Tea

茶! The fun, functional way to build terminal apps. A Go framework based on The Elm Architecture.

Simple example

package main

// A simple program that counts down from 5 and then exits.

import (
	"fmt"
	"log"
	"time"
	"github.com/charmbracelet/tea"
)

type model int

type tickMsg struct{}

func main() {
	err := tea.NewProgram(model(5), update, view, []tea.Sub{tick}).Start()
	if err != nil {
		log.Fatal(err)
	}
}

func update(msg tea.Msg, mdl tea.Model) (tea.Model, tea.Cmd) {
	m, _ := mdl.(model)

	switch msg.(type) {
	case tickMsg:
		m -= 1
		if m <= 0 {
			return m, tea.Quit
		}
	}
	return m, nil
}

func view(mdl tea.Model) string {
	m, _ := mdl.(model)
	return fmt.Sprintf("Hi. This program will exit in %d seconds...\n", m)
}

func tick(_ tea.Model) tea.Msg {
	time.Sleep(time.Second)
	return tickMsg{}
}

Hungry for more? See the other examples.

Credit

Heavily inspired by both The Elm Architecture by Evan Czaplicki et al. and go-tea by TJ Holowaychuk.

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Part of Charm. For more info see ssh charm.sh. Charm热爱开源!