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119 lines
2.9 KiB
Go
119 lines
2.9 KiB
Go
package spinner
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import (
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"time"
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tea "github.com/charmbracelet/bubbletea"
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"github.com/muesli/termenv"
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)
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// Spinner is a set of frames used in animating the spinner.
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type Spinner = int
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// Available types of spinners
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const (
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Line Spinner = iota
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Dot
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)
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const (
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defaultFPS = 9
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)
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var (
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// Spinner frames
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spinners = map[Spinner][]string{
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Line: {"|", "/", "-", "\\"},
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Dot: {"⣾ ", "⣽ ", "⣻ ", "⢿ ", "⡿ ", "⣟ ", "⣯ ", "⣷ "},
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}
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color = termenv.ColorProfile().Color
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)
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// Model contains the state for the spinner. Use NewModel to create new models
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// rather than using Model as a struct literal.
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type Model struct {
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// Type is the set of frames to use. See Spinner.
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Type Spinner
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// FPS is the speed at which the ticker should tick
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FPS int
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// ForegroundColor sets the background color of the spinner. It can be a
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// hex code or one of the 256 ANSI colors. If the terminal emulator can't
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// doesn't support the color specified it will automatically degrade
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// (per github.com/muesli/termenv).
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ForegroundColor string
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// BackgroundColor sets the background color of the spinner. It can be a
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// hex code or one of the 256 ANSI colors. If the terminal emulator can't
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// doesn't support the color specified it will automatically degrade
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// (per github.com/muesli/termenv).
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BackgroundColor string
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// CustomMsgFunc can be used to a custom message on tick. This can be
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// useful when you have spinners in different parts of your application and
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// want to differentiate between the messages for clarity and simplicity.
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// If nil, this setting is ignored.
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CustomMsgFunc func() tea.Msg
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frame int
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}
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// NewModel returns a model with default values.
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func NewModel() Model {
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return Model{
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Type: Line,
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FPS: defaultFPS,
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}
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}
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// TickMsg indicates that the timer has ticked and we should render a frame.
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type TickMsg struct{}
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// Update is the Tea update function. This will advance the spinner one frame
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// every time it's called, regardless the message passed, so be sure the logic
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// is setup so as not to call this Update needlessly.
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func Update(msg tea.Msg, m Model) (Model, tea.Cmd) {
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m.frame++
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if m.frame >= len(spinners[m.Type]) {
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m.frame = 0
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}
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if m.CustomMsgFunc != nil {
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return m, Tick(m)
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}
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return m, Tick(m)
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}
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// View renders the model's view.
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func View(model Model) string {
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s := spinners[model.Type]
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if model.frame >= len(s) {
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return "[error]"
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}
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str := s[model.frame]
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if model.ForegroundColor != "" || model.BackgroundColor != "" {
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return termenv.
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String(str).
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Foreground(color(model.ForegroundColor)).
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Background(color(model.BackgroundColor)).
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String()
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}
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return str
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}
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// Tick is the command used to advance the spinner one frame.
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func Tick(model Model) tea.Cmd {
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return func() tea.Msg {
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time.Sleep(time.Second / time.Duration(model.FPS))
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if model.CustomMsgFunc != nil {
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return model.CustomMsgFunc()
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}
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return TickMsg{}
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}
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}
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