Merge remote branch 'origin'

collects/2htdp/batch-io.rkt

@@ -77,7 +77,7 @@
   (define lines (read-chunks f read-line (lambda (x) x)))
   (foldl (lambda (f r)
            (define fst (filter (compose not (curry string=? "")) (split f)))
-           (if (empty? fst) r (combine fst r)))
+           (combine fst r))
          '() lines))
 
 (def-reader (read-csv-file f)
@@ -93,10 +93,9 @@
 (define-syntax (simulate-file stx)
   (syntax-case stx ()
     [(simulate-file) 
-     (raise-syntax-error #f "expects a reader function as first argument" stx)]
+     (raise-syntax-error #f "expects at least one sub-expression" stx)]
     [(simulate-file reader str ...) #'(simulate-file/proc (f2h reader) str ...)]))
      
-
 (define (simulate-file/proc reader . los)
   (define _1 (check-proc "simulate-file" reader 1 "reader" "one argument"))
   (define _2 

collects/scribblings/reference/filesystem.scrbl

@@ -111,7 +111,7 @@ by @racket[kind], which must be one of the following:
 
  @item{@indexed-racket['exec-file] --- the path of the Racket
  executable as provided by the operating system for the current
- invocation.
+ invocation. For some operating systems, the path can be relative.
 
  @margin-note{For GRacket, the executable path is the name of a GRacket
  executable.}}

collects/teachpack/2htdp/scribblings/batch-io.scrbl

@@ -93,6 +93,7 @@ a part of the separator that surrounds the word @scheme["good"].
 ]
 The results is similar to the one that @scheme[read-words] produces,
 except that the organization of the file into lines is preserved. 
+In particular, the empty third line is represented as an empty list of words. 
 }
 
 @item{@reading[read-csv-file (listof (listof any/c))]{a list of lists of comma-separated values}

collects/teachpack/2htdp/scribblings/data.txt

@@ -1,3 +1,4 @@
 hello world 
  good bye 
+
 i am done