spinner

README

Spinner

spinner is a simple package to add a spinner / progress indicator to any terminal application. Examples can be found below as well as full examples in the examples directory.

For more detail about the library and its features, reference your local godoc once installed.

Contributions welcome!

Installation

go get github.com/briandowns/spinner

Available Character Sets

(Numbered by their slice index)

index	character set	sample gif
0	←↖↑↗→↘↓↙
1	▁▃▄▅▆▇█▇▆▅▄▃▁
2	▖▘▝▗
3	┤┘┴└├┌┬┐
4	◢◣◤◥
5	◰◳◲◱
6	◴◷◶◵
7	◐◓◑◒
8	.oO@*
9	|/-\
10	◡◡⊙⊙◠◠
11	⣾⣽⣻⢿⡿⣟⣯⣷
12	>))'> >))'> >))'> >))'> >))'> <'((< <'((< <'((<
13	⠁⠂⠄⡀⢀⠠⠐⠈
14	⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏
15	abcdefghijklmnopqrstuvwxyz
16	▉▊▋▌▍▎▏▎▍▌▋▊▉
17	■□▪▫
18	←↑→↓
19	╫╪
20	⇐⇖⇑⇗⇒⇘⇓⇙
21	⠁⠁⠉⠙⠚⠒⠂⠂⠒⠲⠴⠤⠄⠄⠤⠠⠠⠤⠦⠖⠒⠐⠐⠒⠓⠋⠉⠈⠈
22	⠈⠉⠋⠓⠒⠐⠐⠒⠖⠦⠤⠠⠠⠤⠦⠖⠒⠐⠐⠒⠓⠋⠉⠈
23	⠁⠉⠙⠚⠒⠂⠂⠒⠲⠴⠤⠄⠄⠤⠴⠲⠒⠂⠂⠒⠚⠙⠉⠁
24	⠋⠙⠚⠒⠂⠂⠒⠲⠴⠦⠖⠒⠐⠐⠒⠓⠋
25	ｦｧｨｩｪｫｬｭｮｯｱｲｳｴｵｶｷｸｹｺｻｼｽｾｿﾀﾁﾂﾃﾄﾅﾆﾇﾈﾉﾊﾋﾌﾍﾎﾏﾐﾑﾒﾓﾔﾕﾖﾗﾘﾙﾚﾛﾜﾝ
26	. .. ...
27	▁▂▃▄▅▆▇█▉▊▋▌▍▎▏▏▎▍▌▋▊▉█▇▆▅▄▃▂▁
28	.oO°Oo.
29	+x
30	v<^>
31	>>---> >>---> >>---> >>---> >>---> <---<< <---<< <---<< <---<< <---<<
32	| || ||| |||| ||||| |||||| ||||| |||| ||| || |
33	[] [=] [==] [===] [====] [=====] [======] [=======] [========] [=========] [==========]
34	(*---------) (-*--------) (--*-------) (---*------) (----*-----) (-----*----) (------*---) (-------*--) (--------*-) (---------*)
35	█▒▒▒▒▒▒▒▒▒ ███▒▒▒▒▒▒▒ █████▒▒▒▒▒ ███████▒▒▒ ██████████
36	[ ] [=> ] [===> ] [=====> ] [======> ] [========> ] [==========> ] [============> ] [==============> ] [================> ] [==================> ] [===================>]
37	🕐 🕑 🕒 🕓 🕔 🕕 🕖 🕗 🕘 🕙 🕚 🕛
38	🕐 🕜 🕑 🕝 🕒 🕞 🕓 🕟 🕔 🕠 🕕 🕡 🕖 🕢 🕗 🕣 🕘 🕤 🕙 🕥 🕚 🕦 🕛 🕧
39	🌍 🌎 🌏
40	◜ ◝ ◞ ◟
41	⬒ ⬔ ⬓ ⬕
42	⬖ ⬘ ⬗ ⬙
43	[>>> >] []>>>> [] [] >>>> [] [] >>>> [] [] >>>> [] [] >>>>[] [>> >>]

Features

• Start
• Stop
• Restart
• Reverse direction
• Update the spinner character set
• Update the spinner speed
• Prefix or append text
• Change spinner color, background, and text attributes such as bold / italics
• Get spinner status
• Chain, pipe, redirect output
• Output final string on spinner/indicator completion

Examples

package main

import (
	"github.com/briandowns/spinner"
	"time"
)

func main() {
	s := spinner.New(spinner.CharSets[9], 100*time.Millisecond)  // Build our new spinner
	s.Start()                                                    // Start the spinner
	time.Sleep(4 * time.Second)                                  // Run for some time to simulate work
	s.Stop()
}

Update the character set and restart the spinner

s.UpdateCharSet(spinner.CharSets[1])  // Update spinner to use a different character set
s.Restart()                           // Restart the spinner
time.Sleep(4 * time.Second)
s.Stop()

Update spin speed and restart the spinner

s.UpdateSpeed(200 * time.Millisecond) // Update the speed the spinner spins at
s.Restart()
time.Sleep(4 * time.Second)
s.Stop()

Reverse the direction of the spinner

s.Reverse() // Reverse the direction the spinner is spinning
s.Restart()
time.Sleep(4 * time.Second)
s.Stop()

Provide your own spinner

(or send me an issue or pull request to add to the project)

someSet := []string{"+", "-"}
s := spinner.New(someSet, 100*time.Millisecond)

Prefix or append text to the spinner

s.Prefix = "prefixed text: " // Prefix text before the spinner
s.Suffix = "  :appended text" // Append text after the spinner

Set or change the color of the spinner. Default color is white. This will restart the spinner with the new color.

s.Color("red") // Set the spinner color to red

You can specify both the background and foreground color, as well as additional attributes such as bold or underline.

s.Color("red", "bold") // Set the spinner color to a bold red

Or to set the background to black, the foreground to a bold red:

s.Color("bgBlack", "bold", "fgRed")

Below is the full color and attribute list:

// default colors
red
black
green
yellow
blue
magenta
cyan
white

// attributes
reset
bold
faint
italic
underline
blinkslow
blinkrapid
reversevideo
concealed
crossedout

// foreground text
fgBlack
fgRed
fgGreen
fgYellow
fgBlue
fgMagenta
fgCyan
fgWhite

// foreground Hi-Intensity text
fgHiBlack
fgHiRed
fgHiGreen
fgHiYellow
fgHiBlue
fgHiMagenta
fgHiCyan
fgHiWhite

// background text
bgBlack
bgRed
bgGreen
bgYellow
bgBlue
bgMagenta
bgCyan
bgWhite

// background Hi-Intensity text
bgHiBlack
bgHiRed
bgHiGreen
bgHiYellow
bgHiBlue
bgHiMagenta
bgHiCyan
bgHiWhite

Generate a sequence of numbers

setOfDigits := spinner.GenerateNumberSequence(25)    // Generate a 25 digit string of numbers
s := spinner.New(setOfDigits, 100*time.Millisecond)

Get spinner status

fmt.Println(s.Active())

Unix pipe and redirect

Feature suggested and write up by dekz

Setting the Spinner Writer to Stderr helps show progress to the user, with the enhancement to chain, pipe or redirect the output.

This is the preferred method of setting a Writer at this time.

s := spinner.New(spinner.CharSets[11], 100*time.Millisecond, spinner.WithWriter(os.Stderr))
s.Suffix = " Encrypting data..."
s.Start()
// Encrypt the data into ciphertext
fmt.Println(os.Stdout, ciphertext)

> myprog encrypt "Secret text" > encrypted.txt
⣯ Encrypting data...

> cat encrypted.txt
1243hjkbas23i9ah27sj39jghv237n2oa93hg83

Final String Output

Add additional output when the spinner/indicator has completed. The "final" output string can be multi-lined and will be written to wherever the io.Writer has been configured for.

s := spinner.New(spinner.CharSets[9], 100*time.Millisecond)
s.FinalMSG = "Complete!\nNew line!\nAnother one!\n"
s.Start()                 
time.Sleep(4 * time.Second)
s.Stop()                   

Output

Complete!
New line!
Another one!

Documentation

Overview

Package spinner is a simple package to add a spinner / progress indicator to any terminal application.

Index

• Variables
• func GenerateNumberSequence(length int) []string
• type Option
  • func WithColor(color string) Option
  • func WithFinalMSG(finalMsg string) Option
  • func WithHiddenCursor(hideCursor bool) Option
  • func WithSuffix(suffix string) Option
  • func WithWriter(w io.Writer) Option
• type Options
• type Spinner
  • func New(parent context.Context, cs []string, d time.Duration, options ...Option) *Spinner
  • func (s *Spinner) Active() bool
  • func (s *Spinner) Color(colors ...string) error
  • func (s *Spinner) Lock()
  • func (s *Spinner) Restart()
  • func (s *Spinner) Reverse()
  • func (s *Spinner) Start()
  • func (s *Spinner) Stop()
  • func (s *Spinner) Unlock()
  • func (s *Spinner) UpdateCharSet(cs []string)
  • func (s *Spinner) UpdateSpeed(d time.Duration)

Variables

var CharSets = map[int][]string{
	0:  {"←", "↖", "↑", "↗", "→", "↘", "↓", "↙"},
	1:  {"▁", "▃", "▄", "▅", "▆", "▇", "█", "▇", "▆", "▅", "▄", "▃", "▁"},
	2:  {"▖", "▘", "▝", "▗"},
	3:  {"┤", "┘", "┴", "└", "├", "┌", "┬", "┐"},
	4:  {"◢", "◣", "◤", "◥"},
	5:  {"◰", "◳", "◲", "◱"},
	6:  {"◴", "◷", "◶", "◵"},
	7:  {"◐", "◓", "◑", "◒"},
	8:  {".", "o", "O", "@", "*"},
	9:  {"|", "/", "-", "\\"},
	10: {"◡◡", "⊙⊙", "◠◠"},
	11: {"⣾", "⣽", "⣻", "⢿", "⡿", "⣟", "⣯", "⣷"},
	12: {">))'>", " >))'>", "  >))'>", "   >))'>", "    >))'>", "   <'((<", "  <'((<", " <'((<"},
	13: {"⠁", "⠂", "⠄", "⡀", "⢀", "⠠", "⠐", "⠈"},
	14: {"⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"},
	15: {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"},
	16: {"▉", "▊", "▋", "▌", "▍", "▎", "▏", "▎", "▍", "▌", "▋", "▊", "▉"},
	17: {"■", "□", "▪", "▫"},
	18: {"←", "↑", "→", "↓"},
	19: {"╫", "╪"},
	20: {"⇐", "⇖", "⇑", "⇗", "⇒", "⇘", "⇓", "⇙"},
	21: {"⠁", "⠁", "⠉", "⠙", "⠚", "⠒", "⠂", "⠂", "⠒", "⠲", "⠴", "⠤", "⠄", "⠄", "⠤", "⠠", "⠠", "⠤", "⠦", "⠖", "⠒", "⠐", "⠐", "⠒", "⠓", "⠋", "⠉", "⠈", "⠈"},
	22: {"⠈", "⠉", "⠋", "⠓", "⠒", "⠐", "⠐", "⠒", "⠖", "⠦", "⠤", "⠠", "⠠", "⠤", "⠦", "⠖", "⠒", "⠐", "⠐", "⠒", "⠓", "⠋", "⠉", "⠈"},
	23: {"⠁", "⠉", "⠙", "⠚", "⠒", "⠂", "⠂", "⠒", "⠲", "⠴", "⠤", "⠄", "⠄", "⠤", "⠴", "⠲", "⠒", "⠂", "⠂", "⠒", "⠚", "⠙", "⠉", "⠁"},
	24: {"⠋", "⠙", "⠚", "⠒", "⠂", "⠂", "⠒", "⠲", "⠴", "⠦", "⠖", "⠒", "⠐", "⠐", "⠒", "⠓", "⠋"},
	25: {"ｦ", "ｧ", "ｨ", "ｩ", "ｪ", "ｫ", "ｬ", "ｭ", "ｮ", "ｯ", "ｱ", "ｲ", "ｳ", "ｴ", "ｵ", "ｶ", "ｷ", "ｸ", "ｹ", "ｺ", "ｻ", "ｼ", "ｽ", "ｾ", "ｿ", "ﾀ", "ﾁ", "ﾂ", "ﾃ", "ﾄ", "ﾅ", "ﾆ", "ﾇ", "ﾈ", "ﾉ", "ﾊ", "ﾋ", "ﾌ", "ﾍ", "ﾎ", "ﾏ", "ﾐ", "ﾑ", "ﾒ", "ﾓ", "ﾔ", "ﾕ", "ﾖ", "ﾗ", "ﾘ", "ﾙ", "ﾚ", "ﾛ", "ﾜ", "ﾝ"},
	26: {".", "..", "..."},
	27: {"▁", "▂", "▃", "▄", "▅", "▆", "▇", "█", "▉", "▊", "▋", "▌", "▍", "▎", "▏", "▏", "▎", "▍", "▌", "▋", "▊", "▉", "█", "▇", "▆", "▅", "▄", "▃", "▂", "▁"},
	28: {".", "o", "O", "°", "O", "o", "."},
	29: {"+", "x"},
	30: {"v", "<", "^", ">"},
	31: {">>--->", " >>--->", "  >>--->", "   >>--->", "    >>--->", "    <---<<", "   <---<<", "  <---<<", " <---<<", "<---<<"},
	32: {"|", "||", "|||", "||||", "|||||", "|||||||", "||||||||", "|||||||", "||||||", "|||||", "||||", "|||", "||", "|"},
	33: {"[          ]", "[=         ]", "[==        ]", "[===       ]", "[====      ]", "[=====     ]", "[======    ]", "[=======   ]", "[========  ]", "[========= ]", "[==========]"},
	34: {"(*---------)", "(-*--------)", "(--*-------)", "(---*------)", "(----*-----)", "(-----*----)", "(------*---)", "(-------*--)", "(--------*-)", "(---------*)"},
	35: {"█▒▒▒▒▒▒▒▒▒", "███▒▒▒▒▒▒▒", "█████▒▒▒▒▒", "███████▒▒▒", "██████████"},
	36: {"[                    ]", "[=>                  ]", "[===>                ]", "[=====>              ]", "[======>             ]", "[========>           ]", "[==========>         ]", "[============>       ]", "[==============>     ]", "[================>   ]", "[==================> ]", "[===================>]"},
	39: {"🌍", "🌎", "🌏"},
	40: {"◜", "◝", "◞", "◟"},
	41: {"⬒", "⬔", "⬓", "⬕"},
	42: {"⬖", "⬘", "⬗", "⬙"},
	43: {"[>>>          >]", "[]>>>>        []", "[]  >>>>      []", "[]    >>>>    []", "[]      >>>>  []", "[]        >>>>[]", "[>>          >>]"},
	44: {"♠", "♣", "♥", "♦"},
	45: {"➞", "➟", "➠", "➡", "➠", "➟"},
	46: {"  |  ", ` \   `, "_    ", ` \   `, "  |  ", "   / ", "    _", "   / "},
	47: {"  . . . .", ".   . . .", ". .   . .", ". . .   .", ". . . .  ", ". . . . ."},
	48: {" |     ", "  /    ", "   _   ", `    \  `, "     | ", `    \  `, "   _   ", "  /    "},
	49: {"⎺", "⎻", "⎼", "⎽", "⎼", "⎻"},
	50: {"▹▹▹▹▹", "▸▹▹▹▹", "▹▸▹▹▹", "▹▹▸▹▹", "▹▹▹▸▹", "▹▹▹▹▸"},
	51: {"[    ]", "[   =]", "[  ==]", "[ ===]", "[====]", "[=== ]", "[==  ]", "[=   ]"},
	52: {"( ●    )", "(  ●   )", "(   ●  )", "(    ● )", "(     ●)", "(    ● )", "(   ●  )", "(  ●   )", "( ●    )"},
	53: {"✶", "✸", "✹", "✺", "✹", "✷"},
	54: {"▐|\\____________▌", "▐_|\\___________▌", "▐__|\\__________▌", "▐___|\\_________▌", "▐____|\\________▌", "▐_____|\\_______▌", "▐______|\\______▌", "▐_______|\\_____▌", "▐________|\\____▌", "▐_________|\\___▌", "▐__________|\\__▌", "▐___________|\\_▌", "▐____________|\\▌", "▐____________/|▌", "▐___________/|_▌", "▐__________/|__▌", "▐_________/|___▌", "▐________/|____▌", "▐_______/|_____▌", "▐______/|______▌", "▐_____/|_______▌", "▐____/|________▌", "▐___/|_________▌", "▐__/|__________▌", "▐_/|___________▌", "▐/|____________▌"},
	55: {"▐⠂       ▌", "▐⠈       ▌", "▐ ⠂      ▌", "▐ ⠠      ▌", "▐  ⡀     ▌", "▐  ⠠     ▌", "▐   ⠂    ▌", "▐   ⠈    ▌", "▐    ⠂   ▌", "▐    ⠠   ▌", "▐     ⡀  ▌", "▐     ⠠  ▌", "▐      ⠂ ▌", "▐      ⠈ ▌", "▐       ⠂▌", "▐       ⠠▌", "▐       ⡀▌", "▐      ⠠ ▌", "▐      ⠂ ▌", "▐     ⠈  ▌", "▐     ⠂  ▌", "▐    ⠠   ▌", "▐    ⡀   ▌", "▐   ⠠    ▌", "▐   ⠂    ▌", "▐  ⠈     ▌", "▐  ⠂     ▌", "▐ ⠠      ▌", "▐ ⡀      ▌", "▐⠠       ▌"},
	56: {"¿", "?"},
	57: {"⢹", "⢺", "⢼", "⣸", "⣇", "⡧", "⡗", "⡏"},
	58: {"⢄", "⢂", "⢁", "⡁", "⡈", "⡐", "⡠"},
	59: {".  ", ".. ", "...", " ..", "  .", "   "},
	60: {".", "o", "O", "°", "O", "o", "."},
	61: {"▓", "▒", "░"},
	62: {"▌", "▀", "▐", "▄"},
	63: {"⊶", "⊷"},
	64: {"▪", "▫"},
	65: {"□", "■"},
	66: {"▮", "▯"},
	67: {"-", "=", "≡"},
	68: {"d", "q", "p", "b"},
	69: {"∙∙∙", "●∙∙", "∙●∙", "∙∙●", "∙∙∙"},
	70: {"🌑 ", "🌒 ", "🌓 ", "🌔 ", "🌕 ", "🌖 ", "🌗 ", "🌘 "},
	71: {"☗", "☖"},
	72: {"⧇", "⧆"},
	73: {"◉", "◎"},
	74: {"㊂", "㊀", "㊁"},
	75: {"⦾", "⦿"},
	76: {"ဝ", "၀"},
	77: {"▌", "▀", "▐▄"},
}

CharSets contains the available character sets

Functions

func GenerateNumberSequence

func GenerateNumberSequence(length int) []string

GenerateNumberSequence will generate a slice of integers at the provided length and convert them each to a string.

Types

type Option

type Option func(*Spinner)

Option is a function that takes a spinner and applies a given configuration.

func WithColor

func WithColor(color string) Option

WithColor adds the given color to the spinner.

func WithFinalMSG

func WithFinalMSG(finalMsg string) Option

WithFinalMSG adds the given string ot the spinner as the final message to be written.

func WithHiddenCursor

func WithHiddenCursor(hideCursor bool) Option

WithHiddenCursor hides the cursor if hideCursor = true given.

func WithSuffix

func WithSuffix(suffix string) Option

WithSuffix adds the given string to the spinner as the suffix.

func WithWriter

func WithWriter(w io.Writer) Option

WithWriter adds the given writer to the spinner. This function should be favored over directly assigning to the struct value.

type Options

type Options struct {
	Color      string
	Suffix     string
	FinalMSG   string
	HideCursor bool
}

Options contains fields to configure the spinner.

type Spinner

type Spinner struct {
	Delay time.Duration // Delay is the speed of the indicator

	Prefix   string // Prefix is the text preppended to the indicator
	Suffix   string // Suffix is the text appended to the indicator
	FinalMSG string // string displayed after Stop() is called

	Writer io.Writer // to make testing better, exported so users have access. Use `WithWriter` to update after initialization.

	HideCursor bool             // hideCursor determines if the cursor is visible
	PreUpdate  func(s *Spinner) // will be triggered before every spinner update
	PostUpdate func(s *Spinner) // will be triggered after every spinner update
	// contains filtered or unexported fields
}

Spinner struct to hold the provided options.

func New

func New(parent context.Context, cs []string, d time.Duration, options ...Option) *Spinner

New provides a pointer to an instance of Spinner with the supplied options.

func (*Spinner) Active

func (s *Spinner) Active() bool

Active will return whether or not the spinner is currently active.

func (*Spinner) Color

func (s *Spinner) Color(colors ...string) error

Color will set the struct field for the given color to be used.

func (*Spinner) Lock

func (s *Spinner) Lock()

Lock allows for manual control to lock the spinner.

func (*Spinner) Restart

func (s *Spinner) Restart()

Restart will stop and start the indicator.

func (*Spinner) Reverse

func (s *Spinner) Reverse()

Reverse will reverse the order of the slice assigned to the indicator.

func (*Spinner) Start

func (s *Spinner) Start()

Start will start the indicator.

func (*Spinner) Stop

func (s *Spinner) Stop()

Stop stops the indicator.

func (*Spinner) Unlock

func (s *Spinner) Unlock()

Unlock allows for manual control to unlock the spinner.

func (*Spinner) UpdateCharSet

func (s *Spinner) UpdateCharSet(cs []string)

UpdateCharSet will change the current character set to the given one.

func (*Spinner) UpdateSpeed

func (s *Spinner) UpdateSpeed(d time.Duration)

UpdateSpeed will set the indicator delay to the given value.