[Fix #108] Degrade gracefully on cljc projects

Instead of blowing up, because the finding of macro definitions doesn't
work, we now return partial results in find-symbol like we did prior to
adding macro support.

src/refactor_nrepl/find/find_macros.clj

@@ -177,7 +177,12 @@
   "Finds all occurrences of the macro, including the definition, in
   the project."
   [fully-qualified-name]
-  (when (fully-qualified-name? fully-qualified-name)
+  (when (and
+         ;; Fail gracefully instead of blowing up with reader errors
+         ;; when project contains cljc files until we had proper
+         ;; support
+         (empty? (util/find-cljc-files-in-project))
+         (fully-qualified-name? fully-qualified-name))
     (let [all-defs (find-macro-definitions-in-project)
           macro-def (first (filter #(= (:name %) fully-qualified-name) all-defs))
           tracker (tracker/build-tracker)

src/refactor_nrepl/util.clj

@@ -9,7 +9,7 @@
              [find :refer [find-clojure-sources-in-dir]]
              [parse :refer [read-ns-decl]]]
             [me.raynes.fs :as fs])
-  (:import java.io.PushbackReader
+  (:import [java.io File PushbackReader]
            java.util.regex.Pattern))
 
 (defn alias-info [full-ast]
@@ -42,6 +42,18 @@
   []
   (mapcat find-clojure-sources-in-dir (dirs-on-classpath*)))
 
+(defn find-in-dir
+  "Searches recursively under dir for files matching (pred ^File file). "
+  [pred ^File dir]
+  (filter pred (file-seq dir)))
+
+(defn cljc-file?
+  [^File f]
+  (.endsWith (.getPath f) ".cljc"))
+
+(defn find-cljc-files-in-project []
+  (mapcat (partial find-in-dir cljc-file?) (dirs-on-classpath*)))
+
 (defn node-at-loc? [loc-line loc-column node]
   (let [{:keys [line end-line column end-column]} (:env node)]
     ;; The node for ::an-ns-alias/foo, when it appeared as a toplevel form,