misc/fuel/fuel-log.el

   1 ;;; fuel-log.el -- logging utilities
   2
   3 ;; Copyright (C) 2008 Jose Antonio Ortega Ruiz
   4 ;; See http://factorcode.org/license.txt for BSD license.
   5
   6 ;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
   7 ;; Keywords: languages, fuel, factor
   8 ;; Start date: Sun Dec 14, 2008 01:00
   9
  10 ;;; Comentary:
  11
  12 ;; Some utilities for maintaining a simple log buffer, mainly for
  13 ;; debugging purposes.
  14
  15 ;;; Code:
  16
  17 (require 'fuel-base)
  18
  19 \f
  20 ;;; Customization:
  21
  22 (defvar fuel-log--buffer-name "*fuel messages*"
  23   "Name of the log buffer")
  24
  25 (defvar fuel-log--max-buffer-size 32000
  26   "Maximum size of the Factor messages log")
  27
  28 (defvar fuel-log--max-message-size 512
  29   "Maximum size of individual log messages")
  30
  31 (defvar fuel-log--verbose-p t
  32   "Log level for Factor messages")
  33
  34 (defvar fuel-log--inhibit-p nil
  35   "Set this to t to inhibit all log messages")
  36
  37 (define-derived-mode factor-messages-mode fundamental-mode "FUEL Messages"
  38   "Simple mode to log interactions with the factor listener"
  39   (kill-all-local-variables)
  40   (buffer-disable-undo)
  41   (set (make-local-variable 'comint-redirect-subvert-readonly) t)
  42   (add-hook 'after-change-functions
  43             '(lambda (b e len)
  44                (let ((inhibit-read-only t))
  45                  (when (> b fuel-log--max-buffer-size)
  46                    (delete-region (point-min) b))))
  47             nil t)
  48   (setq buffer-read-only t))
  49
  50 (defun fuel-log--buffer ()
  51   (or (get-buffer fuel-log--buffer-name)
  52       (save-current-buffer
  53         (set-buffer (get-buffer-create fuel-log--buffer-name))
  54         (factor-messages-mode)
  55         (current-buffer))))
  56
  57 (defun fuel-log--msg (type &rest args)
  58   (unless fuel-log--inhibit-p
  59     (with-current-buffer (fuel-log--buffer)
  60       (let ((inhibit-read-only t))
  61         (insert
  62          (fuel--shorten-str (format "\n%s: %s\n" type (apply 'format args))
  63                             fuel-log--max-message-size))))))
  64
  65 (defsubst fuel-log--warn (&rest args)
  66   (apply 'fuel-log--msg 'WARNING args))
  67
  68 (defsubst fuel-log--error (&rest args)
  69   (apply 'fuel-log--msg 'ERROR args))
  70
  71 (defsubst fuel-log--info (&rest args)
  72   (when fuel-log--verbose-p
  73     (apply 'fuel-log--msg 'INFO args) ""))
  74
  75 \f
  76 (provide 'fuel-log)
  77 ;;; fuel-log.el ends here