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+;; geiser-log.el -- logging utilities
+
+;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
+
+;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
+;; Start date: Sat Feb 07, 2009 12:07
+
+;; 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 3 of the License, 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
+;; 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/>.
+
+;;; Comentary:
+
+;; Some utilities for maintaining a simple log buffer, mainly for
+;; debugging purposes.
+
+;;; Code:
+
+(require 'geiser-popup)
+(require 'geiser-base)
+
+
+;;; Customization:
+
+(defvar geiser-log--buffer-name "*geiser messages*"
+  "Name of the Geiser log buffer.")
+
+(defvar geiser-log--max-buffer-size 32000
+  "Maximum size of the Geiser messages log.")
+
+(defvar geiser-log--max-message-size 512
+  "Maximum size of individual Geiser log messages.")
+
+(defvar geiser-log--verbose-p t
+  "Log level for Geiser messages")
+
+(defvar geiser-log--inhibit-p nil
+  "Set this to t to inhibit all log messages")
+
+
+;;; Log buffer and mode:
+
+(define-derived-mode geiser-messages-mode fundamental-mode "Geiser Messages"
+  "Simple mode for Geiser log messages buffer."
+  (kill-all-local-variables)
+  (buffer-disable-undo)
+  (set (make-local-variable 'comint-redirect-subvert-readonly) t)
+  (add-hook 'after-change-functions
+            '(lambda (b e len)
+               (let ((inhibit-read-only t))
+                 (when (> b geiser-log--max-buffer-size)
+                   (delete-region (point-min) b))))
+            nil t)
+  (setq buffer-read-only t))
+
+(geiser-popup--define log geiser-log--buffer-name geiser-messages-mode)
+
+
+;;; Logging functions:
+
+(defun geiser-log--msg (type &rest args)
+  (unless geiser-log--inhibit-p
+    (geiser-log--with-buffer
+      (insert (geiser--shorten-str (format "\n%s: %s\n" type (apply 'format args))
+                                   geiser-log--max-message-size)))))
+
+(defsubst geiser-log--warn (&rest args)
+  (apply 'geiser-log--msg 'WARNING args))
+
+(defsubst geiser-log--error (&rest args)
+  (apply 'geiser-log--msg 'ERROR args))
+
+(defsubst geiser-log--info (&rest args)
+  (when geiser-log--verbose-p
+    (apply 'geiser-log--msg 'INFO args) ""))
+
+
+;;; User commands:
+
+(defun geiser-show-logs ()
+  "Show Geiser log messages."
+  (interactive)
+  (geiser-log--pop-to-buffer))
+
+
+(provide 'geiser-log)
+;;; geiser-log.el ends here