I've written a pair of functions which read a stream of Clojure source and
identify the var[*] definitions. They work, but the way they work seems
clumsy to me. Here they are:
(defn find-vars-in-reader [eddi]
"Return a list of names of vars declared in the stream this reader
reads"
(try
(let [sexpr (read eddi)]
(cond
(nil? sexpr) nil
(= (first sexpr) 'def) (cons (first (rest
sexpr)) (find-vars-in-reader eddi))
true (find-vars-in-reader eddi)))
(catch RuntimeException eof)))
(defn find-vars-in-file [filename]
"Return a list of names of vars declared in the file at this path name"
(with-open [eddi (java.io.PushbackReader. (reader filename))]
(find-vars-in-reader eddi)))
The thing that really offends me about this is using catching a runtime
exception to stop reading. There must be a better way of detecting an
end-of-file, but I've missed it.
The other thing, though, is I can't help feeling that it would be more
idiomatic Clojure to write a wrapper around a source file which allowed
functions to treat the file as a lazy sequence of S-expressions; and I can't
help feeling someone must already have done this. Have they? Is there a library
I should be looking at?
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