Phew! Got it working. Thanks for your tip, Dom. For some reason I had the idea
that macros written for clojurescript needed to be expanded in a clojurescript
repl. Once I realised that was incorrect things became much easier. In the end
i just needed to also quote unquote the `IFn` protocol name like this:
(defmacro defthing [name args]
`(defrecord ~name ~args
~'IFn
(~'-invoke [this#] (str "Hello, " ~(first args)))))
On Sunday, October 19, 2014 2:40:49 PM UTC+1, Russell Dunphy wrote:
> Thanks, that's definitely a step in the right direction. It still doesn't
> work, but there is now a function for arity 1 of invoke in the __proto__ map.
> There's still a `true` value for cljs.core$ifn$-invoke however, which I'm
> guessing is related to why it's not working.
>
> I would desperately like to make use of the various macroexpands, but so far
> I have had absolutely zero luck getting a working clojurescript repl that has
> access to my application code. Going to spend some more time trying to get
> that working now.
>
> On Sunday, October 19, 2014 3:37:54 AM UTC+1, Dom Kiva-Meyer wrote:
> > You are resolving the protocol method symbol.
> >
> > `(-invoke ...) expands to (your.namespace/-invoke ...)
> >
> >
> > To fix this, you need to quote (not syntax-quote) and unquote the symbol.
> > `(~'-invoke ...) expands to (-invoke ...)
> >
> >
> > Make liberal use of clojure.core/macroexpand, clojure.core/macroexpand-1,
> > and clojure.walk/macroexpand-all when writing macros.
> >
> >
> >
> >
> > On Sat, Oct 18, 2014 at 4:58 PM, Russell Dunphy <[email protected]>
> > wrote:
> > I'm having real difficulty trying to write a macro that creates a defrecord
> > which implements certain protocols in Clojurescript.
> >
> >
> >
> > I've created a minimal example project that shows the problem I'm having at
> > https://github.com/rsslldnphy/cljs-protocols-in-macros
> >
> >
> >
> > The example has two records, one created with a plain defrecord that
> > implements IFn, the other that does exactly the same but in a macro. The
> > plain defrecord works as expected, but the one created in a macro doesn't -
> > it's not callable as a function.
> >
> >
> >
> > Weirdly it returns true for (ifn?) however. Looking at the js console
> > (screenshot in the repository) the macro created record seems to have a
> > value of `true` in its __proto__ map for cljs.core.IFn (whereas all the
> > other entries in the __proto__ map are functions, and the plain defrecord
> > has function entries for the different arities of `invoke`).
> >
> >
> >
> > I'm lost at this point (and new to Clojurescript). Am I doing something
> > wrong? Is this even possible?
> >
> >
> >
> > Thanks,
> >
> >
> >
> > Russell
> >
> >
> >
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