[Ecls-list] Conformity and convenience problems with pathnames

[Pascal J. Bourguignon]

Hello,

It is well known that implementations of CL pathnames have been greatly
implementation dependant.  However, the standard still specifies clear
behavior for logical pathnames, for one thing, and for the other, since
there are several implementations working on the same POSIX systems
(unix including linux and MacOSX; and MS-Windows), it is desirable that
all implementations converge in their handling of pathnames on these
plateforms.

Personnaly, I resolved to use logical pathnames and logical-pathname
translations as much as possible, and to use make-pathname to build
portably physical pathnames. 

However, most implementations have problems dealing with these two
aspects.   To improve the situation, I wrote a little script to check
the behavior of implementations in these two aspects.

The script can be found at:

ftp://ftp.informatimago.com/users/pjb/lisp/check-pathnames.lisp

Since I'm sending a similar message to most implementation  lists, it
might be better, if there is any need for 'language lawyer' discussions,
to direct them to news:comp.lang.lisp.


Here are the results for the ecl 10.7.1:
------------------------------------------------------------------------
[pjb at kuiper :0.0 ~]$ ecl -norc
ECL (Embeddable Common-Lisp) 10.7.1
Copyright (C) 1984 Taiichi Yuasa and Masami Hagiya
Copyright (C) 1993 Giuseppe Attardi
Copyright (C) 2000 Juan J. Garcia-Ripoll
ECL is free software, and you are welcome to redistribute it
under certain conditions; see file 'Copyright' for details.
Type :h for Help.  
Top level.
> *features*

(:LINUX :FORMATTER :LONG-LONG :UINT64-T :UINT32-T :UINT16-T
 :RELATIVE-PACKAGE-NAMES :LONG-FLOAT :UNICODE :CLOS-STREAMS :CMU-FORMAT :UNIX
 :ECL-PDE :DLOPEN :CLOS :BOEHM-GC :ANSI-CL :COMMON-LISP :IEEE-FLOATING-POINT
 :PREFIXED-API :FFI :X86_64 :COMMON :ECL)
> (load "/home/pjb/src/lisp/check-pathnames.lisp")

;;; Loading "/home/pjb/src/lisp/check-pathnames.lisp"

================================================================================

Test and probe conforming logical pathnames, and their translation to
unix physical pathnames.

We want to check the good working of logical pathnames, and the
translation of logical pathnames to physical pathnames, in a
semi-standard way on unix systems.

Namely, given the logical host and its translations:

  (setf (logical-pathname-translations "LOGICAL") nil)
  (setf (logical-pathname-translations "LOGICAL") 
        '((#P"LOGICAL:**;*.*" #P"/tmp/**/*.*")
          (#P"LOGICAL:**;*"   #P"/tmp/**/*")))

#P"LOGICAL:DIR;SUBDIR;NAME.TYPE.NEWEST"
must be the same as (make-pathname :host "LOGICAL"
                                   :directory '(:absolute "DIR" "SUBDIR")
                                   :name "NAME" :type "TYPE" :version :newest
                                   :case :common)
and must translate to: #P"/tmp/dir/subdir/name.type" on unix.



Merging physical pathnames specified with :case :common is also tested:

  (merge-pathnames (make-pathname :directory '(:relative "DIR" "SUBDIR")
                                  :name "NAME" :type "TYPE" :version :newest
                                  :case :common :default #1=#P"/tmp/")
                    #1# nil)

must give #P"/tmp/dir/subdir/name.type".

================================================================================
The customary case for the file system of ECL (10.7.1) is upper case.
--------------------------------------------------------------------------------
Failed assertion: (EQL *CUSTOMARY-CASE* :LOWER)
   with: *CUSTOMARY-CASE* = :UPPER
    and: :LOWER = :LOWER
99% of the unix path names are entirely lower case, so the customary case for 
an implementation on unix should be lower case.

================================================================================
(MAKE-PATHNAME :HOST
               "LOGICAL"
               :DEVICE
               :UNSPECIFIC
               :DIRECTORY
               (:ABSOLUTE "DIR" "SUBDIR")
               :NAME
               "NAME"
               :TYPE
               "TYPE"
               :VERSION
               :NEWEST
               :CASE
               :COMMON)


LOGICAL-PATHNAME #P"LOGICAL:DIR;SUBDIR;NAME.TYPE.NEWEST"
--------------------  :case :local (default)
Host      : "LOGICAL"
Device    : :UNSPECIFIC
Directory : (:ABSOLUTE "DIR" "SUBDIR")
Name      : "NAME"
Type      : "TYPE"
Version   : :NEWEST
--------------------  :case :common
Host      : "logical"
Device    : :UNSPECIFIC
Directory : (:ABSOLUTE "dir" "subdir")
Name      : "name"
Type      : "type"
Version   : :NEWEST
--------------------  
--------------------------------------------------------------------------------
Failed assertion: (STRING= (PATHNAME-HOST PATH :CASE :COMMON)
                           (POP EXPECTED-VALUES))
   with: (PATHNAME-HOST PATH :CASE :COMMON) = "logical"
    and: (POP EXPECTED-VALUES) = "LOGICAL"
19.2.2.1.2  makes no exception for pathname-host of logical pathnames.
--------------------------------------------------------------------------------
Failed assertion: (DIRLIST= (PATHNAME-DIRECTORY PATH :CASE :COMMON)
                            (POP EXPECTED-VALUES))
   with: (PATHNAME-DIRECTORY PATH :CASE :COMMON) = (:ABSOLUTE "dir" "subdir")
    and: (POP EXPECTED-VALUES) = (:ABSOLUTE "DIR" "SUBDIR")
--------------------------------------------------------------------------------
Failed assertion: (STRING= (PATHNAME-NAME PATH :CASE :COMMON)
                           (POP EXPECTED-VALUES))
   with: (PATHNAME-NAME PATH :CASE :COMMON) = "name"
    and: (POP EXPECTED-VALUES) = "NAME"
--------------------------------------------------------------------------------
Failed assertion: (STRING= (PATHNAME-TYPE PATH :CASE :COMMON)
                           (POP EXPECTED-VALUES))
   with: (PATHNAME-TYPE PATH :CASE :COMMON) = "type"
    and: (POP EXPECTED-VALUES) = "TYPE"



================================================================================
(MAKE-PATHNAME :HOST
               "LOGICAL"
               :DEVICE
               :UNSPECIFIC
               :DIRECTORY
               (:ABSOLUTE "DIR" "SUBDIR")
               :NAME
               "NAME"
               :TYPE
               "TYPE"
               :VERSION
               :NEWEST
               :CASE
               :LOCAL)


LOGICAL-PATHNAME #P"LOGICAL:DIR;SUBDIR;NAME.TYPE.NEWEST"
--------------------  :case :local (default)
Host      : "LOGICAL"
Device    : :UNSPECIFIC
Directory : (:ABSOLUTE "DIR" "SUBDIR")
Name      : "NAME"
Type      : "TYPE"
Version   : :NEWEST
--------------------  :case :common
Host      : "logical"
Device    : :UNSPECIFIC
Directory : (:ABSOLUTE "dir" "subdir")
Name      : "name"
Type      : "type"
Version   : :NEWEST
--------------------  

#P"/home/pjb/src/lisp/check-pathnames.lisp"
> (quit)
[pjb at kuiper :0.0 ~]$ 

-- 
__Pascal Bourguignon__                     http://www.informatimago.com/
A bad day in () is better than a good day in {}.