File: pathnames.lisp

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;;; -*- Mode: Lisp -*-

;;; This code is taken from CL-FAD. Original copyright notice follows:

;;; $Header: /usr/local/cvsrep/cl-fad/fad.lisp,v 1.35 2009/09/30 14:23:10 edi Exp $

;;; Copyright (c) 2004, Peter Seibel.  All rights reserved.
;;; Copyright (c) 2004-2009, Dr. Edmund Weitz.  All rights reserved.

;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:

;;;   * Redistributions of source code must retain the above copyright
;;;     notice, this list of conditions and the following disclaimer.

;;;   * Redistributions in binary form must reproduce the above
;;;     copyright notice, this list of conditions and the following
;;;     disclaimer in the documentation and/or other materials
;;;     provided with the distribution.

;;; THIS SOFTWARE IS PROVIDED BY THE AUTHORS 'AS IS' AND ANY EXPRESSED
;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

(in-package :stumpwm)

(export '(list-directory))

(defun component-present-p (value)
  "Helper function for DIRECTORY-PATHNAME-P which checks whether VALUE
is neither NIL nor the keyword :UNSPECIFIC."
  (and value (not (eql value :unspecific))))

(defun directory-pathname-p (pathspec)
  "Returns NIL if PATHSPEC \(a pathname designator) does not designate
a directory, PATHSPEC otherwise.  It is irrelevant whether file or
directory designated by PATHSPEC does actually exist."
  (and 
    (not (component-present-p (pathname-name pathspec)))
    (not (component-present-p (pathname-type pathspec)))
    pathspec))

(defun pathname-as-directory (pathspec)
  "Converts the non-wild pathname designator PATHSPEC to directory
form."
  (let ((pathname (pathname pathspec)))
    (when (wild-pathname-p pathname)
      (error "Can't reliably convert wild pathnames."))
    (cond ((not (directory-pathname-p pathspec))
           (make-pathname :directory (append (or (pathname-directory pathname)
                                                 (list :relative))
                                             (list (file-namestring pathname)))
                          :name nil
                          :type nil
                          :defaults pathname))
          (t pathname))))

(defun directory-wildcard (dirname)
  "Returns a wild pathname designator that designates all files within
the directory named by the non-wild pathname designator DIRNAME."
  (when (wild-pathname-p dirname)
    (error "Can only make wildcard directories from non-wildcard directories."))
  (make-pathname :name #-:cormanlisp :wild #+:cormanlisp "*"
                 :type #-(or :clisp :cormanlisp) :wild
                       #+:clisp nil
                       #+:cormanlisp "*"
                 :defaults (pathname-as-directory dirname)))
#+:clisp
(defun clisp-subdirectories-wildcard (wildcard)
  "Creates a wild pathname specifically for CLISP such that
sub-directories are returned by DIRECTORY."
  (make-pathname :directory (append (pathname-directory wildcard)
                                    (list :wild))
                 :name nil
                 :type nil
                 :defaults wildcard))

(defun list-directory (dirname)
  "Returns a fresh list of pathnames corresponding to the truenames of
all files within the directory named by the non-wild pathname
designator DIRNAME.  The pathnames of sub-directories are returned in
directory form - see PATHNAME-AS-DIRECTORY."
  (when (wild-pathname-p dirname)
    (error "Can only list concrete directory names."))
  #+:ecl 
  (let ((dir (pathname-as-directory dirname)))
    (concatenate 'list
                 (directory (merge-pathnames (pathname "*/") dir))
                 (directory (merge-pathnames (pathname "*.*") dir))))
  #-:ecl 
  (let ((wildcard (directory-wildcard dirname)))
    #+:abcl (system::list-directory dirname)
    #+(or :sbcl :cmu :scl :lispworks) (directory wildcard)
    #+(or :openmcl :digitool) (directory wildcard :directories t)
    #+:allegro (directory wildcard :directories-are-files nil)
    #+:clisp (nconc (directory wildcard :if-does-not-exist :keep)
                    (directory (clisp-subdirectories-wildcard wildcard)))
    #+:cormanlisp (nconc (directory wildcard)
                         (cl::directory-subdirs dirname)))
  #-(or :sbcl :cmu :scl :lispworks :openmcl :allegro :clisp :cormanlisp :ecl :abcl :digitool)
  (error "LIST-DIRECTORY not implemented"))

;;; EOF