forked from Mirrors/bubbletea
73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
package main
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// A simple program that counts down from 5 and then exits.
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import (
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"fmt"
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"log"
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"os"
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"time"
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tea "github.com/charmbracelet/bubbletea"
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)
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func main() {
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// Log to a file. Useful in debugging since you can't really log to stdout.
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// Not required.
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logfilePath := os.Getenv("BUBBLETEA_LOG")
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if logfilePath != "" {
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if _, err := tea.LogToFile(logfilePath, "simple"); err != nil {
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log.Fatal(err)
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}
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}
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// Initialize our program
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p := tea.NewProgram(model(5))
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if err := p.Start(); err != nil {
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log.Fatal(err)
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}
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}
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// A model can be more or less any type of data. It holds all the data for a
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// program, so often it's a struct. For this simple example, however, all
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// we'll need is a simple integer.
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type model int
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// Init optionally returns an initial command we should run. In this case we
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// want to start the timer.
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func (m model) Init() tea.Cmd {
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return tick
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}
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// Update is called when messages are received. The idea is that you inspect the
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// message and send back an updated model accordingly. You can also return
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// a command, which is a function that performs I/O and returns a message.
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func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
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switch msg.(type) {
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case tea.KeyMsg:
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return m, tea.Quit
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case tickMsg:
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m -= 1
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if m <= 0 {
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return m, tea.Quit
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}
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return m, tick
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}
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return m, nil
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}
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// Views return a string based on data in the model. That string which will be
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// rendered to the terminal.
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func (m model) View() string {
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return fmt.Sprintf("Hi. This program will exit in %d seconds. To quit sooner press any key.\n", m)
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}
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// Messages are events that we respond to in our Update function. This
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// particular one indicates that the timer has ticked.
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type tickMsg time.Time
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func tick() tea.Msg {
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time.Sleep(time.Second)
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return tickMsg{}
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}
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