I would just like to throw in a quick idea.<div>The easiest way to support noweb tangling is to get org-babel-tangle to create nested tags and change detangle to take these into account.</div><div><br></div><div>for example, i have the forex_user source block that is tangled.</div>
<div><br></div><div><div>;; [[file:~/Dropbox/.rep/clj-forex/clj-forex.org::*User][forex_user]]</div><div>my code...</div></div><div><div>;; [[file:~/Dropbox/.rep/clj-forex/clj-forex.org::*User][embedded_block]]</div><div>
my embedded code ...</div></div><div>;; embedded_block ends here</div><div>;; forex_user ends here</div><div><br></div><div>corresponding to a forex_user block of </div><div>#+begin_src</div><div>  my code ...</div><div>  &lt;&lt;embedded_block&gt;&gt;</div>
<div>#+end_src</div><div><br></div><div>This would only work for noweb on separate lines and preferably only when one block is noweb embedded into one other source block, but i believe that this is the most common case anyways. This could be enforced in the detangle/tangle code.</div>
<div><br></div><div>Then, a separate minor mode could make these file: markers invisible and create a colored overlay pattern per source block code. Saving the file would still save the markers, you just wouldnt see them if the minor mode was on.</div>