I have built an aggregator site (http://wwwatts.net) using some home grown software written in groovy to do aggregation and publishing pages. The result is okay but now I want to shift to Drupal for it and the FeedAPI is nigh on perfect. However there are some things which were required on wwwatts.net which I don't see how to do in FeedAPI.. so I just wrote a little module for one of these things.
Namely...
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It's helpful to modify the title to be "Tag: Title" .. e.g. "AutoBlogGreen: GM Admits it was wrong to kill the EV1, claims it will make it all better" .. Each site of course doesn't publish those tags in their titles, but once the item arrives on my site I want the tag to be there.
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Some sites have terms & conditions on their feeds which preclude use of anything but the titles. For those I delete the body content.
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Some sites publish screwball stuff in their item content, so I have code to remove various tags ...
FeedMapper isn't useful for this. The Transformations module may be what's needed but I was totally mystified by it as to how to do anything.
I have the feedapi_munger module here:
http://hg.davidherron.com/index.cgi/drupalv6/file/tip/sites/all/modules/...
Looking forward to your thoughts..