Anyone know how to get the clojure webdrive to press enter?

https://github.com/semperos/clj-webdriver/wiki/Taxi-API-Documentation#submit

???

submit should work

@jtackett: i remember sending Keys/ENTER as per http://stackoverflow.com/questions/1629053/typing-enter-return-key-in-selenium

I have a macro that mostly just expands into a def. When I try to require the namespace and use the defined var, it works with lein run, but not when it is inside an uberjar. Can anyone explain this behavior?

are you aot compiling the uberjar?

(and what do you mean by works? in what way does it not work?)

I was trying to find a way to avoid aot compilation

good

but are you aot compiling for your uberjar?

Yes. Turns out I am

:profiles {:uberjar {:aot :all}}

if I had to guess, I would say you are aot compiling for your uberjar, and your macro is def'ing directly instead of expanding in to code that defs

The macro is here: https://github.com/cddr/samza-config/blob/master/src/samza_config/job.clj#L112

so the def happens when the macro is expanded, which happens before compilation, which, well, when running aot compiled code, compilation has already happened, so the macro is never expanded / run

Right. That sounds like what's happening

The code calling this tries to resolve the symbol that would be defined by the expansion

is the namespace loaded before you resolve?

Yes

I was thinking about making this just a function anyway so I think I should probably just go ahead and do that

I don't see anything immediately wrong with that macro there

Hm, maybe it's something else then. Thanks for the note about when the code gets expanded. I was a bit fuzzy on that

Ah, if I try to resolve the var as opposed to just the quoted unqualified symbol, it works as expected

Or rather, I don't need to resolve anything. I can just use the var directly

So, maybe this is going to sound crazy

I’m writing a clojure.test test to demonstrate that a function doesn’t throw a stack overflow when operating on a deeply nested tree

The function definitely works as expected by itself

But throws a stack overflow error when being evaluated in a test

The logic from the function also works fine when “inlined" into the test

Anyone know of any behaviors where clojure.test could cause an intermediate lazy-seq in a function to be realized when it otherwise wouldn’t be?

@jonahbenton: Thank you, I'll check that option

When does it make sense to use comment rather than ;;? I can't see the purpose. Except perhaps for making comments a part of the AST and thus more malleable. 😕

commenting out a whole form

not linewise

Good point

I'm trying to comment inside a function - is there a best practice for this?

Can you even do it?

Not as the docstring, but in the function body.

(comment ...) evaluates and gives you nil as I recall, whereas ;; this comment is just a "pure comment"

And the convention in Clojure is ;; to comment out a whole line but ; to append a comment to the end of a line.

@seancorfield: That's what I read in the docs. I'm having trouble using either within a deftest that I want to explain a bit

Can you http://refheap.com the code that doesn't work so we can see what's up?

just a sec

https://www.refheap.com/115637

The comments are perhaps redundant and silly, but now that they don't work, I want to know why

I get a stackoverflowerror when running the tests using lein quickie

And I've run the tests, but in a different way, before

let me just try this way without the comments

Still get the error

Yeah, if you're not getting a syntax error, then the comments are fine.

I guess so

So I suspect your nth-generation is faulty.

That is curious, because I've run the same tests using is

with no error

Inside of nth-generation, I use nth on a lazy seq - I wonder if that gets messed up when using are

Try removing the names from those two anonymous functions at the end...

Or change them to something other than a and b...

Here is a paste of working isinvocations:

https://www.refheap.com/115638

Let me try with different anonymous functions

Your is version doesn't test functions, BTW.

how so?

You have the function test commented out

lines 47-48

But you don't need the a and b names inside the (fn ...) forms

changing the names of the anonymous functions to something else caused an error in that exact test, but other tests to g ogreen

I see what you mean, doh

Like I say tho' I think that's the issue: the a and b in the are test are being treated as the named arguments a and b in the are substitution...

Sounds like you have your solution now?

Well, almost I think

I just tried iswith the functions, works well, no problem

Let me try without function names and are

(I'm out for the night so good luck!)

Hah, I'm just about to get on the train to get to work (early!)

Thank you for your help!

Hmm, having a bit of trouble following that

Ah, I think I get it. I guess each fn invocation creates a new function instance... Maybe?

The conversion of functions to weird #<> names really confuses me.

Functions compile to Java classes. Anonymous functions get generated names. Because are is a macro expansion, you get multiple "textual" instances of each function so your fn will become multiple (different) classes.

But it seems like I end up with [(fn [] (+ 1 2)] when calling nth-generation as specified in the test.

So does that mess up equality?

Or are they still equal?

Each macro-expanded anonymous function will compile to a different class.

So your three a functions will become three different classes.

Does that mean that calling = on them will return false?

They're different classes so they cannot be equal.

So functions are not really values? Or maybe my understanding of values is wrong.

How would you expect two functions to be checked for "equality"?

Something's really weird...

I dont' know ¯\(ツ)/¯

The object receive the unicode text fine, but it's saved to the database as ??? instead of ななし ...

Which is weird, because I don't get this issue testing locally, only on wildfly deployment

But textually, I can see with my eyes that 1 = 1 and (fn [] (+ 1 2) = (fn [] (+ 1 2).

What about (fn [] (+ 2 1))?

or (fn [] ( + 1 2))

Bottom line: each anonymous function is considered unique (not equal to any other).

I see your point.

And because are is a macro and substitutes one of your functions three times, it will produce three unique values.

They would all evaluate to the same result but they are not equal.

Named functions defined with defn will compile to specific named classes (not generated names) so you could compare those for equality. I am on my iPhone so I don't have a REPL to verify that.

Haha, love the cljs-lambda docs: "Afterward, the resulting ARN is written into the project file, due to accumulating doubts around your ability to perform remedial tasks."

But does that mean that anonymous functions are not values in the sense that 1 or "Hello" or [1 2 3 4] are?

@seancorfield: I have already repl-tested nth-generation using references to defn'ed functions, and this seemed to have the intended result. Though I didn not compare for equality. Will have to give it a go.

Great success!

😄

Not all values can be compared for equality. Values of different types -- different classes -- will not compare equal (caveat: certain conversions are applied).

So the tests run with areand references to defn'ed functions. Thank you for you help, @seancorfield!

Cool!

I guess that is where my understanding of values breaks down. (The understanding I got from "Are we there yet")

But, yes, functions are values. But that doesn't mean all operators will apply.

You can't order functions for example.

I get what you are saying

And that is why we like data first, right?

Yup!

Because it's much more malleable.

Data Good 😸

So good 😄

Functions can be malleable too. Just in a different way

Midnight here. Back in eight hours or so!

But not as (depending on your qualification of malleability, I guess), right, @cddr ?

9 in the morning and my Java work resumes. Thank you!

Sure. There are more ways to combine "data" values like maps, vectors etc than there are ways to combine functions

oh my god this is NOT happening

file upload breaks in wildfly because i guess it handles uploads differently from tomcat!!!

Ughhh I am an IDIOT! Why didn't I check this earlier!!

OK... WTF? I had talked to the person who has control over the fileserver to include directories I asked for... Now file upload works on Wildfly. WTF

I'm not complaining, but thank god for dodging a bullet.

Hi, I’m having some issues with clojure.tools.namespace.repl/refresh - for some reason it’s started complaining that it can’t find my namespaces when I run (refresh). Initially in the repl everything works fine and I can run my code, but when I run (refresh) I then get errors about namespaces not found. Anyone got any ideas? Many thanks!

@tomoram: I had this just 2 days ago. It's somewhere up there in slack's logs.

Inspect the state in the private var refresh-tracker and see how its getting picked up

Then remove that dir with ctnr/set-refresh-dir

Or it may be as easy as clearing target and/or resources from old compilations stuff.

@rauh: Thanks for your suggestions. I’m fairly new to clojure.tools.namespace.repl so I’m not really sure what’s going on under the hood but that’s a great place to start

@tomoram: Just do a (deref #'ctnr/refresh-tracker) and search for the offending namespace. I just pasted it into vim and did a simple search.

@rauh: removing target seems to have solved the namespace issue but now it’s getting upset with a speclj symbol…at least it’s progress 😉

ok, so, this is an interesting challenge.. i was to convert a "nice" map into a more overhead array, i think it's kind of like an unzip or something... to illustrate, i have a map like this:

{:name "Joe Awesome"
 :email ""}

[{:key "name",
  :value "Joe Awesome"}
 {:key "email"
  :value ""}]

what kind of transformation function should i be using for this?

as in, i'm aware of all the different traversal/map/etc functions... just want to know what the idiomatic approach to this would be

hmmm, probably should first convert it to a sequence with seq, and then map it

(into [] (map (fn [[k v]] {:key k :value v}) {:name “Joe Awesome” :email “"}))

Can’t vouch for idiomaticness since I’m new to Clojure myself, but.

@tomoram: Most problems with tools.namespace like this are caused by either 1) stale AOT-compiled files on the class path; or 2) files whose ns declaration does not match their path/name. Do lein clean and restart the REPL will resolve (1).

Tools.namespace refresh does not work if anything in the project is AOT-compiled.

@stuartsierra: Great, thanks for the info. It’s working again now as expected (although a bit of an issue with speclj stubs but that’s a different issue) but it great to get a better understanding of what is going on. Thanks for your replies!

You're welcome.

is there any place I can read about AOT? It always confuses me. Some tools don’t work well with AOT, but then when I build an uberjar (with lein) it fails to do so if AOT is disabled.

http://clojure.org/reference/compilation

Ahead of time (AOT) compilation is only useful if you are delivering an application (not a library). It really only has two practical benefits: 1) a real main method which can be invoked from the java command line; 2) slightly faster startup time.

cool, that explains a lot. So I only need to enable AOT for core in most cases.

where core has a -main

Yes, and you should only enable AOT compilation for production (e.g. uberjar) builds. Never for development.

Thank you. This is very helpful.

You're welcome.

my preferred way to have aot is essentially

(ns my.shell (:gen-class))

(defn -main [& args]
   (require 'my.real.ns)
   (apply (resolve 'my.real.ns/-main) args))

this way only one harmless / mostly useless namespace is compiled, jsvc knows how to launch that ns, and it pulls in the rest without them needing compilation

anyone here familiar with hara?

A little bit, yeah

does anyone one know how to put a vector of 32 ints into an environment variable so environ can access it?

@virmundi: Well, environment variables can only hold string values. So some form of conversion is going to be necessary. You could store it in a bunch of different ways, but I might just go with EDN

sounds good. I wondered if this was built in

thanks

Ah, right. I don’t think there’s anything built in. I remember doing something similar when I used environ

@virmundi: If you're just starting with environ, it might be worth looking at https://github.com/tolitius/cprop instead - looks like it was built for that type of use case