bubbles/timer/timer.go
Carlos Alexandro Becker 7941c49504
feat: simple timer component (#67)
* feat: simple timer component

Signed-off-by: Carlos Alexandro Becker <caarlos0@gmail.com>
2021-09-09 15:17:33 -04:00

69 lines
1.4 KiB
Go

// Package timer provides a simple timeout component.
package timer
import (
"time"
tea "github.com/charmbracelet/bubbletea"
)
// TickMsg is a message that is sent on every timer tick.
type TickMsg struct{}
// TimeoutMsg is a message that is sent once when the timer times out.
type TimeoutMsg struct{}
// Model of the timer component.
type Model struct {
// How long until the timer expires.
Timeout time.Duration
// How long to wait before every tick. Defaults to 1 second.
Interval time.Duration
}
// NewWithInterval creates a new timer with the given timeout and tick interval.
func NewWithInterval(timeout, interval time.Duration) Model {
return Model{
Timeout: timeout,
Interval: interval,
}
}
// New creates a new timer with the given timeout and default 1s interval.
func New(timeout time.Duration) Model {
return NewWithInterval(timeout, time.Second)
}
// Init starts the timer.
func (m Model) Init() tea.Cmd {
return tick(m.Interval)
}
// Update handles the timer tick.
func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
switch msg.(type) {
case TickMsg:
m.Timeout -= m.Interval
if m.Timeout <= 0 {
return m, func() tea.Msg {
return TimeoutMsg{}
}
}
return m, tick(m.Interval)
}
return m, nil
}
// View of the timer component.
func (m Model) View() string {
return m.Timeout.String()
}
func tick(d time.Duration) tea.Cmd {
return tea.Tick(d, func(_ time.Time) tea.Msg {
return TickMsg{}
})
}