Clojure-Contrib

• Type: Defect
• Status: In Progress
• Resolution: Unresolved
• Affects Version/s: None
• Fix Version/s: None
• Component/s: None
• Labels:

  None

Reproduce the bug with:

(require 'clojure.contrib.io)
(clojure.contrib.io/append-writer "/xyz.txt")
</code></pre>
which will throw an Exception ���Cannot change an open stream to append mode���.

This is caused because of a flaw in the call chain.
*clojure.contrib.io/writer* for Strings calls again *writer* for whatever *clojure.contrib.io/output-stream*
returns. We call *append-writer* which then calls *writer* on the String which in turn then calls:
<pre><code>
output-stream for ^String which calls
    output-stream for ^URL which calls
        output-stream for ^File which binds *append* to false and calls
            output-stream for ^OutputStream which
            returns a BufferedOutputStream instance which then jumps back to the
        ^File handler, which removes its binding for *append*!! and returns the BOS to the
    ^URL handler which returns the BOS to the
^String handler

At this point the outer binding (for append) is set to true again, and assert-not-appending fails.

• Assignee:

  bpsm

  Reporter:

  Anonymous

• Created:

  04/Aug/10 3:54 PM

  Updated:

  26/Aug/10 8:25 PM