feat: add option to delete log files in TUI

Press D to open delete confirmation, Enter to confirm, ESC to cancel.
Deletes (truncates) log files for selected streams only.

Author: nedimf

internal/tui/tui.go

@@ -2,6 +2,8 @@ package tui
 
 import (
 	"fmt"
+	"os"
+	"path/filepath"
 	"regexp"
 	"strings"
 	"time"
@@ -67,6 +69,7 @@ type Model struct {
 	detailMode      bool // showing detail view of selected entry
 	reverseOrder    bool // show newest logs at top instead of bottom
 	showStreamList  bool // show full streams list overlay
+	confirmDelete   bool // showing delete confirmation
 }
 
 func New(manager *logtail.Manager, cfg *config.Config) *Model {
@@ -143,18 +146,30 @@ func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			m.searchMode = true
 
 		case "esc":
-			if m.detailMode {
+			if m.confirmDelete {
+				m.confirmDelete = false
+			} else if m.detailMode {
 				m.detailMode = false
 				m.viewport.SetContent(m.renderTable())
 			} else if m.showStreamList {
 				m.showStreamList = false
 			}
 
 		case "enter":
-			if len(m.filteredBuffer) > 0 && m.selectedIdx < len(m.filteredBuffer) {
+			if m.confirmDelete {
+				m.deleteLogFiles()
+				m.confirmDelete = false
+				m.logBuffer = make([]LogEntry, 0, 1000)
+				m.filteredBuffer = m.logBuffer
+				m.scrollOffset = 0
+				m.viewport.SetContent(m.renderTable())
+			} else if len(m.filteredBuffer) > 0 && m.selectedIdx < len(m.filteredBuffer) {
 				m.detailMode = !m.detailMode
 			}
 
+		case "D":
+			m.confirmDelete = true
+
 		case "up", "k":
 			if m.selectedIdx > 0 {
 				m.selectedIdx--
@@ -262,6 +277,10 @@ func (m *Model) View() string {
 		return "Initializing..."
 	}
 
+	if m.confirmDelete {
+		return m.renderDeleteConfirm()
+	}
+
 	if m.detailMode && len(m.filteredBuffer) > 0 && m.selectedIdx < len(m.filteredBuffer) {
 		return m.renderDetailView()
 	}
@@ -332,6 +351,39 @@ func (m *Model) renderStreamList() string {
 	)
 }
 
+func (m *Model) renderDeleteConfirm() string {
+	title := titleStyle.Render(" DELETE LOGS ")
+	header := headerBg.Width(m.width).Render(title + strings.Repeat(" ", max(0, m.width-lipgloss.Width(title))))
+
+	var content strings.Builder
+	content.WriteString("\n\n")
+	content.WriteString(errorColor.Render("  ⚠ WARNING: This will permanently delete log file contents!\n\n"))
+	content.WriteString(cyanColor.Render("  The following log files will be cleared:\n\n"))
+
+	for _, stream := range m.config.Streams {
+		if m.selectedStreams[stream.Name] {
+			content.WriteString(fmt.Sprintf("    • %s (%s)\n", stream.Name, stream.Path))
+		}
+	}
+
+	content.WriteString("\n")
+	content.WriteString(whiteColor.Render("  Press ENTER to confirm, ESC to cancel\n"))
+
+	confirmBox := lipgloss.NewStyle().
+		Width(m.width - 4).
+		Height(m.height - 6).
+		Render(content.String())
+
+	footer := helpBar.Render(errorColor.Render("[ENTER] Delete  ") + grayColor.Render("[ESC] Cancel"))
+
+	return lipgloss.JoinVertical(
+		lipgloss.Left,
+		header,
+		borderStyle.Render(confirmBox),
+		footer,
+	)
+}
+
 func (m *Model) renderDetailView() string {
 	entry := m.filteredBuffer[m.selectedIdx]
 
@@ -572,7 +624,7 @@ func (m *Model) renderFooter() string {
 	stats := fmt.Sprintf("Lines: %d | Visible: %d/%d | Scroll: %d",
 		len(m.logBuffer), len(m.filteredBuffer), 1000, m.scrollOffset)
 
-	controls := grayColor.Render("[↑/↓]Select [Enter]Detail [/]Search [s]Streams [r]Reverse [c]Clear [p]Pause [q]Quit")
+	controls := grayColor.Render("[↑/↓]Select [Enter]Detail [/]Search [s]Streams [r]Reverse [c]Clear [D]Delete [p]Pause [q]Quit")
 
 	helpBar2 := helpBar.Render(status + controls)
 	return helpBar2 + "\n" + helpBar.Render(stats)
@@ -695,6 +747,29 @@ func (m *Model) tick() tea.Cmd {
 
 type tickMsg time.Time
 
+func (m *Model) deleteLogFiles() {
+	for _, stream := range m.config.Streams {
+		if !m.selectedStreams[stream.Name] {
+			continue
+		}
+
+		// Find log files matching the stream patterns
+		for _, pattern := range stream.Patterns {
+			matches, err := filepath.Glob(filepath.Join(stream.Path, pattern))
+			if err != nil {
+				continue
+			}
+
+			for _, match := range matches {
+				// Truncate the file (clear contents but keep file)
+				if err := os.Truncate(match, 0); err != nil {
+					continue
+				}
+			}
+		}
+	}
+}
+
 func max(a, b int) int {
 	if a > b {
 		return a