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tui.go
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tui.go
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package main
import (
"context"
"errors"
"fmt"
"io"
"os"
"strings"
"time"
"github.com/charmbracelet/bubbles/list"
"github.com/charmbracelet/bubbles/progress"
tea "github.com/charmbracelet/bubbletea"
"github.com/charmbracelet/lipgloss"
)
var (
titleStyle = lipgloss.NewStyle().MarginLeft(2)
itemStyle = lipgloss.NewStyle().PaddingLeft(4)
selectedItemStyle = lipgloss.NewStyle().PaddingLeft(2).Foreground(lipgloss.Color("027"))
paginationStyle = list.DefaultStyles().PaginationStyle.PaddingLeft(4)
helpStyle = list.DefaultStyles().HelpStyle.PaddingLeft(4).PaddingBottom(1)
quitTextStyle = lipgloss.NewStyle().Margin(1, 0, 1, 4)
progressStyle = lipgloss.NewStyle().MarginLeft(4)
)
type State int
const (
Choosing State = iota
Downloading
Extracting
Quitting
Completed
)
type item string
type doneMsg struct{}
type progressMsg float64
type statusMsg State
type errMsg struct{ err error }
func downloadCmd(m *model) tea.Cmd {
return func() tea.Msg {
var err error
var dlf File
for _, v := range m.versions {
if m.choice == v.Version {
l := v.Files.Filter(
func(f File) bool { return f.Os == "linux" },
func(f File) bool { return f.Arch == "amd64" },
)
if len(l) > 0 {
dlf = l[0]
}
}
}
if dlf == (File{}) {
return errMsg{errors.New("did not found a matching file")}
}
m.file, err = os.CreateTemp("", "go-dl-tmp.tar.gz")
if err != nil {
return errMsg{err}
}
err = m.repo.Download(m.ctx, dlf, m.file)
if err != nil {
return errMsg{err}
}
return nil
}
}
func extractCmd(m *model) tea.Cmd {
return func() tea.Msg {
var err error
defer m.file.Close()
_, err = m.file.Seek(0, io.SeekStart)
if err != nil {
return errMsg{err}
}
err = os.RemoveAll("/usr/local/go")
if err != nil {
return errMsg{err}
}
err = Decompress("/usr/local", m.file, m.repo.onProgress)
if err != nil {
return errMsg{err}
}
return doneMsg{}
}
}
func statusCmd(s State) tea.Cmd {
return func() tea.Msg {
return statusMsg(s)
}
}
func finalPause() tea.Cmd {
return tea.Tick(time.Millisecond*750, func(_ time.Time) tea.Msg {
return nil
})
}
func (i item) FilterValue() string { return "" }
type itemDelegate struct{}
func (d itemDelegate) Height() int { return 1 }
func (d itemDelegate) Spacing() int { return 0 }
func (d itemDelegate) Update(_ tea.Msg, _ *list.Model) tea.Cmd { return nil }
func (d itemDelegate) Render(w io.Writer, m list.Model, index int, listItem list.Item) {
i, ok := listItem.(item)
if !ok {
return
}
str := fmt.Sprintf("%d. %s", index+1, i)
fn := itemStyle.Render
if index == m.Index() {
fn = func(s ...string) string {
return selectedItemStyle.Render("> " + strings.Join(s, " "))
}
}
fmt.Fprint(w, fn(str))
}
type model struct {
err error
ctx context.Context
list list.Model
choice string
progress progress.Model
repo *GoRepository
versions []Release
file *os.File
status State
}
func (m model) Init() tea.Cmd {
return nil
}
func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
switch msg := msg.(type) {
case tea.WindowSizeMsg:
m.list.SetWidth(msg.Width)
return m, nil
case tea.KeyMsg:
switch keypress := msg.String(); keypress {
case "ctrl+c":
m.status = Quitting
return m, tea.Quit
case "enter":
i, ok := m.list.SelectedItem().(item)
if ok {
m.choice = string(i)
}
return m, tea.Sequence(
statusCmd(Downloading),
downloadCmd(&m),
statusCmd(Extracting),
extractCmd(&m),
)
}
case statusMsg:
m.status = State(msg)
return m, nil
case errMsg:
m.err = msg.err
return m, tea.Quit
case doneMsg:
m.status = Completed
return m, tea.Sequence(finalPause(), tea.Quit)
case progressMsg:
var cmds []tea.Cmd
if msg >= 1.0 {
cmds = append(cmds, tea.Sequence(finalPause()))
}
cmds = append(cmds, m.progress.SetPercent(float64(msg)))
return m, tea.Batch(cmds...)
case progress.FrameMsg:
progressModel, cmd := m.progress.Update(msg)
m.progress = progressModel.(progress.Model)
return m, cmd
}
var cmd tea.Cmd
m.list, cmd = m.list.Update(msg)
return m, cmd
}
func (m model) View() string {
if m.err != nil {
return quitTextStyle.Render(fmt.Sprintf("something went wrong: %v", m.err))
}
if m.status == Downloading {
return lipgloss.JoinVertical(
lipgloss.Left,
quitTextStyle.Render(fmt.Sprintf("Downloading: %s", m.choice)),
progressStyle.Render(m.progress.View()),
"",
)
}
if m.status == Extracting {
return lipgloss.JoinVertical(
lipgloss.Left,
quitTextStyle.Render(fmt.Sprintf("Extracting: %s", m.choice)),
progressStyle.Render(m.progress.View()),
"",
)
}
if m.status == Completed {
return lipgloss.JoinVertical(
lipgloss.Left,
quitTextStyle.Render(fmt.Sprintf("Completed download and extraction of %s !", m.choice)),
progressStyle.Render(m.progress.View()),
"",
)
}
if m.status == Quitting {
return quitTextStyle.Render("exiting..")
}
return "\n" + m.list.View()
}