taglib/logging.lisp

;;; -*- Mode: Lisp;  show-trailing-whitespace: t; Base: 10; indent-tabs: nil; Syntax: ANSI-Common-Lisp; Package: LOGGING; -*-
;;; Copyright (c) 2013, Mark VandenBrink. All rights reserved.

(in-package #:logging)

(defmacro start-logging ((name spec) &body body)
  `(unwind-protect
        (progn
          (log5:start-sender 'trace-log
              (log5:stream-sender :location ,name)
              :category-spec ,spec
              :output-spec '(log5:message log5:context))
          ,@body)
     (log5:stop-sender 'trace-log)))

(defparameter *logging-categories* '(mp4-atom::cat-log-mp4-atom
                                     audio-streams::cat-log-stream
                                     mpeg::cat-log-mpeg-frame
                                     flac-frame::cat-log-flac-frame
                                     id3-frame::cat-log-id3-frame))

(defmacro with-logging ((&optional file &key (categories *logging-categories*)) &body body)
  (with-gensyms (output-stream)
    `(let (,output-stream)
       (unwind-protect
            (setf ,output-stream (if ,file
                                     (open ,file :direction :output :if-exists :supersede :if-does-not-exist :create)
                                     *standard-output*))
            (log5:start-sender 'trace-log (log5:stream-sender :location ,output-stream)
                               :category-spec ',categories
                               :output-spec '(log5:message log5:context))
            ,@body)
       (if ,file (close ,output-stream))
       (log5:stop-sender 'trace-log))))