Add Treilik-inspired example for sending value along on exit

This commit is contained in:
Christian Rocha 2020-10-14 16:46:57 -04:00
parent 51e97bb959
commit 71bd542320
No known key found for this signature in database
GPG Key ID: D6CC7A16E5878018
1 changed files with 104 additions and 0 deletions

104
examples/result/main.go Normal file
View File

@ -0,0 +1,104 @@
package main
// A simple example that shows how to retrieve a value from a Bubble Tea
// program after the Bubble Tea has exited.
//
// Thanks to Treilik for this one.
import (
"fmt"
"os"
"strings"
tea "github.com/charmbracelet/bubbletea"
)
var (
choices = []string{"Taro", "Coffee", "Lychee"}
)
type model struct {
cursor int
choice chan string
}
func main() {
// This is where we'll listen for the choice the user makes in the Bubble
// Tea program.
result := make(chan string, 1)
// Pass the channel to the initialize function so our Bubble Tea program
// can send the final choice along when the time comes.
if err := tea.NewProgram(initialize(result), update, view).Start(); err != nil {
fmt.Println("Oh no:", err)
os.Exit(1)
}
// Print out the final choice.
if r := <-result; r != "" {
fmt.Printf("\n---\nYou chose %s!\n", r)
}
}
// Pass a channel to the model to listen to the result value. This is a
// function that returns the initialize function and is typically how you would
// pass arguments to a tea.Init function.
func initialize(choice chan string) func() (tea.Model, tea.Cmd) {
return func() (tea.Model, tea.Cmd) {
return model{cursor: 0, choice: choice}, nil
}
}
func update(msg tea.Msg, mdl tea.Model) (tea.Model, tea.Cmd) {
m, _ := mdl.(model)
switch msg := msg.(type) {
case tea.KeyMsg:
switch msg.String() {
case "ctrl+c", "q":
close(m.choice) // If we're quitting just chose the channel.
return m, tea.Quit
case "enter":
// Send the choice on the channel and exit.
m.choice <- choices[m.cursor]
return m, tea.Quit
case "down", "j":
m.cursor++
if m.cursor >= len(choices) {
m.cursor = 0
}
case "up", "k":
m.cursor--
if m.cursor < 0 {
m.cursor = len(choices) - 1
}
}
}
return m, nil
}
func view(mdl tea.Model) string {
m, _ := mdl.(model)
s := strings.Builder{}
s.WriteString("What kind of Bubble Tea would you like to order?\n\n")
for i := 0; i < len(choices); i++ {
if m.cursor == i {
s.WriteString("(•) ")
} else {
s.WriteString("( ) ")
}
s.WriteString(choices[i])
s.WriteString("\n")
}
s.WriteString("\n(press q to quit)\n")
return s.String()
}