I think it loads/run all tests defined in your tests folder

I have not used react, so am ignorant of the details of how $ works there. Does something go wrong if you use ($ AssetSelectControl @state) ? If so, I would recommend asking in some react-specific channel, or if there isn't one, perhaps in the #clojurescript channel, where more people are probably familiar with react.

@UJRDALZA5 just trying requires more time that I have. Are you saying that if I can't discover answers on my own because I don't have the time to spend on this discovery process, I don't deserve to understand clojure?

I think you will find a lot of developers spend lots of time experimenting when learning new things. Has this not been your experience?

You are certainly welcome to ask, and people here will answer if they know, but not everyone in the #beginners channel will be familiar with all libraries.

My experience is that clojure people simply cannot fathom why people who don't yet understand clojure don't want to spend 24/7 experimenting with clojure. I mean, what else can they be doing? I've been trying to use clojure for 8 years now and I was repeatedly blocked by this. Couple of years ago I was told not just to discover the answer on my own, but to write docs! A beginner writing docs to the code that experts don't understand!

@ashnur I did not mean it that way. What I meant is, Clojure REPL makes it insanely easy to try out stuff. Once you connect your editor to the REPL, every evaluation is a keypress away.

If you want help with a helix-specific thing, realize that perhaps a small fraction of participants in the #beginners channel will have used it.

In the absence of knowledge, the best we can do is suggest experiments to try, or find experts on the helix library.

With respect, I will leave this conversation before I say something that gets me banned.

or become knowledgeable about the helix library ourselves, and then answer you, which might take us more time than it would take you to figure out.

I am pretty sure that anything you can put in your $HOME/.lein/profiles.clj file can also be put into a project-specific project.clj file.

yes indeed, I put it both places. However, putting it in the project files does not seem to help the lein command line.

~/.lein is for your own convenience. CI/CD will expect the same configuration some other way as it won't have that configured already, unless documented otherwise.

I see in the ci/cd log that indeed the lein-cloverage jar file is being retrieved. However, the lein command line says cloverage is not a task.

so it has read the dependency in the project.clj file. but there's still a problem.

I sent an email to Jaeye, not sure whether he still maintains the tool....

Have you tried putting :plugins [[lein-cloverage "1.1.2"]] inside your defproject in your project.clj file?

And have no mention of cloverage in your ~/.lein/profiles.clj file?

No, i'll try adding the :plugins. should I remove it from :dependencies ?

Adding as plugin activates the task as well as pull the dependency I think.

Cool. I think it works now. thanks.

As a rough rule of thumb, I think :dependencies are for your project, either the normal run time of your project's code, or for test running time (although Leiningen lets you put test-specific dependencies in a different place in the project.clj file, so they are used only during test-running time, not for other 'production' uses of your code).

:plugins are for modifying how Leiningen itself works.

Great, the ci pipeline seems to have finished successfully! thanks for the help.

However, there is still something of a mystery.

No problem. Glad it is working.

What mystery is that?

the docs for cloverage say to add the following to my http://README.md file

[![codecov](]
 ()

But what are USERNAME and PROJECT-NAME ? it doesn't explain. is it my user name on the machine that's running the pipeline? Or is it my name on the local machine where I'm pushing from?

I would guess that is completely optional.

optional? I don't think so, because the place where the data is created does not ask for either piece of information.

I suspect the intent is that if you wanted some kind of 'badge' in a project that you published on Github, that gave summary information of the output of cloverage run on your project, and it was auto-updated every time you made a commit to the project, you could put that in your project's README

If you do not want that effect, you should be able to use cloverage without anything in your http://README.md file

Are you saying you want such an auto-updated thing in your project's http://README.md file?

I have not set up such an auto-updated 'badge' using Cloverage in any project of mine, nor other similar auto-updated badges. I see that the http://README.md file of the cloverage project itself has one, which you can see the source code of if you clone a copy of the cloverage project. It isn't obvious to me which user name should be used -- my guess would be either your Github username, or a username you must create on the http://codecov.io web site. Others who have done this would be better to confirm those guesses, though.

@U010VP3UY9X That is your Github username and repo name.

thanks for looking. yes it is a mystery. curious thing is that anyone with sufficient permission can push to my get repo, not only ME. and anyone else can read the http://README.md file So somehow the USERNAME has to be independent of person pushing.

what if my project is not on github?

and why would it need MY user name if joe-blow pushes to my git repo?

So, the /gh/ part of the URL says it is Github. For Gitlab it might be /gl/.

I found https://github.com/cloverage/cloverage/issues

I'll add some question/documentation issues there and see if the maintainers care to answer this mystery.

Issues page may not be for questions. I have seen some maintainers discourage that.

perhaps, but in my opinion a request to clarify documentation is a valid issue. Not everyone agrees of course.

You can set up Github repositories so only you can push to them. That is the default, I am pretty sure, unless you explicitly give others permission to push to them.

Even in repositories that multiple people can push to, those auto-generated badges are created via software running on sites like Travis and whoever created the site http://codecov.io, and to re-run automated tests, and publish the updated results, they must be run as some user on some machine somewhere. It is common for one person setting up a repo to create that setup, and then those automated jobs/tests/whatever are re-run as that configured user no matter who pushes to it.

But again, I am pretty sure that by default a Github repo can only be pushed to by the person who created it, not Joe blow.

Anybody in the world can create their own personal fork of a public Github repo, and push to their own fork, but not the original, unless the original gives them permission to do so.

@U0CMVHBL2 yes. I think with gitlab I can prevent forking. As I understand, I have to allow permission to fork. But anyone who can read can clone with a normal git clone operation. BTW, I looked at the bash script. https://codecov.io/bash and there seems to be come code to handle gitlab, but it is not clear how it works.

@U010VP3UY9X So I know I said this before, but if you do not care about publishing code coverage data to the world, you can completely ignore the contents of that link, and need not put anything in your README. You can use cloverage to get coverage data for yourself, and not publish it. Or you can get that coverage data and publish it by just copying and pasting the results into some file that you publish. That 'badge' link is only if you want the results automatically updated on every commit.

Sorry to sidestep the conversation, but I will use a thread. Does a macro receive a map literal differently than a map? And if yes, does it unlock more powers?

No, the reader will create the map from the map literal when read, and macros receive the data-structure returned by the reader.

But the distinction still matters, because you can only pass things by value or by reference

The value representation of a map is the map literal

A macro does receive (deref foo) differently than {:some-key some-expression} , even if the value of foo happens to be (atom {:some-key some-expression})

A macro receives the args as the syntax you see in the macro invocation, without evaluation.

But if you have a map instance, you need to pass it by reference, and that requires a symbol which refers to the instance, but now with a macro, the dereferencing isn't done for you, so if the macro doesn't dereference it will just get a symbol

Can I ask some more information on what 'reader form' is and what other forms there are? I might know what it is and just be ignorant of the terminology, but I am a bit of a loss here and this seems very important, basic stuff.

You would need to wrap the macro in another macro that would convert the map instance back into a map literal and put that as the argument to the other macro to pass that back in as a map literal

https://clojure.org/reference/reader

All this is going over my head right now but I will bookmark this conversation and come back to it later. Thanks a lot!

I find a lot of beginner material either avoid the topic not to confuse beginners, or just do a poor job of talking about it.

But it is fundamental to Lisps

@ashnur I didn't notice if anyone used the term 'reader form' specifically, but in general the text of your code is read by the Clojure reader, before it is compiled, using the function read that is built into Clojure. It is possible to experiment at the REPL to see what that does using an expression like (read-string "{:foo 2}") , where read-string is like read , except it gets its input from the string that is the first arg.

@U0CMVHBL2 https://clojurians.slack.com/archives/C053AK3F9/p1586852681344300

The link to the http://clojure.org page on the reader is one solid source of info.

Thanks, I just shown you where I saw it mentioned since you said you didn't notice before...

Here is an example of behavior in the REPL that demonstrates how the reader treats the @ character when placed before a symbol:

user=> (read-string "@foo")
(clojure.core/deref foo)

I am still catching up with earlier responses, it's much harder to understand what is written than write it 🙂

When that http://clojure.org reference doc page says this:

@form ⇒ (deref form)

You can see in my read-string REPL example above how that corresponds to the documentation, hopefully.

Similarly:

user=> (read-string "'foo")
(quote foo)

corresponds to this on the documentation page:

'form ⇒ (quote form)

I understand most of it, yes, but I still haven't been able to put it together to use the macro properly with the map instance

The easyness of lisp is very misleading sometimes, just because I see the code as data explicitly, doesn't mean I understand the semantic content

From something that didibus said from looking at the docs, it appears that perhaps the $ macro has been written so that it expects a map literal as an argument, and doesn't behave the same way if given something that is not a map literal.

When I said "the docs" in my previous message, I mean the docs for helix (at least, I think that is probably what didibus was referring to -- I haven't read those docs myself)

Yes, that's why it doesn't work as I expected, that was very clear, @U0K064KQV gives good explanations : )

You should start thinking at 3 levels. You have the source code itself. That is a textual representation of your program. Like it's characters in a file or in a string. The text of your source code is first read by the reader, and this will parse the text and return a data-structure representation of the code. The link I gave details the logic the reader uses to parse the text into this data-structure form. For example, it says that characters between double quotes will become a String. Characters between square brackets will become a Vector. Characters between whitespace that don't start with numbers or colon will become a Symbol. Characters between whitespace that start with a colon will become Keywords. Characters between whitespace that starts with @ will become a list of two elements, the first being the symbol deref and the second the characters after the @ as a Symbol. Etc. You can use read-string to try this out. You put textual code in a string and call read-string on it and you get back the data-structure the reader generates from it. Finally, Clojure will then compile and evaluate this data-structure, using some rules about how it goes about doing that. This will turn the data-structure representation of the code into its runtime form. One of the rules here is that if there are macros contained within, they will be given a chance to modify sub-sections of the data-structure before Clojure compiles and evaluates it.

Hard to explain more on slack. Maybe I should do a blog post on this. Cause examples would help.

That is incredibly useful, thanks again.

I think I just have to do ($ ComponentName {& @state}) seems to be working, but obviously I have other bugs too

Hum... That will set on your react Component the property & to be the map contained in state?

Is that what you want?

I am following this https://github.com/Lokeh/helix/blob/master/docs/creating-elements.md#dynamic-props so that's to pass dynamic props, my props are not dynamic but also not hand written, I don't really understand this terminology 🙂

Oh ya ok, seems that's also an explicit feature of the helix $ macro

So that won't work anywhere else FYI

That's why with Macros, it's always all bet are off go read the doc :p

yeah, but also helpful. I actually read that several times before I even asked the question here, but I just didn't connect the dots. You pointing out that the macro expects a 'literal' was what put things to place

Just so everyone is aware, I just noticed there is a #helix channel as well.

I asked there too, but no answers so far.

I generally tend to ask the person writing the library if I can, and only come to beginners or other big channels if I really have no idea : )

Yup, good macros can bring real convenience sometimes. Just tricky to write one and can be abused sometimes.

Not to say, don't ask here. Shared just in case you did not know, but seems you already know about it.

I don't follow the logic. Isn't that saying that it's a sequence of integers with size between 8 and 16?

@ashnur the logic is not so important. I could substitute any other regular expression for "a" and I could insert something between a?^8 and a^8. The example comes from https://swtch.com/~rsc/regexp/regexp1.html

its an example of a regexp for which the matching is linear in grep and awk, but is exponential in pcre as well as python, java, and ruby.

but ^ is start of the line

no, not sure what a more common syntax it, it means "match the previous regexp exactly 8 times"

I think in emacs regexp it is {8}, not 100% sure

you're right in the objection that different regexp implementations use very different semantics for the same syntax.

a?^3 is something like (a?)|(a?a?)|(a?a?a?),

BTW, I asked the same question on #clojure-spec

as far as I understand, if you can write a function to test this, that's enough for spec

Yeah, I asked a question there more than 24 hours ago and your question was the next message on the channel, it's been inactive. Maybe because of the holidays

it's not urgent. I'm mainly trying to determine whether spec is written to use exponential time or linear time to check regexps.

if linear time, then you can check many very complicated things extremely fast. if exponential time, then you have to avoid regexp as much as possible

Don't think you can do that with n

You'd need to repeat the 0 or 1 n times and then repeat the exactly n times

ahh perhaps its the same: a?a?a?a?a?a?a?a?aaaaaaaa

although if implemented the linear-time way, they turn out identical: a?|(a?a?)|(a?a?a?)|...|aaaaaaaa

and of course you cannot incorporate a variable n into the regular expression, otherwise it ceases being regular.

but for a given n we can programmatically generate the regexp

For example, for n=2

(s/def ::foo
 (s/cat
  :0 (s/? integer?)
  :1 (s/? integer?)
  :2 integer?
  :3 integer?))

But see, it's a bit annoying, because cat requires you to name the position, even if optional. And there are no 0 or n or exactly n, so you need to list each one.

The reason for naming the position is because spec lets you parse this into a map as well

(s/conform ::foo
 '(0 1 2 3))
;; => {:0 0, :1 1, :2 2, :3 3}
 
(s/conform ::foo
 '(2 3))
;; => {:2 2, :3 3}

And to check you use valid?

(s/valid? ::foo
 '(0 1 2 3))
;; => true

(s/valid? ::foo
 '(0 1 2 3 4))
;; => false

(s/valid? ::foo
 '(0 1))
;; => true

does interger? need to be the function or the symbol?

function

I tried to write a function to generate such a spec. but its difficult because the spec seems to be a macro which always sits in evaluation position. 😞

(defn gen-n [n name]
  (concat 
   (mapcat (fn [i]
             (list (keyword (format "%d" i)) `(s/? ~name))) (range n))
   (map  (fn [i]
           name) (range n))))

(defmacro match-n [n name]
  `(s/cat ~@(gen-n n name)))

(s/valid? (match-n 8 integer?) (concat (range 8) (range 8)))

this works.

but this doesn't

(map (fn [n] (s/valid? (match-n n integer?) 
                       (concat (range n) (range n))))
     (range 10))

Basically it's difficult to treat a spec as data.

but this is not the fault of spec, it's the nature of the problem you are trying to solve

> Basically it's difficult to treat a spec as data. That's one of the problems malli tires to solve https://github.com/metosin/malli

@UK0810AQ2 interesting.

@UK0810AQ2 does malli address regular patterns in sequences?

@U010VP3UY9X I think it's in development https://github.com/metosin/malli/pull/187

There's also a slack channel for #malli

Another option is to write it like this:

(-> (interleave thousands-qualifiers num)
    reverse
    (join " "))

Someone else can perhaps answer - but as far as I know, you may have to replace the ~ yourself with the result of java's System.getProperty("user.home"));

yup. that’s what bothers me.

(clojure.string/replace "~/path/to/home/stuff"
                        #"^~"
                        (System/getProperty "user.home"))

everywhere I look has something like this

What’s the context here? Why are you wanting to expand the home dir?

´~´ is a shell convention, and your application doesn't depend on your shell. To hook back into shell features:

(require '[clojure.java.shell :refer [sh]])

  (defn bash [& args]
    (apply sh "bash" "-c" args))

  (bash "echo ~")
  ;; => {:exit 0, :out "/home/teodorlu\n", :err ""}

I don't know anything about Packt's Clojure Workshop but if you're considering other options - https://www.braveclojure.com/ is very nice for beginners

I got this ebook already, seems really good. I'm gonna start reading it today. Thanks!

the key is in the map with a nil value

oh no you checked that

well shit 🙂

might you need to wrap id in (keyword id)?

what's (type id) and (type (first (filter #(= id %) (keys gs)))

They are both strings.

well that is incredibly strange

it's cljs, so I guess I shouldn't be surprised by anything, but I find this very surprising

did some method mutate the string, js strings are mutable right?

I'm kind of happy others also find this strange. Makes me a little more confident about my sanity. Pretty sure I'm not mutating anything.

out of curiosity, what does (get gs (-> gs keys first) :nothing) return?

That one works as expected, it returns the actual value for that key (which is too large to paste here).

it could be some corner case in the strings where they look equal but they hash differently - try (map hash (keys gs)) vs. (hash id)

While (= id (first (keys gs))) returns true .

If strings are equal according to = , can they really hash differently?

if somebody makes poor choices, absolutely - hash and equality are totally different code

They hash to the same thing.

"Poor choices"? We don't have any way to choose what hashing is used for Clojure strings, do we?

clojurescript uses javascript strings

I can't think of how two Objects can be = , hash to the same value, and lookup to fail on one as the key, for any Object type whatsoever, not just strings (except NaN, NaN is the only thing I can think of that would be like this)

but sure, everything is changeable

@U0CLH2QTV you can do weird things with object prototypes in js, methods like equality come from the prototype

Anyway, like I said, the hashes are identical.

something's messed with either the id or key object, the map, the get function, or some other function

Thank you all, anyway. I'll play around and see if I can solve the mystery.

Can you reproduce this situation in a separate cljs REPL, out of curiosity? There is nothing special about that string value that you mention, as I can start a cljs REPL and create a map with that key, and that value for id , and successfully get the value in the map using the value of id . I do not have any suggestions for what might be going wrong other than the ones mentioned earlier in this thread.

I have not see much RE tutorials, but here is a simple example of using it. https://gist.github.com/athomasoriginal/eadc022482c3432943c400cc8eeb1788 - perhaps that can help get you started 🙂

Its a simplified version of the Reitit example in their repo.

https://github.com/metosin/reitit/tree/master/examples

Thank you guys, I will check that 👍:skin-tone-6: