143 lines
3.4 KiB
Go
143 lines
3.4 KiB
Go
/*
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* LURE - Linux User REpository
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* Copyright (C) 2023 Arsen Musayelyan
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package pager
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import (
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"fmt"
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"strings"
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"github.com/charmbracelet/bubbles/viewport"
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tea "github.com/charmbracelet/bubbletea"
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"github.com/charmbracelet/lipgloss"
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"github.com/muesli/reflow/wordwrap"
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)
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var (
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titleStyle lipgloss.Style
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infoStyle lipgloss.Style
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)
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func init() {
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b := lipgloss.RoundedBorder()
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b.Right = "\u251C"
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titleStyle = lipgloss.NewStyle().BorderStyle(b).Padding(0, 1)
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b = lipgloss.RoundedBorder()
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b.Left = "\u2524"
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infoStyle = titleStyle.Copy().BorderStyle(b)
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}
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type Pager struct {
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model pagerModel
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}
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func New(name, content string) *Pager {
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return &Pager{
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model: pagerModel{
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name: name,
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content: content,
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},
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}
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}
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func (p *Pager) Run() error {
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prog := tea.NewProgram(
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p.model,
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tea.WithMouseCellMotion(),
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)
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_, err := prog.Run()
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return err
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}
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type pagerModel struct {
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name string
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content string
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ready bool
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viewport viewport.Model
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}
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func (pm pagerModel) Init() tea.Cmd {
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return tea.ClearScreen
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}
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func (pm pagerModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
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var (
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cmd tea.Cmd
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cmds []tea.Cmd
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)
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switch msg := msg.(type) {
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case tea.KeyMsg:
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k := msg.String()
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if k == "ctrl+c" || k == "q" || k == "esc" {
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return pm, tea.Quit
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}
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case tea.WindowSizeMsg:
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headerHeight := lipgloss.Height(pm.headerView())
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footerHeight := lipgloss.Height(pm.footerView())
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verticalMarginHeight := headerHeight + footerHeight
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if !pm.ready {
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pm.viewport = viewport.New(msg.Width, msg.Height-verticalMarginHeight)
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pm.viewport.HighPerformanceRendering = true
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pm.viewport.YPosition = headerHeight + 1
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pm.viewport.SetContent(wordwrap.String(pm.content, msg.Width))
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pm.ready = true
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} else {
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pm.viewport.Width = msg.Width
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pm.viewport.Height = msg.Height - verticalMarginHeight
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}
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cmds = append(cmds, viewport.Sync(pm.viewport))
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}
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// Handle keyboard and mouse events in the viewport
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pm.viewport, cmd = pm.viewport.Update(msg)
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cmds = append(cmds, cmd)
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return pm, tea.Batch(cmds...)
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}
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func (pm pagerModel) View() string {
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if !pm.ready {
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return "\n Initializing..."
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}
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return fmt.Sprintf("%s\n%s\n%s", pm.headerView(), pm.viewport.View(), pm.footerView())
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}
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func (pm pagerModel) headerView() string {
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title := titleStyle.Render(pm.name)
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line := strings.Repeat("─", max(0, pm.viewport.Width-lipgloss.Width(title)))
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return lipgloss.JoinHorizontal(lipgloss.Center, title, line)
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}
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func (pm pagerModel) footerView() string {
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info := infoStyle.Render(fmt.Sprintf("%3.f%%", pm.viewport.ScrollPercent()*100))
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line := strings.Repeat("─", max(0, pm.viewport.Width-lipgloss.Width(info)))
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return lipgloss.JoinHorizontal(lipgloss.Center, line, info)
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}
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func max(a, b int) int {
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if a > b {
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return a
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}
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return b
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}
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