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+;; -*- coding: utf-8; -*-
+;; gitto -- Keep track of your git repositories
+;; Copyright (C) 2012 Tom Willemse <tom at ryuslash dot org>
+
+;; This file is part of gitto.
+
+;; gitto 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.
+
+;; gitto 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 gitto.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gitto command)
+  #:export (define-command
+            command?
+            command-documentation
+            command-function
+            for-each-command))
+
+(define-syntax define-command
+  (syntax-rules ()
+    ((_ (name . args)
+        usage
+        longdoc
+        exp exp* ...)
+     (begin
+       (set! command-list
+             (cons
+              (list (symbol->string (quote name))
+                    (cons
+                     #:function
+                     (case-lambda*
+                      (args
+                       exp exp* ...)
+                      (lst (format #t "Wrong number of arguments.~%"))))
+                    (cons #:usage usage)
+                    (cons #:documentation longdoc))
+              command-list))))))
+
+(define command-list '())
+
+(define (command? name)
+  "Check if NAME corresponds to a command."
+  (not (null? (assoc-ref command-list name))))
+
+(define (command-documentation command)
+  "Get the documentation for COMMAND."
+  (assq-ref (assoc-ref command-list command) #:documentation))
+
+(define (command-function command)
+  "Get the function for COMMAND."
+  (assq-ref (assoc-ref command-list command) #:function))
+
+(define (for-each-command function)
+  "Execute FUNCTION for each known command."
+  (for-each function command-list))