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// Package pager provides a pager (similar to less) for the terminal.
//
// $ cat file.txt | gum pager
package pager
import (
"fmt"
"strings"
"time"
"github.com/charmbracelet/gum/timeout"
"github.com/charmbracelet/bubbles/viewport"
tea "github.com/charmbracelet/bubbletea"
"github.com/charmbracelet/lipgloss"
"github.com/muesli/reflow/truncate"
)
type model struct {
content string
origContent string
viewport viewport.Model
helpStyle lipgloss.Style
showLineNumbers bool
lineNumberStyle lipgloss.Style
softWrap bool
search search
matchStyle lipgloss.Style
matchHighlightStyle lipgloss.Style
maxWidth int
timeout time.Duration
hasTimeout bool
}
func (m model) Init() tea.Cmd {
return timeout.Init(m.timeout, nil)
}
func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
switch msg := msg.(type) {
case timeout.TickTimeoutMsg:
if msg.TimeoutValue <= 0 {
return m, tea.Quit
}
m.timeout = msg.TimeoutValue
return m, timeout.Tick(msg.TimeoutValue, msg.Data)
case tea.WindowSizeMsg:
m.ProcessText(msg)
case tea.KeyMsg:
return m.KeyHandler(msg)
}
return m, nil
}
func (m *model) ProcessText(msg tea.WindowSizeMsg) {
m.viewport.Height = msg.Height - lipgloss.Height(m.helpStyle.Render("?")) - 1
m.viewport.Width = msg.Width
textStyle := lipgloss.NewStyle().Width(m.viewport.Width)
var text strings.Builder
// Determine max width of a line.
m.maxWidth = m.viewport.Width
if m.softWrap {
vpStyle := m.viewport.Style
m.maxWidth -= vpStyle.GetHorizontalBorderSize() + vpStyle.GetHorizontalMargins() + vpStyle.GetHorizontalPadding()
if m.showLineNumbers {
m.maxWidth -= lipgloss.Width(" │ ")
}
}
for i, line := range strings.Split(m.content, "\n") {
line = strings.ReplaceAll(line, "\t", " ")
if m.showLineNumbers {
text.WriteString(m.lineNumberStyle.Render(fmt.Sprintf("%4d │ ", i+1)))
}
for m.softWrap && lipgloss.Width(line) > m.maxWidth {
truncatedLine := truncate.String(line, uint(m.maxWidth))
text.WriteString(textStyle.Render(truncatedLine))
text.WriteString("\n")
if m.showLineNumbers {
text.WriteString(m.lineNumberStyle.Render(" │ "))
}
line = strings.Replace(line, truncatedLine, "", 1)
}
text.WriteString(textStyle.Render(truncate.String(line, uint(m.maxWidth))))
text.WriteString("\n")
}
diffHeight := m.viewport.Height - lipgloss.Height(text.String())
if diffHeight > 0 && m.showLineNumbers {
remainingLines := " ~ │ " + strings.Repeat("\n ~ │ ", diffHeight-1)
text.WriteString(m.lineNumberStyle.Render(remainingLines))
}
m.viewport.SetContent(text.String())
}
const heightOffset = 2
func (m model) KeyHandler(key tea.KeyMsg) (model, func() tea.Msg) {
var cmd tea.Cmd
if m.search.active {
switch key.String() {
case "enter":
if m.search.input.Value() != "" {
m.content = m.origContent
m.search.Execute(&m)
// Trigger a view update to highlight the found matches.
m.search.NextMatch(&m)
m.ProcessText(tea.WindowSizeMsg{Height: m.viewport.Height + heightOffset, Width: m.viewport.Width})
} else {
m.search.Done()
}
case "ctrl+d", "ctrl+c", "esc":
m.search.Done()
default:
m.search.input, cmd = m.search.input.Update(key)
}
} else {
switch key.String() {
case "g":
m.viewport.GotoTop()
case "G":
m.viewport.GotoBottom()
case "/":
m.search.Begin()
case "p", "N":
m.search.PrevMatch(&m)
m.ProcessText(tea.WindowSizeMsg{Height: m.viewport.Height + heightOffset, Width: m.viewport.Width})
case "n":
m.search.NextMatch(&m)
m.ProcessText(tea.WindowSizeMsg{Height: m.viewport.Height + heightOffset, Width: m.viewport.Width})
case "q", "ctrl+c", "esc":
return m, tea.Quit
}
m.viewport, cmd = m.viewport.Update(key)
}
return m, cmd
}
func (m model) View() string {
var timeoutStr string
if m.hasTimeout {
timeoutStr = timeout.Str(m.timeout) + " "
}
helpMsg := "\n" + timeoutStr + " ↑/↓: Navigate • q: Quit • /: Search "
if m.search.query != nil {
helpMsg += "• n: Next Match "
helpMsg += "• N: Prev Match "
}
if m.search.active {
return m.viewport.View() + "\n" + timeoutStr + " " + m.search.input.View()
}
return m.viewport.View() + m.helpStyle.Render(helpMsg)
}
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