So I've written a transducer to build up urls from relative links:
(defn build-url
([root]
(fn [xf]
(fn
([] (xf))
([links] (xf links))
([links suffix]
(xf links (let [root (if (.endsWith root ".html")
(string/replace root #"\w+\.html$" "")
root)]
(str root suffix))))))))
This works great when I know the "root" in advance. The issue is that I
want to run this recursively, building up the links as I go. As an example:
1) The main index page is, e.g., "http://www.website.com/index.html";. The
"index.html" part gets stripped off by the transducer, leaving the root as
"http://www.website.com/index.html";.
2) index.html contains, inter alia, a list of links to other index pages,
e.g. "/index1/", "/index2/", etc.
3) Running the transducer once yields `["http://www.website.com/index1/";,
"http://www.website.com/index2/"...]`
4) I want to be able to then run the transducer again on the links scraped
from each of the sub-indexes, ensuring that each is compounded with the
correct root element, e.g. `["http://www.website.com/index1/foo";,
"http://www.website.com/index1/bar";, "http://www.website.com/index2/baz";,
"http://www.website.com/index2/quux"...]`
Ideally, I'd like to be able to do this with as little intermediate "stuff"
as possible, i.e., not doing something like `(into [] (comp transducer1
transducer2 build-url) (into [] (comp transducer3 build-url)))`.
Is there a way to capture this with transducers? Something like (fn [foo]
(mapcat #(somefn foo %) (someotherfn foo))?
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