in-directory: add optional argument to filter directories

pkgs/base/info.rkt

@@ -6,16 +6,19 @@
 ;; moved out of the core, while a new "base2" package can represent
 ;; the new, smaller core.
 
-;; The "base" package also depends on "raclet-lib", which ensures that
+;; The "base" package also depends on "racket-lib", which ensures that
 ;; any native libraries needed for a platform are installed along with
 ;; practically any package installation.
 
 (define collection 'multi)
 
-(define deps '("racket-lib"))
+(define deps '("racket-lib"
+               ["racket" #:version "6.0.0.1"]))
 
 (define implies '(core))
 
 (define pkg-desc "Racket libraries that are currently always available")
 
 (define pkg-authors '(mflatt))
+
+(define version "6.0.0.1")

pkgs/racket-pkgs/racket-doc/scribblings/reference/sequences.scrbl

@@ -361,18 +361,26 @@ each element in the sequence.
       (printf "key and value: ~a\n" key+value))]
 }
 
-@defproc[(in-directory [dir (or/c #f path-string?) #f]) sequence?]{
+@defproc[(in-directory [dir (or/c #f path-string?) #f]
+                       [use-dir? ((and/c path? complete-path?) . -> . any/c)
+                                 (lambda (dir-path) #t)])
+         sequence?]{
   Returns a sequence that produces all of the paths for files,
-  directories, and links within @racket[dir].  If @racket[dir] is not
+  directories, and links within @racket[dir], except for the
+  contents of any directory for which @racket[use-dir?] returns
+  @racket[#f]. If @racket[dir] is not
   @racket[#f], then every produced path starts with @racket[dir] as
   its prefix.  If @racket[dir] is @racket[#f], then paths in and
   relative to the current directory are produced.
 
   An @racket[in-directory] sequence traverses nested subdirectories
-  recursively. To generate a sequence that includes only the immediate
+  recursively (filtered by @racket[use-dir?]).
+  To generate a sequence that includes only the immediate
   content of a directory, use the result of @racket[directory-list] as
   a sequence.
-}
+
+@history[#:changed "6.0.0.1" @elem{Added @racket[use-dir?] argument.}]}
+
 
 @defproc*[([(in-producer [producer procedure?])
             sequence?]

racket/collects/racket/HISTORY.txt

@@ -1,3 +1,6 @@
+Version 6.0.0.1
+Moved detailed-change recording to documentation
+
 Version 6.0, January 2014
 Packages & collections: ----------
  Reorganized collections into packages

racket/collects/racket/private/for.rkt

@@ -1946,9 +1946,10 @@
     (for/fold ([acc acc]) ([f (in-list (directory-list full-d))])
 	      (cons (build-path d f) acc)))
 
-  (define (next-body l d init-dir)
+  (define (next-body l d init-dir use-dir?)
     (let ([full-d (path->complete-path d init-dir)])
-      (if (directory-exists? full-d)
+      (if (and (directory-exists? full-d)
+               (use-dir? full-d))
 	  (dir-list full-d d (cdr l))
 	  (cdr l))))
 
@@ -1960,15 +1961,16 @@
 
   (define *in-directory
     (case-lambda 
-     [() (*in-directory #f)]
-     [(orig-dir)
+     [() (*in-directory #f (lambda (d) #t))]
+     [(orig-dir) (*in-directory #f (lambda (d) #t))]
+     [(orig-dir use-dir?)
       (define init-dir (current-directory))
       ;; current state of the sequence is a list of paths to produce; when
       ;; incrementing past a directory, add the directory's immediate
       ;; content to the front of the list:
       (define (next l)
 	(define d (car l))
-	(next-body l d init-dir))
+	(next-body l d init-dir use-dir?))
       (make-do-sequence
        (lambda ()
 	 (values
@@ -1984,16 +1986,19 @@
     (λ (stx)
        (syntax-case stx ()
 	 [((d) (_)) #'[(d) (*in-directory #f)]]
-	 [((d) (_ dir))
+	 [((d) (_ dir)) #'[(d) (*in-directory dir (lambda (d) #t))]]
+	 [((d) (_ dir use-dir?-expr))
 	  #'[(d) 
 	     (:do-in
-	      ([(orig-dir) (or dir #f)] [(init-dir) (current-directory)])
+	      ([(orig-dir) (or dir #f)]
+               [(init-dir) (current-directory)]
+               [(use-dir?) use-dir?-expr])
 	      #true
 	      ([l (initial-state orig-dir init-dir)])
 	      (pair? l)
 	      ([(d) (car l)])
 	      #true
 	      #true
-	      [(next-body l d init-dir)])]])))
+	      [(next-body l d init-dir use-dir?)])]])))
 
   )