Detect and handle deletion of previously downloaded dependencies from ~/.m2 more gracefully. (relates to #146)

Author: holgerbrandl

src/main/kotlin/kscript/app/DependencyUtil.kt

@@ -27,7 +27,15 @@ fun resolveDependencies(depIds: List<String>, customRepos: List<MavenRepo> = emp
             .associateBy({ it.split(" ")[0] }, { it.split(" ")[1] })
 
         if (cache.containsKey(depsHash)) {
-            return cache.get(depsHash)
+            val cachedCP = cache.get(depsHash)!!
+
+
+            // Make sure that local dependencies have not been wiped since resolving them (like by deleting .m2) (see #146)
+            if (cachedCP.split(":").all { File(it).exists() }) {
+                return cachedCP
+            } else {
+                System.err.println("[kscript] Detected missing dependencies in cache.")
+            }
         }
     }