we need batch io for htdp/2e

svn: r14504

collects/teachpack/2htdp/scribblings/2htdp.scrbl

@@ -7,4 +7,5 @@
 
 @local-table-of-contents[]
 
+@include-section["batch-io.scrbl"]
 @include-section["universe.scrbl"]

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

@@ -0,0 +1,29 @@
+#lang scribble/doc
+
+@(require scribble/manual "shared.ss" 
+          (for-label scheme teachpack/2htdp/batch-io))
+@(require scribble/struct)
+
+@; -----------------------------------------------------------------------------
+
+@teachpack["batch-io"]{Batch Input/Output}
+
+@author{Matthias Felleisen}
+
+@defmodule[#:require-form beginner-require 2htdp/batch-io]
+
+The batch-io teachpack introduces two functions: @scheme[read-file] and
+@scheme[write-file]. It facilitates the reading and writing of entire files
+in one batch. 
+
+@defproc[(read-file [f (and/c string? file-exists?)]) string?]{
+ reads the content of file @scheme[f], located in the samd folder
+ (directory) as the program, and produces it as a string. If @scheme[f]
+ doesn't exist, the function signals an error.
+}
+
+@defproc[(write-file [f string?] [cntnt string?]) boolean?]{
+ turns @scheme[cntnt] into the content of file @scheme[f], located in the
+ same folder (directory) as the program. If the file exists when the
+ function is called, the function produces @scheme[true]; otherwise it
+ produces @scheme[false].}

collects/teachpack/2htdp/scribblings/universe.scrbl

@@ -21,7 +21,7 @@
 
 @; -----------------------------------------------------------------------------
 
-@title{Worlds and the Universe}
+@teachpack["universe"]{Worlds and the Universe}
 
 @author{Matthias Felleisen}