Add ability to log directly to a file

logging.go

@@ -5,13 +5,35 @@ package boba
 import (
 	"log"
 	"log/syslog"
+	"os"
 )
 
+// LogToFile sets up default logging to log to a file This is helpful as we
+// can't print to the terminal since our TUI is occupying it. If the file
+// doesn't exist it will be created.
+//
+// Don't forget to close the file when you're done with it.
+//
+//   f, err := LogToFile("debug.log", "debug")
+//   if err != nil {
+//		fmt.Println("fatal:", err)
+//		os.Exit(1)
+//   }
+//   defer f.Close()
+func LogToFile(path string, prefix string) (*os.File, error) {
+	f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
+	if err != nil {
+		return nil, err
+	}
+	log.SetOutput(f)
+	return f, nil
+}
+
 // UseSysLog sets up logging to log the system log. This becomes helpful when
-// debugging since we can't easily print to the terminal since our TUI is
-// occupying it!
+// debugging since we can't print to the terminal since our TUI is occupying it.
 //
 // On macOS this is a just a matter of: tail -f /var/log/system.log
+// On Linux this varies depending on distribution.
 func UseSysLog(programName string) error {
 	l, err := syslog.New(syslog.LOG_NOTICE, programName)
 	if err != nil {