charmbracelet/lipgloss sample code for #69

main.go

package main

import (
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
	"os"
)

type m struct {
	s  lipgloss.Style
	x  int
	y  int
	rr []*r
}
type r struct {
	s  lipgloss.Style
	cc []*c
}
type c struct {
	s   lipgloss.Style
	val string
}

var (
	rBase = lipgloss.NewStyle().Background(lipgloss.Color("#6c5ce7"))
	rAlt  = lipgloss.NewStyle().Background(lipgloss.Color("#0984e3"))
	sBase = lipgloss.NewStyle().Width(3).Height(1).Align(lipgloss.Center)
	sAlt  = lipgloss.NewStyle().Width(3).Height(1).Align(lipgloss.Center).Background(lipgloss.Color("#74b9ff"))
)

func main() {
	_m := m{
		s: lipgloss.NewStyle().Bold(true),
		x: 0,
		y: 0,
		rr: []*r{
			{
				s: rBase,
				cc: []*c{
					{
						s:   sBase,
						val: "a",
					},
					{
						s:   sBase,
						val: "b",
					},
				},
			},
			{
				s: rBase,
				cc: []*c{
					{
						s:   sBase,
						val: "c",
					},
					{
						s:   sBase,
						val: "d",
					},
				},
			},
		},
	}
	p := tea.NewProgram(&_m)
	if err := p.Start(); err != nil {
		os.Exit(1)
	}
}

func (_m *m) Init() tea.Cmd {
	return nil
}
func (_m *m) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {

	// Is it a key press?
	case tea.KeyMsg:
		switch msg.String() {
		case "ctrl+c", "q":
			return _m, tea.Quit
		case "up":
			if _m.y > 0 {
				_m.y--
			}
		case "down":
			if _m.y < len(_m.rr)-1 {
				_m.y++
			}
		case "left":
			if _m.x > 0 {
				_m.x--
			}
		case "right":
			if _m.x+1 < len(_m.rr[_m.y].cc) {
				_m.x++
			}
		}
	}

	return _m, nil
}

func (_m *m) View() string {
	var rScreen []string
	for ir, r := range _m.rr {
		if ir == _m.y {
			r.s = rAlt
		} else {
			r.s = rBase
		}

		cScreen := []string{}
		for ic, c := range r.cc {
			if ir == _m.y && ic == _m.x {
				c.s = sAlt.Copy().Inherit(r.s)
			} else {
				c.s = sBase.Copy().Inherit(r.s)
			}
			cScreen = append(cScreen, c.s.Render(c.val))
		}
		rScreen = append(rScreen, lipgloss.JoinHorizontal(lipgloss.Top, cScreen...))
	}
	return lipgloss.JoinVertical(lipgloss.Left, rScreen...)
}