Add state tracking and pacman package enhancements

pkg/state/state.go

@@ -0,0 +1,43 @@
+package state
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+var logFile *os.File
+
+func OpenLog() error {
+	logPath := filepath.Join("/var/log", "declpac.log")
+	f, err := os.OpenFile(logPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		return err
+	}
+	logFile = f
+	return nil
+}
+
+func GetLogWriter() io.Writer {
+	return logFile
+}
+
+func Write(msg []byte) {
+	PrependWithTimestamp(logFile, msg)
+}
+
+func Close() error {
+	if logFile == nil {
+		return nil
+	}
+	return logFile.Close()
+}
+
+func PrependWithTimestamp(w io.Writer, msg []byte) {
+	ts := time.Now().Format("2006-01-02 15:04:05")
+	header := fmt.Sprintf("\n--- %s ---\n", ts)
+	w.Write([]byte(header))
+	w.Write(msg)
+}