Import Upstream version 3a1upstream/3a1

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+;;; "dirs.scm" Directories.
+; Copyright 1998, 2002 Aubrey Jaffer
+;
+;Permission to copy this software, to modify it, to redistribute it,
+;to distribute modified versions, and to use it for any purpose is
+;granted, subject to the following restrictions and understandings.
+;
+;1.  Any copy made of this software must include this copyright notice
+;in full.
+;
+;2.  I have made no warranty or representation that the operation of
+;this software will be error-free, and I am under no obligation to
+;provide any services, by way of maintenance, update, or otherwise.
+;
+;3.  In conjunction with products arising from the use of this
+;material, there shall be no use of my name in any advertising,
+;promotional, or sales literature without prior written consent in
+;each case.
+
+(require 'filename)
+(require 'line-i/o)
+(require 'system)
+(require 'glob)
+
+;;@code{(require 'directory)}
+;;@ftindex directory
+
+;;@args
+;;@0 returns a string containing the absolute file
+;;name representing the current working directory.  If this string
+;;cannot be obtained, #f is returned.
+;;
+;;If @0 cannot be supported by the platform, then #f is returned.
+(define current-directory
+  (case (software-type)
+    ;;((AMIGA)				)
+    ;;((MACOS THINKC)			)
+    ((MS-DOS WINDOWS ATARIST OS/2) (lambda () (system->line "cd")))
+    ;;((NOSVE)				)
+    ((UNIX COHERENT PLAN9) (lambda () (system->line "pwd")))
+    ;;((VMS)				)
+    (else #f)))
+
+;;@body
+;;Creates a sub-directory @1 of the current-directory.  If
+;;successful, @0 returns #t; otherwise #f.
+(define (make-directory name)
+  (eqv? 0 (system (string-append "mkdir \"" name "\""))))
+
+(define (dir:lister dirname tmp)
+  (case (software-type)
+    ((UNIX COHERENT PLAN9)
+     (zero? (system (string-append "ls '" dirname "' > " tmp))))
+    ((MS-DOS WINDOWS OS/2 ATARIST)
+     (zero? (system (string-append "DIR /B \"" dirname "\" > " tmp))))
+    (else (slib:error (software-type) 'list?))))
+
+;;@args proc directory
+;;@var{proc} must be a procedure taking one argument.
+;;@samp{Directory-For-Each} applies @var{proc} to the (string) name of
+;;each file in @var{directory}.  The dynamic order in which @var{proc} is
+;;applied to the filenames is unspecified.  The value returned by
+;;@samp{directory-for-each} is unspecified.
+;;
+;;@args proc directory pred
+;;Applies @var{proc} only to those filenames for which the procedure
+;;@var{pred} returns a non-false value.
+;;
+;;@args proc directory match
+;;Applies @var{proc} only to those filenames for which
+;;@code{(filename:match?? @var{match})} would return a non-false value
+;;(@pxref{Filenames, , , slib, SLIB}).
+;;
+;;@example
+;;(require 'directory)
+;;(directory-for-each print "." "[A-Z]*.scm")
+;;@print{}
+;;"Bev2slib.scm"
+;;"Template.scm"
+;;@end example
+(define (directory-for-each proc dirname . args)
+  (define selector
+    (cond ((null? args) identity)
+	  ((> (length args) 1)
+	   (slib:error 'directory-for-each 'too-many-arguments (cdr args)))
+	  ((procedure? (car args)) (car args))
+	  ((string? (car args)) (filename:match?? (car args)))
+	  (else
+	   (slib:error 'directory-for-each 'filter? (car args)))))
+  (call-with-tmpnam
+   (lambda (tmp)
+     (and (dir:lister dirname tmp)
+	  (file-exists? tmp)
+	  (call-with-input-file tmp
+	    (lambda (port)
+	      (do ((filename (read-line port) (read-line port)))
+		  ((or (eof-object? filename) (equal? "" filename)))
+		(and (selector filename) (proc filename)))))))))