Clojurians Log v2

👋:skin-tone-4:

Hey guys, I'm looking to send emails with Clojure. I'm new to the Java eco-system. I saw that there is this clojure lib (postal : https://github.com/drewr/postal), which wraps Jakarta Mail. Anyone have an opinion on Postal or Jakarta Mail ? Thanks 😉

Another one to evaluate is <https://github.com/toyokumo/tarayo> it’s pretty simple.

However, for the moment, I’m mostly sending emails via Amazon SES. Works great (with the cognitect aws libraries)

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Given a collection like:

[{:lname "ln", :fname "First user", :email "<mailto:x.y+1@domain.com|x.y+1@domain.com>", :mobile "+1111111121", :secondarychannels [{:m "email", :mv "<mailto:x.y+first1@domain.com|x.y+first1@domain.com>"} {:m "email", :mv "<mailto:x.y+first2@domain.com|x.y+first2@domain.com>"} {:m "sms", :mv "+1111111111"}]} {:lname "ln", :fname "Second user", :email "<mailto:x.y+3@domain.com|x.y+3@domain.com>", :mobile "+1111111112", :secondarychannels [{:m "email", :mv "<mailto:x.y+second1@domain.com|x.y+second1@domain.com>"} {:m "email", :mv "<mailto:x.y+second4@domain.com|x.y+second4@domain.com>"} {:m "sms", :mv "+1111111131"}]}]

Pseudocode:

let x = {:emails [] :sms []}
for every element in collection->secondarychannels, if m == email, append mv to emails collection (in x), else append mv to sms collection (in x).

you could group secondarychannels by :m and then use the values I believe

There’s a library called meander that was written for this sort of thing. If you’re new to Clojure it may or may not be a good fit, but you might be interested anyway. https://github.com/noprompt/meander

Your pseudocode seems to easily translate to a reduce

I played around a bit for fun and ended up with with this:

(->> stuff
     (mapcat :secondarychannels)
     (reduce (fn [agg {k :m v :mv}]
               (update agg (keyword k) conj v)) {}))

Unless you specifically need the ordering, sets seem like a better semantic fit for your two resulting collections.

I agree with @simongray on that the set would be the right data structure for these kinds of operations. There are std functions for sets, like select, join and so on, which seem to be the right fit for the transformations you want to do.

I mean, what you're building here IS an index and this IS a relational database

Anyone familiar with clojure.java-time? I’m having trouble finding the right function in the docs to convert a string timestamp to a more readable date-time format. Given a timestamp in ISO-8601 "2020-11-22T19:00:01.000939-06:00", how would I be able to convert it to something like “Nov. 22, 2020 07:00 PM” or even “2020-11-22 7:00 PM”?

the "format" and "formatter" from this ns are imported into the primary ns, and are made for this sort of thing https://github.com/dm3/clojure.java-time/blob/master/src/java_time/format.clj

I have a hunch this library makes more sense if you are familiar with the underlying classes it wraps

(which kind of begs the question regarding using the library...)

there is a simple looking example in the README though

(format "MM/dd" (zoned-date-time 2015 9 28))
=> "09/28"

Thank you. I’ll try out format

Hi everyone, I'm trying to get started with compojure (after a few years' hiatus), and I'm having a hard time getting route/resources to work. I'm not even able to get <http://clojure.java.io|clojure.java.io>.resource to work:

mkdir resources
echo 'hi' > resources/x
clojure -e "(require '<http://clojure.java.io|clojure.java.io>) (prn (<http://clojure.java.io/resource|clojure.java.io/resource> \"x\"))"
nil

clojure 1.10.1 for reference

have you tried using the a name.extension convention? https://docs.oracle.com/javase/8/docs/technotes/guides/lang/resources.html#res_name_context

Yep, if I use the filename hello.txt as in the clojuredocs example (https://clojuredocs.org/clojure.java.io/resource) I still get nil

I think I got it, I wanted route/files instead of routes/resource. I'm not sure why, I guess I don't really understand resources

If you use route/files, you'll find your app won't work when you build an uberjar and run it (via java -jar).

I see, so that's more for accessing files on a target system then? So how do I get resource to work?

You need resources on your classpath to be able to pick up files from it. That's why running clojure like that isn't seeing it.

Ok, I'm just using tools.deps, not lein, so I assume that's something lein-ring handles for you? So it's probably just a flag I pass to clojure when I run my program

(! 729)-> mkdir jstaab
(! 730)-> cd jstaab/
(! 731)-> mkdir resources
(! 732)-> echo 'hi' > resources/x
(! 733)-&gt; clojure -e "(require '<http://clojure.java.io|clojure.java.io>) (prn (<http://clojure.java.io/resource|clojure.java.io/resource> \"x\"))"
WARNING: When invoking clojure.main, use -M
nil
(! 734)-&gt; clojure -Sdeps '{:paths ["resources"]}' -e "(require '<http://clojure.java.io|clojure.java.io>) (prn (<http://clojure.java.io/resource|clojure.java.io/resource> \"x\"))"
WARNING: When invoking clojure.main, use -M
#object[java.net.URL 0x34a1d21f "file:/Users/sean/clojure/jstaab/resources/x"]

Or put a deps.edn file in that directory that has :paths ["resources" "src"] (assuming you also have a src folder)

neat, I'll try that

That did the trick! Thanks Sean, you remain the best.