make temporary nesting work better with limited streams, fix a bug with unlimit

basis/io/streams/limited/limited-docs.factor

@@ -81,7 +81,7 @@ ARTICLE: "io.streams.limited" "Limited input streams"
 "Unlimits a limited stream:"
 { $subsection unlimit }
 "Unlimits the current " { $link input-stream } ":"
-{ $subsection limit-input }
+{ $subsection unlimit-input }
 "Make a limited stream throw an exception on exhaustion:"
 { $subsection stream-throws }
 "Make a limited stream return " { $link f } " on exhaustion:"

basis/io/streams/limited/limited-tests.factor

@@ -1,6 +1,7 @@
 USING: io io.streams.limited io.encodings io.encodings.string
 io.encodings.ascii io.encodings.binary io.streams.byte-array
-namespaces tools.test strings kernel io.streams.string accessors ;
+namespaces tools.test strings kernel io.streams.string accessors
+io.encodings.utf8 io.files destructors ;
 IN: io.streams.limited.tests
 
 [ ] [
@@ -59,3 +60,19 @@ IN: io.streams.limited.tests
     "abc" <string-reader> 3 stream-eofs limit unlimit
     "abc" <string-reader> =
 ] unit-test
+
+[ t ]
+[
+    "abc" <string-reader> 3 stream-eofs limit unlimit
+    "abc" <string-reader> =
+] unit-test
+
+[ t ]
+[
+    [
+        "resource:license.txt" utf8 <file-reader> &dispose
+        3 stream-eofs limit unlimit
+        "resource:license.txt" utf8 <file-reader> &dispose
+        [ decoder? ] both?
+    ] with-destructors
+] unit-test

basis/io/streams/limited/limited.factor

@@ -5,7 +5,7 @@ USING: kernel math io io.encodings destructors accessors
 sequences namespaces byte-vectors fry combinators ;
 IN: io.streams.limited
 
-TUPLE: limited-stream stream count limit mode ;
+TUPLE: limited-stream stream count limit mode stack ;
 
 SINGLETONS: stream-throws stream-eofs ;
 
@@ -24,13 +24,24 @@ M: decoder limit ( stream limit mode -- stream' )
 M: object limit ( stream limit mode -- stream' )
     <limited-stream> ;
 
-: unlimit ( stream -- stream' )
+GENERIC: unlimit ( stream -- stream' )
+
+M: decoder unlimit ( stream -- stream' )
     [ stream>> ] change-stream ;
 
+M: object unlimit ( stream -- stream' )
+    stream>> stream>> ;
+
 : limit-input ( limit mode -- ) input-stream [ -rot limit ] change ;
 
 : unlimit-input ( -- ) input-stream [ unlimit ] change ;
 
+: with-unlimited-stream ( stream quot -- )
+    [ clone unlimit ] dip call ; inline
+
+: with-limited-stream ( stream limit mode quot -- )
+    [ limit ] dip call ; inline
+
 ERROR: limit-exceeded ;
 
 ERROR: bad-stream-mode mode ;