epuppy/cmd/pager.go

package cmd

// pager setup using bubbletea
// file shamlelessly copied from:
// https://github.com/charmbracelet/bubbletea/tree/main/examples/pager

import (
	"fmt"
	"os"
	"strings"

	"github.com/charmbracelet/bubbles/viewport"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
	"github.com/muesli/reflow/wordwrap"
	"golang.org/x/term"
)

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.BorderStyle(b)
	}()

	viewstyle = lipgloss.NewStyle()
)

type Meta struct {
	lines           int
	currentline     int
	initialprogress int
	document        string
}

type Doc struct {
	content      string
	title        string
	ready        bool
	viewport     viewport.Model
	initialwidth int
	meta         *Meta
}

func (m Doc) Init() tea.Cmd {
	return nil
}

func (m Doc) 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(wordwrap.String(m.content, m.initialwidth))
			m.viewport.ScrollDown(m.meta.initialprogress)

			m.ready = true
		} else {
			m.viewport.Width = msg.Width
			m.viewport.Height = msg.Height - verticalMarginHeight
			m.viewport.SetContent(wordwrap.String(m.content, msg.Width))
		}
	}

	// 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 Doc) View() string {
	if !m.ready {
		return "\n  Initializing..."
	}

	// update current line for later saving
	// FIXME: doesn't work correctly yet
	m.meta.currentline = int(float64(m.meta.lines) * m.viewport.ScrollPercent())

	return fmt.Sprintf("%s\n%s\n%s", m.headerView(), m.viewport.View(), m.footerView())
}

func (m Doc) headerView() string {
	title := titleStyle.Render(m.title)
	line := strings.Repeat("─", max(0, m.viewport.Width-lipgloss.Width(title)))
	return lipgloss.JoinHorizontal(lipgloss.Center, title, line)
}

func (m Doc) 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 Pager(conf *Config, title, message string) (int, error) {
	width := 80
	scrollto := 0

	if term.IsTerminal(int(os.Stdout.Fd())) {
		w, _, err := term.GetSize(0)
		if err == nil {
			width = w
		}
	}

	if conf.StoreProgress {
		scrollto = conf.InitialProgress
	}

	meta := Meta{
		initialprogress: scrollto,
		lines:           len(strings.Split(message, "\r\n")),
	}

	p := tea.NewProgram(
		Doc{content: message, title: title, initialwidth: width, meta: &meta},
		tea.WithAltScreen(),       // use the full size of the terminal in its "alternate screen buffer"
		tea.WithMouseCellMotion(), // turn on mouse support so we can track the mouse wheel
	)

	if _, err := p.Run(); err != nil {
		return 0, fmt.Errorf("could not run pager:", err)
	}

	if conf.Debug {
		fmt.Printf("scrollto: %d, last: %d, diff: %d\n",
			scrollto, meta.currentline, scrollto-meta.currentline)
	}

	return meta.currentline, nil
}