forked from Mirrors/bubbletea
69 lines
1.7 KiB
Go
69 lines
1.7 KiB
Go
package main
|
|
|
|
// A simple program that counts down from 5 and then exits.
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
"time"
|
|
|
|
"github.com/charmbracelet/boba"
|
|
)
|
|
|
|
// A model can be more or less any type of data. It holds all the data for a
|
|
// program, so often it's a struct. For this simple example, however, all
|
|
// we'll need is a simple integer.
|
|
type Model int
|
|
|
|
// Messages are events that we respond to in our Update function. This
|
|
// particular one indicates that the timer has ticked.
|
|
type tickMsg time.Time
|
|
|
|
func main() {
|
|
// Initialize our program
|
|
p := boba.NewProgram(initialize, update, view, subscriptions)
|
|
if err := p.Start(); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|
|
|
|
func initialize() (boba.Model, boba.Cmd) {
|
|
return Model(5), nil
|
|
}
|
|
|
|
// Update is called when messages are recived. The idea is that you inspect
|
|
// the message and update the model (or send back a new one) accordingly. You
|
|
// can also return a commmand, which is a function that peforms I/O and
|
|
// returns a message.
|
|
func update(msg boba.Msg, model boba.Model) (boba.Model, boba.Cmd) {
|
|
m, _ := model.(Model)
|
|
|
|
switch msg.(type) {
|
|
case boba.KeyMsg:
|
|
return m, boba.Quit
|
|
case tickMsg:
|
|
m -= 1
|
|
if m <= 0 {
|
|
return m, boba.Quit
|
|
}
|
|
}
|
|
return m, nil
|
|
}
|
|
|
|
// Views take data from the model and return a string which will be rendered
|
|
// to the terminal.
|
|
func view(model boba.Model) string {
|
|
m, _ := model.(Model)
|
|
return fmt.Sprintf("Hi. This program will exit in %d seconds. To quit sooner press any key.", m)
|
|
}
|
|
|
|
// This is a subscription which we setup in NewProgram(). It waits for one
|
|
// second, sends a tick, and then restarts.
|
|
func subscriptions(_ boba.Model) boba.Subs {
|
|
return boba.Subs{
|
|
"tick": boba.Every(time.Second, func(t time.Time) boba.Msg {
|
|
return tickMsg(t)
|
|
}),
|
|
}
|
|
}
|