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;;; logito.el --- logging library for Emacs
;; Copyright (C) 2012 Yann Hodique
;; Author: Yann Hodique <>
;; Keywords: lisp, tool
;; Version: 0.1
;; Package-Requires: ((eieio "1.3"))
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; This module provides logging facility for Emacs
;;; Code:
(require 'cl))
(require 'eieio)
(defclass logito-object ()
((level :initarg :level :initform nil)))
(defmethod logito-insert-log ((log logito-object) format &rest objects)
"Base implementation, do nothing")
(defmethod logito-should-log ((log logito-object) level)
(let ((l (oref log :level)))
(and (integerp l)
(<= level l))))
(defmethod logito-log ((log logito-object) level tag string &rest objects)
(when (logito-should-log log level)
(apply 'logito-insert-log log (format "[%s] %s" tag string) objects)))
(defmethod logito-log (log level tag string &rest objects)
"Fallback implementation, do nothing. This allows in particular
to pass nil as the log object."
(defclass logito-message-object (logito-object)
(defmethod logito-insert-log ((log logito-message-object) format &rest objects)
(apply 'message format objects))
(defclass logito-buffer-object (logito-object)
((buffer :initarg :buffer :initform nil)))
(defmethod logito-should-log ((log logito-buffer-object) level)
(and (oref log :buffer)
(defmethod logito-insert-log ((log logito-buffer-object) format &rest objects)
(let ((buffer (get-buffer-create (oref log :buffer))))
(with-current-buffer buffer
(goto-char (point-max))
(insert (apply 'format format objects) "\n\n"))))
(defmacro logito-def-level (sym val &optional pkg)
"Define a constant logito-<SYM>-level and a macro logito:<SYM>
associated with this level."
(let* ((pkg (or pkg 'logito))
(const (intern (format "%s:%s-level"
(symbol-name pkg) (symbol-name sym))))
(mac (intern (format "%s:%s"
(symbol-name pkg) (symbol-name sym)))))
(defconst ,const ,val)
(defmacro ,mac (log string &rest objects)
(list 'logito-log log ,const '',sym string)
;; built-in log levels
(logito-def-level error 0)
(logito-def-level info 5)
(logito-def-level verbose 10)
(logito-def-level debug 15)
(provide 'logito)
;;; logito.el ends here