> I would also love to know how you set this up in a little more detail. It
> really sounds like an excellent approach…
Sure: it's not complicated! I'm writing this in a hurry though- so
hope it's still clear.
Basically I just define a memoized "dynamic scripts" function that
returns a map with a text/javascript Ring response, along with a hash
of that response.
So something like (def dynamic-scripts (memoize (function []
{:response foobar :hash (make-hash foobar)}))
Then I've got a Compojure route configured to serve requests like so:
(GET "/dynamic-stuff/:hash/scripts.js" {} (:response (dynamic-
scripts)))
This'll just send back the memoized script response anytime a request
is made for /dynamic-stuff/whatever/scripts.js
The /whatever/ is important since it let's me automatically include
the current hash in any script tags in the HTML with URI (str "/
dynamic-stuff/" (:hash (dynamic-scripts)) "/scripts.js").
Now all I need to do when I want to tweak the scripts is reevaluate
the namespace they're in and it'll re-hash, meaning that all future
requests for scripts.js go to the new resource - avoiding any possible
caching issues.
What I've described so far doesn't necessitate anything ClojureScript.
But with ClojureScript, the dynamic-scripts function can be easily
modified to produce it's response by compiling ClojureScript source.
This is awesome since it means I can keep everything in one
environment, and compilation happens automatically any time there is a
change to the underlying source. The scripts.js is always optimized,
always up-to-date, and always hashed to avoid caching problems.
When I want to test a change to the scripts, I just reevaluate the ns
then refresh my browser and the changes are live. If there's a major
compile-time bug in the scripts, it'll get caught before any changes
take affect.
BTW if the devs are listening, it'd be nice if cljsc/build could one
day also support input/output directly via strings :) That'd make all
this absolutely trivial(er).
--
Peter
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