I'll start with the following, which works properly.

(deftype MyType [a b])
(MyType. 1 2)
;; => #object[sometest.MyType 0x57c6a598 "[email protected]"]

Then, l add toString:

(deftype MyType [a b]
  Object
  (toString [_] (str "#MyType " [a b])))

(MyType. 1 2)
;; => #object[sometest.MyType 0x1987e9b3 "#MyType [1 2]"]

Now it's rendered with nippy error (also ignoring toString:

Now I add two more interfaces:

(deftype MyType [a b]
  Object
  (toString [_] (str "#MyType " [a b]))
  clojure.lang.Sequential
  clojure.lang.Seqable
  (seq [_] (seq [a b])))

(MyType. 1 2)
;; => #object[sometest.MyType 0x6fd2252 "#MyType [1 2]"]

Now, generating html causes the exception:

1. Unhandled java.lang.AbstractMethodError
   Receiver class sometest.MyType does not define or inherit an
   implementation of the resolved method 'abstract clojure.lang.ISeq
   seq()' of interface clojure.lang.Seqable.

                   RT.java:  543  clojure.lang.RT/seqFrom
                   RT.java:  537  clojure.lang.RT/seq
                  core.clj:  139  clojure.core/seq
                  core.clj: 7392  clojure.core/bounded-count
                  core.clj: 7386  clojure.core/bounded-count
               viewer.cljc:  320  nextjournal.clerk.viewer$bounded_count_opts$fn__18923/invoke
               viewer.cljc:  320  nextjournal.clerk.viewer$bounded_count_opts/invokeStatic
               viewer.cljc:  317  nextjournal.clerk.viewer$bounded_count_opts/invoke
               viewer.cljc:  418  nextjournal.clerk.viewer$describe/invokeStatic
               viewer.cljc:  366  nextjournal.clerk.viewer$describe/invoke
               viewer.cljc:  372  nextjournal.clerk.viewer$describe/invokeStatic
               viewer.cljc:  366  nextjournal.clerk.viewer$describe/invoke
                  view.clj:  110  nextjournal.clerk.view/->result
                  view.clj:  109  nextjournal.clerk.view/->result
                  view.clj:  164  nextjournal.clerk.view/describe-block
                  view.clj:  151  nextjournal.clerk.view/describe-block
                  core.clj: 2635  clojure.core/partial/fn
                  core.clj: 2746  clojure.core/map/fn/fn
     PersistentVector.java:  343  clojure.lang.PersistentVector/reduce
                  core.clj: 6885  clojure.core/transduce
                  core.clj: 6901  clojure.core/into
                  core.clj: 6889  clojure.core/into
                  view.clj:  171  nextjournal.clerk.view/doc->viewer/fn
                  core.clj: 6185  clojure.core/update
                  core.clj: 6177  clojure.core/update
                  view.clj:  171  nextjournal.clerk.view/doc->viewer
                  view.clj:  167  nextjournal.clerk.view/doc->viewer
                 clerk.clj:  274  nextjournal.clerk/file->viewer
                 clerk.clj:  271  nextjournal.clerk/file->viewer
                 clerk.clj:  273  nextjournal.clerk/file->viewer
                 clerk.clj:  271  nextjournal.clerk/file->viewer
                  core.clj: 2598  clojure.core/juxt/fn
                  core.clj: 2746  clojure.core/map/fn/fn
     PersistentVector.java:  343  clojure.lang.PersistentVector/reduce
                  core.clj: 6885  clojure.core/transduce
                  core.clj: 6901  clojure.core/into
                  core.clj: 6889  clojure.core/into
                 clerk.clj:  380  nextjournal.clerk/build-static-app!
                 clerk.clj:  366  nextjournal.clerk/build-static-app!
                      REPL:   15  sometest/eval25870

I belive it's something with state / caching

When I copied above code to the different namespace I've got the same error. When I changed MyType to MyType2 the result is almost ok (ignoring toString though):

adding another interface causes an error again (for example clojure.lang.Counted (count [_] 2)

pushed a fix for the first issue https://github.com/nextjournal/clerk/commit/a30123a231a4b13e7caed66e12b4d29bdd92d772 now looking at the second one…

I can generate a static app fine

can you try to add the ^:nextjournal.clerk/no-cache tag to see if that fixes it?

ok, yeah, I can reproduce

no-cache seems to work

I think the issue is that we’re not yet handling deftype wrt caching

can you make an issue with your code?

yes, sure!

thank you!

thank you!

oh, not sure how this works with lein and git deps these days…

I tried to run clj -X:build but have no access to cas repo

(in-ns 'nextjournal.clerk.viewer)

(defn- var-from-def? [x]
  (and (map? x) (get x :nextjournal.clerk/var-from-def)))

maybe easiest to try this in the repl

Ok, tried that and no changes (looks like this functions is not called)

genuary.2022.day26> (in-ns 'nextjournal.clerk.viewer)
#namespace[nextjournal.clerk.viewer]
nextjournal.clerk.viewer> (defn- var-from-def? [x] (println "aaa") 
    (and (map? x) (get x :nextjournal.clerk/var-from-def)))
#'nextjournal.clerk.viewer/var-from-def?
nextjournal.clerk.viewer> (clerk/build-static-app! {:out-path "docs" :paths ["src/genuary/2022/day26.clj"]})
#error {
 :cause class clojure.lang.Keyword cannot be cast to class java.lang.Character (clojure.lang.Keyword is in unnamed module of loader 'app'; java.lang.Character is in module java.base of loader 'bootstrap')
 :via
 [{:type java.lang.ClassCastException
   :message class clojure.lang.Keyword cannot be cast to class java.lang.Character (clojure.lang.Keyword is in unnamed module of loader 'app'; java.lang.Character is in module java.base of loader 'bootstrap')
   :at [clojure.lang.RT uncheckedIntCast RT.java 1476]}]
 :trace

nextjournal.clerk.viewer> (var-from-def? 123)
aaa
false

ah right, it is being called but there’s more you need to reload

not as easy as I thought from the repl

but I tried the fix and am pretty confident it’s working…

ok, I'll switch to deps then

does https://github.com/RickMoynihan/lein-tools-deps work?

it works, I use it in other projects

so yes, I need to switch to that, thanks

it's working! thanks a lot 😄

great! Thanks for the report

we were actually talking about this piece of code and we wondering if it’s safe to call get yesterday 😼

you can pass a :path-prefix param (with a trailing, not leading slash), e.g. build/

and for the links to work, you need a http server

(for the :bundle? false option that is)

or how do you think the links are wrong?

Thanks @mkvlr… :path-prefix "public/build/" is what I needed to get my hyperlinks to work (when using :bundle? false). Although (very minor) build-static-app! still tries to open my web browser at when is what works.

I don’t think you want public in your links or do you actually want to serve it from your.domain/public/build?

…as you say, I don’t want public in my URLs but, I was struggling to get to the right value for a :path-prefix. This is what now works for me in my deps.edn:

:aliases {:web-pages   
          ;; To use this alias...
          ;; (1) run a webserver, e.g.
          ;;       python3 -m http.server 7778 --directory public
          ;; (2) and run this alias, e.g.
          ;;       clj -X:web-pages
          ;; (3) once Clerk has finished generating the HTML files
          ;;       it will open a web browser at the 'index' URL for those HTML files:
          ;;         
          {:extra-paths ["datasets"]
           :exec-fn     nextjournal.clerk/build-static-app!
           :exec-args   {:bundle?     false
                         :path-prefix "build/"
                         :paths       ["index.md"
                                       "notebooks/scotgov_datasets.clj"
                                       "notebooks/wikidata_label_first_querying_for_scotgov_agencies.clj"]}}}

yeah, in this case I expect only a map, this is a data structure internal to Clerk so I don’t think being defensive hurts here

as we’ve seen it can cause problems in real-world code 😼

I think this is just the normal Clojure printing, so yes.