/usr/share/acl2-8.0dfsg/books/oslib/catpath.lisp is in acl2-books-source 8.0dfsg-1.
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; Copyright (C) 2013-2014 Centaur Technology
;
; Contact:
; Centaur Technology Formal Verification Group
; 7600-C N. Capital of Texas Highway, Suite 300, Austin, TX 78731, USA.
; http://www.centtech.com/
;
; License: (An MIT/X11-style license)
;
; Permission is hereby granted, free of charge, to any person obtaining a
; copy of this software and associated documentation files (the "Software"),
; to deal in the Software without restriction, including without limitation
; the rights to use, copy, modify, merge, publish, distribute, sublicense,
; and/or sell copies of the Software, and to permit persons to whom the
; Software is furnished to do so, subject to the following conditions:
;
; The above copyright notice and this permission notice shall be included in
; all copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
; DEALINGS IN THE SOFTWARE.
;
; Original authors: Jared Davis <jared@centtech.com>
; Sol Swords <sswords@centtech.com>
(in-package "OSLIB")
(include-book "std/util/define" :dir :system)
(include-book "std/strings/cat" :dir :system)
(local (include-book "misc/assert" :dir :system))
(define catpath ((basedir stringp
"Directory whose name should be extended, which may
or may not end with a slash. Idioms like @('~'),
@('~jared'), and @('..') will be preserved. The
empty string means the current directory.")
(filename stringp
"File or subdirectory name to append to @('basedir')"))
:returns (path "A new string like @('basedir/filename'). We only insert a
slash if @('basedir') does not end with a slash. We don't
normalize the path by collapsing @('..')."
stringp)
:parents (oslib)
:short "Basic concatenation operation for paths."
:long "<p>ACL2 includes a built-in function named @('extend-pathname') that
is similar to @('catpath'). In some ways ACL2's version is nicer than
@('catpath'). It sometimes cleans up the path and gets rid of @('..')
characters. But it also sometimes expands away symlinks, which you may not
want to do. At the time of this writing, @('extend-pathname') is not easy to
effectively bring into logic mode, but that may change in the future.</p>
<p>Our @('catpath') function is comparatively primitive. It doesn't try to
simplify the path in any way.</p>
<p>We assume Unix style paths, i.e., @('/') is the path separator. It's not
clear what we should do to support other systems like Windows.</p>"
(b* ((len (length basedir))
((when (or (int= len 0)
(eql (char basedir (- len 1)) #\/)))
(cat basedir filename)))
(cat basedir "/" filename)))
(local
(progn
;; Basic examples
(assert! (equal (catpath "" "foo.txt") "foo.txt"))
(assert! (equal (catpath "/" "foo.txt") "/foo.txt"))
(assert! (equal (catpath "~/" "foo.txt") "~/foo.txt"))
(assert! (equal (catpath "~/../" "foo.txt") "~/../foo.txt"))
(assert! (equal (catpath "~/../" "../") "~/../../"))
(assert! (equal (catpath "/home/jared" "foo.txt")
"/home/jared/foo.txt"))
(assert! (equal (catpath "/home/jared/" "foo.txt")
"/home/jared/foo.txt"))
))
(define catpaths
:parents (oslib)
:short "Extend a base directory with many file names."
((basedir stringp "Directory whose name should be extended, which may
or may not end with a slash.")
(filenames string-listp "Names of files to append to @('basedir')."))
:returns (paths string-listp "Extended paths.")
(if (atom filenames)
nil
(cons (catpath basedir (car filenames))
(catpaths basedir (cdr filenames)))))
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