<RefEntry id="file-extension">
<!-- This file is generated automatically from the DSSSL source. -->
<!-- Do not edit this file! -->
<?html-filename file-extension.html>

<RefMeta>
  <RefEntryTitle>file-extension</RefEntryTitle>
  <RefMiscInfo Role="file">dblib.dsl</RefMiscInfo>
</RefMeta>

<RefNameDiv>
  <RefName>file-extension</RefName>
  <RefPurpose>Return the extension of a filename</RefPurpose>
</RefNameDiv>

<RefSynopsisDiv><Title>Synopsis</Title>
<Synopsis>
(file-extension filespec)
</Synopsis>
</RefSynopsisDiv>

<RefSect1><Title>Description</Title>

<para>
Returns the extension of a filename.  The extension is the last
"."-delimited part of the name.  Returns "" if there is no period
in the filename.</para>


</RefSect1>

<RefSect1><Title>Author</Title>

<para>
Norman Walsh, &lt;ndw@nwalsh.com&gt;
</para>
</RefSect1>
<RefSect1><Title>Source Code</Title>

<ProgramListing>
(define (file-extension filespec) 
  ;; Return the extension of a filename
  (if (string? filespec)
      (let* ((pathparts (match-split filespec "/"))
	     (filename  (list-ref pathparts (- (length pathparts) 1)))
	     (fileparts (match-split filename "."))
	     (extension (list-ref fileparts (- (length fileparts) 1))))
	(if (> (length fileparts) 1)
	    extension
	    ""))
      ""))
</ProgramListing>
</RefSect1>

</RefEntry>