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;;; Copyright © 2019 - 2022 Jakob L. Kreuze <zerodaysfordays@sdf.org>
;;;
;;; This program 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 3 of the
;;; License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (dynamic logging)
#:use-module (ice-9 format)
#:use-module (srfi srfi-19)
#:export (log-append!))
(define %log-file-name (make-parameter "/var/log/jakob-dynamic.log"))
(define %log-level (make-parameter 'info))
(define (dominates message-level baseline-level)
"Determine if `a' should be shown for baseline log level `b'."
(define log-level-hierarchy '(debug info warn error))
(>= (list-index log-level-hierarchy message-level)
(list-index log-level-hierarchy baseline-level)))
(define (log-append! level message)
"Append `message', at `level', to the log buffer."
(when (dominates level (%log-level))
(call-with-output-file (%log-file-name)
(lambda (port)
(let ((now (date->string (current-date) "~4")))
(format port "[~a] ~a: ~a~%" now level message))))))
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