ctucx.git: nimgit

reference.nim: split resolveTarget into own proc

diff --git a/nimgit/reference.nim b/nimgit/reference.nim
@@ -22,17 +22,22 @@ proc getRepo* (reference: GitReference): GitRepository = reference.getOwner()
 
 proc getType* (reference: GitReference): GitReferenceType = cast[GitReferenceType](git_reference_type(reference))
 
+proc resolveTarget(reference: GitReference): GitReference =
+    if reference.getType() != referenceSymbolic:
+        raise newException(ValueError, "Not a symbolic reference!")
+
+    let error = git_reference_resolve(addr result, reference)
+
+    if error != 0:
+        free(result)
+        raise newException(CatchableError, "Cannot lookup symbolic reference: " & $error.getResultCode)
+
 proc getTarget* (reference: GitReference): GitObjectId =
     case reference.getType():
         of referenceDirect:
             result = git_reference_target(reference)
         of referenceSymbolic:
-            var targetReference: GitReference
-            let error = git_reference_resolve(addr targetReference, reference)
-
-            if error != 0:
-                raise newException(CatchableError, "Cannot lookup symbolic reference: " & $error.getResultCode)
-
+            var targetReference = reference.resolveTarget()
             result = git_reference_target(targetReference)
             free(targetReference)