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feat: support for interactive reading (#85)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| package internal | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "github.com/charmbracelet/bubbles/viewport" | ||
| tea "github.com/charmbracelet/bubbletea" | ||
| "github.com/charmbracelet/lipgloss" | ||
| "os" | ||
| "strings" | ||
| ) | ||
|
|
||
| var ( | ||
| titleStyle = func() lipgloss.Style { | ||
| b := lipgloss.RoundedBorder() | ||
| b.Right = "├" | ||
| return lipgloss.NewStyle().BorderStyle(b).Padding(0, 1) | ||
| }() | ||
|
|
||
| infoStyle = func() lipgloss.Style { | ||
| b := lipgloss.RoundedBorder() | ||
| b.Left = "┤" | ||
| return titleStyle.Copy().BorderStyle(b) | ||
| }() | ||
| ) | ||
|
|
||
| type model struct { | ||
| content string | ||
| ready bool | ||
| viewport viewport.Model | ||
| } | ||
|
|
||
| func (m model) Init() tea.Cmd { | ||
| return nil | ||
| } | ||
|
|
||
| func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) { | ||
| var ( | ||
| cmd tea.Cmd | ||
| cmds []tea.Cmd | ||
| ) | ||
|
|
||
| switch msg := msg.(type) { | ||
| case tea.KeyMsg: | ||
| if k := msg.String(); k == "ctrl+c" || k == "q" || k == "esc" { | ||
| return m, tea.Quit | ||
| } | ||
|
|
||
| case tea.WindowSizeMsg: | ||
| headerHeight := lipgloss.Height(m.headerView()) | ||
| footerHeight := lipgloss.Height(m.footerView()) | ||
| verticalMarginHeight := headerHeight + footerHeight | ||
|
|
||
| if !m.ready { | ||
| // Since this program is using the full size of the viewport we | ||
| // need to wait until we've received the window dimensions before | ||
| // we can initialize the viewport. The initial dimensions come in | ||
| // quickly, though asynchronously, which is why we wait for them | ||
| // here. | ||
| m.viewport = viewport.New(msg.Width, msg.Height-verticalMarginHeight) | ||
| m.viewport.YPosition = headerHeight | ||
| m.viewport.SetContent(m.content) | ||
| m.ready = true | ||
|
|
||
| // This is only necessary for high performance rendering, which in | ||
| // most cases you won't need. | ||
| // | ||
| // Render the viewport one line below the header. | ||
| m.viewport.YPosition = headerHeight + 1 | ||
| } else { | ||
| m.viewport.Width = msg.Width | ||
| m.viewport.Height = msg.Height - verticalMarginHeight | ||
| } | ||
|
|
||
| } | ||
|
|
||
| // Handle keyboard and mouse events in the viewport | ||
| m.viewport, cmd = m.viewport.Update(msg) | ||
| cmds = append(cmds, cmd) | ||
|
|
||
| return m, tea.Batch(cmds...) | ||
| } | ||
|
|
||
| func (m model) View() string { | ||
| if !m.ready { | ||
| return "\n Initializing..." | ||
| } | ||
| return fmt.Sprintf("%s\n%s\n%s", m.headerView(), m.viewport.View(), m.footerView()) | ||
| } | ||
|
|
||
| func (m model) headerView() string { | ||
| return lipgloss.JoinHorizontal(lipgloss.Center) | ||
| } | ||
|
|
||
| func (m model) footerView() string { | ||
| info := infoStyle.Render(fmt.Sprintf("%3.f%%", m.viewport.ScrollPercent()*100)) | ||
| line := strings.Repeat("─", max(0, m.viewport.Width-lipgloss.Width(info))) | ||
| return lipgloss.JoinHorizontal(lipgloss.Center, line, info) | ||
| } | ||
|
|
||
| func max(a, b int) int { | ||
| if a > b { | ||
| return a | ||
| } | ||
| return b | ||
| } | ||
|
|
||
| func rendering(interactive bool, s string) { | ||
| if !interactive { | ||
| fmt.Print(s) | ||
| return | ||
| } | ||
|
|
||
| p := tea.NewProgram( | ||
| model{content: s}, | ||
| tea.WithAltScreen(), | ||
| tea.WithMouseCellMotion(), | ||
| ) | ||
|
|
||
| if _, err := p.Run(); err != nil { | ||
| fmt.Println("could not run program:", err) | ||
| os.Exit(1) | ||
| } | ||
| } |
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