;;; Lisplab, extra.lisp
;;; Some string and file utilities

;;; Copyright (C) 2009 Joern Inge Vestgaarden
;;;
;;; 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 2 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, write to the Free Software Foundation, Inc.,
;;; 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

(in-package :lisplab)

(defun strcat (&rest args)
  "Concatenates the strings." 
  (apply #'concatenate (append (list 'string) args)))

(defmacro in-dir (dir &body body)
  "Temperarily binds *default-pathname-defaults* to dir. When directory
does not exists, it is created."
  (let ((path (gensym))
        (dir2 (gensym)))
    `(let* ((,dir2 ,dir)
            (,path (merge-pathnames (if (pathnamep ,dir2) 
					,dir2 
					(pathname (strcat ,dir2 "/")))
				    *default-pathname-defaults*)))
       (ensure-directories-exist ,path)
       (unless (probe-file ,path)
	 (error "<~S> is no directory" ,path ))
       (let ((*default-pathname-defaults* ,path))
	 ,@body))))