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term-pager.go
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term-pager.go
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// Copyright (c) 2015-2022 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"fmt"
"math"
"os"
"strings"
"github.com/charmbracelet/bubbles/viewport"
tea "github.com/charmbracelet/bubbletea"
"github.com/charmbracelet/lipgloss"
"github.com/muesli/reflow/wordwrap"
)
var percentStyle = lipgloss.NewStyle().Width(4).Align(lipgloss.Left)
type model struct {
viewport viewport.Model
content string
ready bool
renderedOnce chan struct{}
}
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 string:
m.content += msg
m.viewport.SetContent(wordwrap.String(m.content, m.viewport.Width-2))
case tea.KeyMsg:
switch msg.String() {
case "ctrl+c", "q", "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
close(m.renderedOnce)
} 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 {
info := " (q)uit/esc"
line := strings.Repeat("─", max(0, m.viewport.Width-lipgloss.Width(info)))
return lipgloss.JoinHorizontal(lipgloss.Center, line, info)
}
func (m model) footerView() string {
// Disables printing if the viewport is not ready
if m.viewport.Width == 0 {
return ""
}
if math.IsNaN(m.viewport.ScrollPercent()) {
return ""
}
viewP := int(m.viewport.ScrollPercent() * 100)
info := fmt.Sprintf(" %s", percentStyle.Render(fmt.Sprintf("%d%%", viewP)))
totalLength := m.viewport.Width - lipgloss.Width(info)
finishedCount := int((float64(totalLength) / 100) * float64(viewP))
return lipgloss.JoinHorizontal(
lipgloss.Center,
info,
strings.Repeat("/", finishedCount),
strings.Repeat("─", max(0, totalLength-finishedCount)),
)
}
type termPager struct {
initialized bool
model *model
teaPager *tea.Program
buf chan []byte
statusCh chan error
}
func (tp *termPager) init() {
tp.statusCh = make(chan error)
tp.buf = make(chan []byte)
tp.model = &model{renderedOnce: make(chan struct{})}
go func() {
tp.teaPager = tea.NewProgram(
tp.model,
)
go func() {
_, e := tp.teaPager.Run()
tp.statusCh <- e
close(tp.statusCh)
}()
fallback := false
select {
case <-tp.model.renderedOnce:
case err := <-tp.statusCh:
if err != nil {
fallback = true
}
}
for {
select {
case s := <-tp.buf:
if !fallback {
tp.teaPager.Send(string(s))
} else {
os.Stdout.Write(s)
}
case <-tp.statusCh:
return
}
}
}()
tp.initialized = true
}
func (tp *termPager) Write(p []byte) (int, error) {
if !tp.initialized {
tp.init()
}
tp.buf <- p
return len(p), nil
}
func (tp *termPager) WaitForExit() {
if !tp.initialized {
return
}
// Wait until the term pager this is closed
// which is trigerred when there is an error
// or the user quits
for status := range tp.statusCh {
_ = status
}
}
func newTermPager() *termPager {
return &termPager{}
}