buffer.

func NewBuffer 

func NewBuffer() (b *Buffer)

NewBuffer is constructor of Buffer struct.

func (*Buffer) CursorDown 

func (b *Buffer) CursorDown(count int)

CursorDown move cursor to the next line. (for multi-line edit).

func (*Buffer) CursorLeft 

func (b *Buffer) CursorLeft(count int)

CursorLeft move to left on the current line.

func (*Buffer) CursorRight 

func (b *Buffer) CursorRight(count int)

CursorRight move to right on the current line.

func (*Buffer) CursorUp 

func (b *Buffer) CursorUp(count int)

CursorUp move cursor to the previous line. (for multi-line edit).

func (*Buffer) Delete 

func (b *Buffer) Delete(count int) (deleted string)

Delete specified number of characters and Return the deleted text.

func (*Buffer) DeleteBeforeCursor 

func (b *Buffer) DeleteBeforeCursor(count int) (deleted string)

DeleteBeforeCursor delete specified number of characters before cursor and return the deleted text.

func (*Buffer) Document 

func (b *Buffer) Document() (d *Document)

Document method to return document instance from the current text and cursor position.

func (*Buffer) InsertText 

func (b *Buffer) InsertText(v string, overwrite bool, moveCursor bool)

InsertText insert string from current line.

func (*Buffer) JoinNextLine 

func (b *Buffer) JoinNextLine(separator string)

JoinNextLine joins the next line to the current one by deleting the line ending after the current line.

func (*Buffer) NewLine 

func (b *Buffer) NewLine(copyMargin bool)

NewLine means CR.

func (*Buffer) SwapCharactersBeforeCursor 

func (b *Buffer) SwapCharactersBeforeCursor()

SwapCharactersBeforeCursor swaps the last two characters before the cursor.

func (*Buffer) Text 

func (b *Buffer) Text() string

Text returns string of the current line.

type Color 

type Color int
const (
	DefaultColor Color = iota

	// Low intensity
	Black
	DarkRed
	DarkGreen
	Brown
	DarkBlue
	Purple
	Cyan
	LightGray

	// High intensity
	DarkGray
	Red
	Green
	Yellow
	Blue
	Fuchsia
	Turquoise
	White
)

type Completer 

type Completer func(Document) []Suggest

Completer should return the suggest item from Document.

type CompletionManager 

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

CompletionManager manages which suggestion is now selected.

func NewCompletionManager 

func NewCompletionManager(completer Completer, max uint16) *CompletionManager

NewCompletionManager returns initialized CompletionManager object.

func (*CompletionManager) Completing 

func (c *CompletionManager) Completing() bool

Completing returns whether the CompletionManager selects something one.

func (*CompletionManager) GetSelectedSuggestion 

func (c *CompletionManager) GetSelectedSuggestion() (s Suggest, ok bool)

GetSelectedSuggestion returns the selected item.

func (*CompletionManager) GetSuggestions 

func (c *CompletionManager) GetSuggestions() []Suggest

GetSelectedSuggestion returns the list of suggestion.

func (*CompletionManager) Next 

func (c *CompletionManager) Next()

Next to select the next suggestion item.

func (*CompletionManager) Previous 

func (c *CompletionManager) Previous()

Previous to select the previous suggestion item.

func (*CompletionManager) Reset 

func (c *CompletionManager) Reset()

Reset to select nothing.

func (*CompletionManager) Update 

func (c *CompletionManager) Update(in Document)

Update to update the suggestions.

type ConsoleParser 

type ConsoleParser interface {
	// Setup
	Setup() error
	// TearDown
	TearDown() error
	// GetSCIICode returns ASCIICode correspond to input byte codes.
	GetKey(b []byte) Key
	// GetWinSize returns winsize struct which is the response of ioctl(2).
	GetWinSize() *WinSize
}

type ConsoleWriter 

type ConsoleWriter interface {
	WriteRaw(data []byte)
	Write(data []byte)
	WriteStr(data string)
	WriteRawStr(data string)
	Flush() error

	EraseScreen()
	EraseUp()
	EraseDown()
	EraseStartOfLine()
	EraseEndOfLine()
	EraseLine()

	ShowCursor()
	HideCursor()
	CursorGoTo(row, col int)
	CursorUp(n int)
	CursorDown(n int)
	CursorForward(n int)
	CursorBackward(n int)
	AskForCPR()
	SaveCursor()
	UnSaveCursor()

	ScrollDown()
	ScrollUp()

	SetTitle(title string)
	ClearTitle()

	SetColor(fg, bg Color, bold bool)
}

type Document 

type Document struct {
	Text           string
	CursorPosition int
}

Document has text displayed in terminal and cursor position.

func NewDocument 

func NewDocument() *Document

NewDocument return the new empty document.

func (*Document) CurrentLine 

func (d *Document) CurrentLine() string

CurrentLine return the text on the line where the cursor is. (when the input consists of just one line, it equals `text`.

func (*Document) CurrentLineAfterCursor 

func (d *Document) CurrentLineAfterCursor() string

CurrentLineAfterCursor returns the text from the cursor until the end of the line.

func (*Document) CurrentLineBeforeCursor 

func (d *Document) CurrentLineBeforeCursor() string

CurrentLineBeforeCursor returns the text from the start of the line until the cursor.

func (*Document) CursorPositionCol 

func (d *Document) CursorPositionCol() (col int)

CursorPositionCol returns the current column. (0-based.)

func (*Document) CursorPositionRow 

func (d *Document) CursorPositionRow() (row int)

CursorPositionRow returns the current row. (0-based.)

func (*Document) FindStartOfPreviousWord 

func (d *Document) FindStartOfPreviousWord() int

FindStartOfPreviousWord returns an index relative to the cursor position pointing to the start of the previous word. Return `None` if nothing was found.

func (*Document) FindStartOfPreviousWordWithSpace added in v0.1.1 

func (d *Document) FindStartOfPreviousWordWithSpace() int

FindStartOfPreviousWordWithSpace is almost the same as FindStartOfPreviousWord. The only difference is to ignore contiguous spaces.

func (*Document) GetCharRelativeToCursor 

func (d *Document) GetCharRelativeToCursor(offset int) (r rune)

GetCharRelativeToCursor return character relative to cursor position, or empty string

func (*Document) GetCursorDownPosition 

func (d *Document) GetCursorDownPosition(count int, preferredColumn int) int

GetCursorDownPosition return the relative cursor position (character index) where we would be if the user pressed the arrow-down button.

func (*Document) GetCursorLeftPosition 

func (d *Document) GetCursorLeftPosition(count int) int

GetCursorLeftPosition returns the relative position for cursor left.

func (*Document) GetCursorRightPosition 

func (d *Document) GetCursorRightPosition(count int) int

GetCursorRightPosition returns relative position for cursor right.

func (*Document) GetCursorUpPosition 

func (d *Document) GetCursorUpPosition(count int, preferredColumn int) int

GetCursorUpPosition return the relative cursor position (character index) where we would be if the user pressed the arrow-up button.

func (*Document) GetEndOfLinePosition 

func (d *Document) GetEndOfLinePosition() int

GetEndOfLinePosition returns relative position for the end of this line.

func (*Document) GetWordBeforeCursor 

func (d *Document) GetWordBeforeCursor() string

GetWordBeforeCursor returns the word before the cursor. If we have whitespace before the cursor this returns an empty string.

func (*Document) GetWordBeforeCursorWithSpace added in v0.1.1 

func (d *Document) GetWordBeforeCursorWithSpace() string

GetWordBeforeCursorWithSpace returns the word before the cursor. Unlike GetWordBeforeCursor, it returns string containing space

func (*Document) LineCount 

func (d *Document) LineCount() int

LineCount return the number of lines in this document. If the document ends with a trailing \n, that counts as the beginning of a new line.

func (*Document) Lines 

func (d *Document) Lines() []string

Lines returns the array of all the lines.

func (*Document) OnLastLine 

func (d *Document) OnLastLine() bool

OnLastLine returns true when we are at the last line.

func (*Document) TextAfterCursor 

func (d *Document) TextAfterCursor() string

TextAfterCursor returns the text after the cursor.

func (*Document) TextBeforeCursor 

func (d *Document) TextBeforeCursor() string

TextBeforeCursor returns the text before the cursor.

func (*Document) TranslateIndexToPosition 

func (d *Document) TranslateIndexToPosition(index int) (row int, col int)

TranslateIndexToPosition given an index for the text, return the corresponding (row, col) tuple. (0-based. Returns (0, 0) for index=0.)

func (*Document) TranslateRowColToIndex 

func (d *Document) TranslateRowColToIndex(row int, column int) (index int)

TranslateRowColToIndex given a (row, col), return the corresponding index. (Row and col params are 0-based.)

type Exec 

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

Exec is the struct contains user input context.

type Executor 

type Executor func(string)

Executor is called when user input something text.

type Filter 

type Filter func([]Suggest, string, bool) []Suggest

Filter is the type to filter the prompt.Suggestion array.

type History 

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

func NewHistory 

func NewHistory() *History

func (*History) Add 

func (h *History) Add(input string)

func (*History) Clear 

func (h *History) Clear()

func (*History) Newer 

func (h *History) Newer(buf *Buffer) (new *Buffer, changed bool)

func (*History) Older 

func (h *History) Older(buf *Buffer) (new *Buffer, changed bool)

type Key 

type Key int

Key is the type express the key inserted from user. 

const (
	Escape Key = iota

	ControlA
	ControlB
	ControlC
	ControlD
	ControlE
	ControlF
	ControlG
	ControlH
	ControlI
	ControlJ
	ControlK
	ControlL
	ControlM
	ControlN
	ControlO
	ControlP
	ControlQ
	ControlR
	ControlS
	ControlT
	ControlU
	ControlV
	ControlW
	ControlX
	ControlY
	ControlZ

	ControlSpace
	ControlBackslash
	ControlSquareClose
	ControlCircumflex
	ControlUnderscore
	ControlLeft
	ControlRight
	ControlUp
	ControlDown

	Up
	Down
	Right
	Left

	ShiftLeft
	ShiftUp
	ShiftDown
	ShiftRight

	Home
	End
	Delete
	ShiftDelete
	ControlDelete
	PageUp
	PageDown
	BackTab
	Insert
	Backspace

	// Aliases.
	Tab
	Enter

	F1
	F2
	F3
	F4
	F5
	F6
	F7
	F8
	F9
	F10
	F11
	F12
	F13
	F14
	F15
	F16
	F17
	F18
	F19
	F20
	F21
	F22
	F23
	F24

	// Matches any key.
	Any

	// Special
	CPRResponse
	Vt100MouseEvent
	WindowsMouseEvent
	BracketedPaste

	// Key which is ignored. (The key binding for this key should not do anything.)
	Ignore

	// Key is not defined
	NotDefined
)

func (Key) String 

func (i Key) String() string

type KeyBind 

type KeyBind struct {
	Key Key
	Fn  KeyBindFunc
}

type KeyBindFunc 

type KeyBindFunc func(*Buffer)

type KeyBindMode 

type KeyBindMode string
const (
	CommonKeyBind KeyBindMode = "common"
	EmacsKeyBind  KeyBindMode = "emacs"
)

type Option added in v0.1.1 

type Option func(prompt *Prompt) error

Option is the type to replace default parameters. prompt.New accepts any number of options (this is functional option pattern).

func OptionAddKeyBind 

func OptionAddKeyBind(b ...KeyBind) Option

OptionAddKeyBind to set a custom key bind.

func OptionDescriptionBGColor 

func OptionDescriptionBGColor(x Color) Option

func OptionDescriptionTextColor 

func OptionDescriptionTextColor(x Color) Option

func OptionHistory 

func OptionHistory(x []string) Option

OptionHistory to set history expressed by string array.

func OptionInputBGColor 

func OptionInputBGColor(x Color) Option

func OptionInputTextColor 

func OptionInputTextColor(x Color) Option

func OptionMaxSuggestion 

func OptionMaxSuggestion(x uint16) Option

OptionMaxSuggestion specify the max number of displayed suggestions.

func OptionParser 

func OptionParser(x ConsoleParser) Option

OptionParser to set a custom ConsoleParser object. An argument should implement ConsoleParser interface.

func OptionPrefix 

func OptionPrefix(x string) Option

OptionPrefix to set prefix string.

func OptionPrefixBackgroundColor 

func OptionPrefixBackgroundColor(x Color) Option

func OptionPrefixTextColor 

func OptionPrefixTextColor(x Color) Option

func OptionPreviewSuggestionBGColor 

func OptionPreviewSuggestionBGColor(x Color) Option

func OptionPreviewSuggestionTextColor 

func OptionPreviewSuggestionTextColor(x Color) Option

func OptionSelectedDescriptionBGColor 

func OptionSelectedDescriptionBGColor(x Color) Option

func OptionSelectedDescriptionTextColor 

func OptionSelectedDescriptionTextColor(x Color) Option

func OptionSelectedSuggestionBGColor 

func OptionSelectedSuggestionBGColor(x Color) Option

func OptionSelectedSuggestionTextColor 

func OptionSelectedSuggestionTextColor(x Color) Option

func OptionSuggestionBGColor 

func OptionSuggestionBGColor(x Color) Option

func OptionSuggestionTextColor 

func OptionSuggestionTextColor(x Color) Option

func OptionSwitchKeyBindMode added in v0.1.1 

func OptionSwitchKeyBindMode(m KeyBindMode) Option

OptionSwitchKeyBindMode set a key bind mode.

func OptionTitle 

func OptionTitle(x string) Option

OptionTitle to set title displayed at the header bar of terminal.

func OptionWriter 

func OptionWriter(x ConsoleWriter) Option

OptionWriter to set a custom ConsoleWriter object. An argument should implement ConsoleWriter interace.

type Prompt 

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

Prompt is core struct of go-prompt.

func New 

func New(executor Executor, completer Completer, opts ...Option) *Prompt

New returns a Prompt with powerful auto-completion.

func (*Prompt) Input 

func (p *Prompt) Input() string

Input just returns user input text.

func (*Prompt) Run 

func (p *Prompt) Run()

Run starts prompt.

type Render 

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

Render to render prompt information from state of Buffer.

func (*Render) BreakLine 

func (r *Render) BreakLine(buffer *Buffer)

BreakLine to break line.

func (*Render) Render 

func (r *Render) Render(buffer *Buffer, completion *CompletionManager)

Render renders to the console.

func (*Render) Setup 

func (r *Render) Setup()

Setup to initialize console output.

func (*Render) TearDown 

func (r *Render) TearDown()

TearDown to clear title and erasing.

func (*Render) UpdateWinSize 

func (r *Render) UpdateWinSize(ws *WinSize)

UpdateWinSize called when window size is changed.

type Suggest 

type Suggest struct {
	Text        string
	Description string
}

Suggest is printed when completing.

func FilterContains 

func FilterContains(completions []Suggest, sub string, ignoreCase bool) []Suggest

FilterContains checks whether the completion.Text contains sub.

func FilterHasPrefix 

func FilterHasPrefix(completions []Suggest, sub string, ignoreCase bool) []Suggest

FilterHasPrefix checks whether the string completions.Text begins with sub.

func FilterHasSuffix 

func FilterHasSuffix(completions []Suggest, sub string, ignoreCase bool) []Suggest

FilterHasSuffix checks whether the completion.Text ends with sub.

type VT100Parser 

type VT100Parser struct {
	// contains filtered or unexported fields
}

func NewVT100StandardInputParser 

func NewVT100StandardInputParser() *VT100Parser

func (*VT100Parser) GetKey 

func (t *VT100Parser) GetKey(b []byte) Key

func (*VT100Parser) GetWinSize 

func (t *VT100Parser) GetWinSize() *WinSize

GetWinSize returns winsize struct which is the response of ioctl(2).

func (*VT100Parser) Setup 

func (t *VT100Parser) Setup() error

func (*VT100Parser) TearDown 

func (t *VT100Parser) TearDown() error

type VT100Writer 

type VT100Writer struct {
	// contains filtered or unexported fields
}

func NewVT100StandardOutputWriter 

func NewVT100StandardOutputWriter() *VT100Writer

func (*VT100Writer) AskForCPR 

func (w *VT100Writer) AskForCPR()

func (*VT100Writer) ClearTitle 

func (w *VT100Writer) ClearTitle()

func (*VT100Writer) CursorBackward 

func (w *VT100Writer) CursorBackward(n int)

func (*VT100Writer) CursorDown 

func (w *VT100Writer) CursorDown(n int)

func (*VT100Writer) CursorForward 

func (w *VT100Writer) CursorForward(n int)

func (*VT100Writer) CursorGoTo 

func (w *VT100Writer) CursorGoTo(row, col int)

func (*VT100Writer) CursorUp 

func (w *VT100Writer) CursorUp(n int)

func (*VT100Writer) EraseDown 

func (w *VT100Writer) EraseDown()

func (*VT100Writer) EraseEndOfLine 

func (w *VT100Writer) EraseEndOfLine()

func (*VT100Writer) EraseLine 

func (w *VT100Writer) EraseLine()

func (*VT100Writer) EraseScreen 

func (w *VT100Writer) EraseScreen()

func (*VT100Writer) EraseStartOfLine 

func (w *VT100Writer) EraseStartOfLine()

func (*VT100Writer) EraseUp 

func (w *VT100Writer) EraseUp()

func (*VT100Writer) Flush 

func (w *VT100Writer) Flush() error

func (*VT100Writer) HideCursor 

func (w *VT100Writer) HideCursor()

func (*VT100Writer) SaveCursor 

func (w *VT100Writer) SaveCursor()

func (*VT100Writer) ScrollDown 

func (w *VT100Writer) ScrollDown()

func (*VT100Writer) ScrollUp 

func (w *VT100Writer) ScrollUp()

func (*VT100Writer) SetColor 

func (w *VT100Writer) SetColor(fg, bg Color, bold bool)

func (*VT100Writer) SetTitle 

func (w *VT100Writer) SetTitle(title string)

func (*VT100Writer) ShowCursor 

func (w *VT100Writer) ShowCursor()

func (*VT100Writer) UnSaveCursor 

func (w *VT100Writer) UnSaveCursor()

func (*VT100Writer) Write 

func (w *VT100Writer) Write(data []byte)

func (*VT100Writer) WriteRaw 

func (w *VT100Writer) WriteRaw(data []byte)

func (*VT100Writer) WriteRawStr 

func (w *VT100Writer) WriteRawStr(data string)

func (*VT100Writer) WriteStr 

func (w *VT100Writer) WriteStr(data string)

type WinSize 

type WinSize struct {
	Row uint16
	Col uint16
}

Source Files

View all Source files

Directories

Path Synopsis
_example
echo
exec-command
input
sleep

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