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clojureclojurescript

IllegalArgumentException: No implementation of method: :as-file of protocol: #'clojure.java.io/Coercions found for class: clojure.lang.Symbol

I'm trying to write a macro for use from ClojureScript to handle file I/O for a Reagent app. I get this error:

IllegalArgumentException: No implementation of method: :as-file of protocol: #'clojure.java.io/Coercions found for class: clojure.lang.Symbol

When I try to do the following:

(def file-string "/Users/luciano/Dropbox/projects/test/resources/blog/test.md")
(get-file file-string)

But I can do this just fine:

(get-file "/Users/luciano/Dropbox/projects/test/resources/blog/test.md")

This is the macro:

(defmacro get-file [fname]
  (slurp (io/file fname)))

What am I doing wrong here?

Solution

  • What this means is you are trying to call the macro with a symbol that doesn't have a value at runtime.

    (def my-file "foo.txt")
(def file-str (get-file my-file))

    Will work while

    (defn foo [s]
  (get-file s))

(foo "foo.txt")

    will not.