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package gui
import (
"fmt"
"log"
"os"
"strings"
"sync"
"time"
"fyne.io/fyne/v2"
"fyne.io/fyne/v2/container"
"fyne.io/fyne/v2/widget"
)
// LogWriter is a custom writer that captures log output
type LogWriter struct {
viewer *LogViewer
original *os.File
}
// Write implements io.Writer
func (w *LogWriter) Write(p []byte) (n int, err error) {
// Write to original output
if w.original != nil {
w.original.Write(p)
}
// Send to log viewer
if w.viewer != nil {
message := strings.TrimRight(string(p), "\n")
if message != "" {
w.viewer.AddMessage(message)
}
}
return len(p), nil
}
// LogViewer is a widget that displays log messages
type LogViewer struct {
widget.BaseWidget
container *fyne.Container
logEntry *widget.Entry
scrollView *container.Scroll
mu sync.Mutex
messages []string
maxMessages int
// For capturing output
originalStdout *os.File
originalStderr *os.File
stdoutWriter *LogWriter
stderrWriter *LogWriter
}
// NewLogViewer creates a new log viewer widget
func NewLogViewer() *LogViewer {
v := &LogViewer{
maxMessages: 1000, // Keep last 1000 messages
messages: make([]string, 0),
}
// Create log entry (read-only multiline)
v.logEntry = widget.NewMultiLineEntry()
v.logEntry.Disable() // Make it read-only
v.logEntry.Wrapping = fyne.TextWrapWord
// Create scroll container
v.scrollView = container.NewScroll(v.logEntry)
v.scrollView.SetMinSize(fyne.NewSize(0, 180)) // Same height as old phonetic display
// Configure scroll behavior
v.scrollView.Direction = container.ScrollBoth
// Create container with label
v.container = container.NewBorder(
widget.NewLabel("Log messages (newest first):"),
nil,
nil,
nil,
v.scrollView,
)
v.ExtendBaseWidget(v)
return v
}
// CreateRenderer implements fyne.Widget
func (v *LogViewer) CreateRenderer() fyne.WidgetRenderer {
return widget.NewSimpleRenderer(v.container)
}
// StartCapture starts capturing stdout and stderr
func (v *LogViewer) StartCapture() {
// Save original outputs
v.originalStdout = os.Stdout
v.originalStderr = os.Stderr
// Create custom writers
v.stdoutWriter = &LogWriter{viewer: v, original: v.originalStdout}
v.stderrWriter = &LogWriter{viewer: v, original: v.originalStderr}
// Create pipe for stdout
stdoutR, stdoutW, _ := os.Pipe()
os.Stdout = stdoutW
// Create pipe for stderr
stderrR, stderrW, _ := os.Pipe()
os.Stderr = stderrW
// Also redirect log package output
log.SetOutput(v.stdoutWriter)
// Start goroutines to read from pipes
go v.pipeReader(stdoutR, v.stdoutWriter)
go v.pipeReader(stderrR, v.stderrWriter)
}
// pipeReader reads from a pipe and writes to a LogWriter
func (v *LogViewer) pipeReader(pipe *os.File, writer *LogWriter) {
buf := make([]byte, 1024)
for {
n, err := pipe.Read(buf)
if n > 0 {
writer.Write(buf[:n])
}
if err != nil {
break
}
}
}
// StopCapture stops capturing stdout and stderr
func (v *LogViewer) StopCapture() {
if v.originalStdout != nil {
os.Stdout = v.originalStdout
v.originalStdout = nil
}
if v.originalStderr != nil {
os.Stderr = v.originalStderr
v.originalStderr = nil
}
// Reset log package output
log.SetOutput(os.Stderr)
}
// AddMessage adds a message to the log
func (v *LogViewer) AddMessage(message string) {
v.mu.Lock()
defer v.mu.Unlock()
// Add timestamp
timestamp := time.Now().Format("15:04:05")
fullMessage := fmt.Sprintf("[%s] %s", timestamp, message)
// Prepend to messages (newest first)
v.messages = append([]string{fullMessage}, v.messages...)
// Trim if too many messages (remove oldest from the end)
if len(v.messages) > v.maxMessages {
v.messages = v.messages[:v.maxMessages]
}
// Update UI on main thread
fyne.Do(func() {
// Set the full text with newest messages at top
text := strings.Join(v.messages, "\n")
v.logEntry.SetText(text)
// Keep scroll at top to show newest messages
v.scrollView.Offset = fyne.NewPos(0, 0)
v.scrollView.Refresh()
})
}
// Clear clears all log messages
func (v *LogViewer) Clear() {
v.mu.Lock()
defer v.mu.Unlock()
v.messages = v.messages[:0]
fyne.Do(func() {
v.logEntry.SetText("")
v.scrollView.Offset = fyne.NewPos(0, 0)
v.scrollView.Refresh()
})
}
// Log adds a message without timestamp (for internal use)
func (v *LogViewer) Log(format string, args ...interface{}) {
message := fmt.Sprintf(format, args...)
v.AddMessage(message)
}
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