[Zope] How to get the DTML code from a document/method?

[Tony McDonald]

>
>This is implemented as a Python External Method.  I've pasted the source
>code below:
>
>Python source  -->  import string
>Python source  --> 
>Python source  -->  def view_source(self,path):
>Python source  -->          "view the source of a Document"
>Python source  -->          id=string.split(path,"/")[-1]
>Python source  -->          if not id: id="index_html"
>Python source  -->          if not id in self.documentIds():
>Python source  -->                  id="index_html"
>Python source  -->          doc=getattr(self,id)
>Python source  -->          return doc.read_raw()
>Python source  -->          return id
>
>This gets called from a dtml_source document whose contents (strangely
>enough!) can be seen at:
>
>http://www.zope.org/dtml_source?path=/dtml_source
>

I'm doing something daft here - I keep getting
<!--
 Error type: 
 Error value: read-only buffer, class
 -->
.....
....
<!--
Traceback (innermost last):
  File lib/python/ZPublisher/Publish.py, line 877, in publish_module
  File lib/python/ZPublisher/Publish.py, line 590, in publish
    (Info: /dtml_source)
  File lib/python/OFS/DTMLDocument.py, line 212, in __call__
    (Object: dtml_source)
  File lib/python/OFS/DTMLDocument.py, line 208, in __call__
    (Object: dtml_source)
  File lib/python/DocumentTemplate/DT_String.py, line 513, in __call__
    (Object: dtml_source)
  File lib/python/DocumentTemplate/DT_Var.py, line 239, in render
    (Object: view_source(path))
  File lib/python/DocumentTemplate/DT_Util.py, line 266, in eval
    (Object: view_source(path))
  File &lt;string&gt;, line 0, in ?
  File lib/python/Products/ExternalMethod/ExternalMethod.py, line 
254, in __call__
    (Object: CopySource)
    (Info: (('index_html',), {}, None))
TypeError: (see above)

-->

(this was from trying /dtml_source?path=index_html but path='anything 
else' gives the same error).

Is there a reason why there are two return statements in the external 
method, when it seems that only the return doc.read_raw() is going to 
be called?

tone
------
Dr Tony McDonald,  FMCC, Networked Learning Environments Project
The Medical School, Newcastle University Tel: +44 191 222 5888
Fingerprint: 3450 876D FA41 B926 D3DD  F8C3 F2D0 C3B9 8B38 18A2