change lib::Record string representation to handle empty parts better

...no need to enclose empty sections when there are no
attributes or no children. Makes test code way more readable.



TestEventLog_test PASS as far as implemented

src/lib/diff/record.hpp

@@ -731,11 +731,10 @@ namespace diff{
     using lib::transformIterator;
     
     return "Rec("
-         + (TYPE_NIL==type_? "" : type_+"| ")
-         + join (transformIterator (this->attribs(), renderAttribute))
-         + " |{"
-         + join (this->scope())
-         + "})"
+         + (TYPE_NIL==type_? "" : type_)
+         + (isnil(this->attribs())? "" : "| "+join (transformIterator (this->attribs(), renderAttribute))+" ")
+         + (isnil(this->scope())?   "" : "|{"+join (this->scope())+"}")
+         + ")"
          ;
 #endif
   }

tests/15library.tests

@@ -256,7 +256,7 @@ END
 TEST "Generic Record data node" GenNodeBasic_test <<END
 out: GenNode.+_CHILD_Record.+Rec.spam..ham = DataCap.+eggs
 out-lit: --spam--
-out: GenNode.+"baked beans".+Rec.hasSpam = DataCap.«bool».+«char».+«std::string».*«double».+GenNode.+"spam".+«lib::diff::Record<lib::diff::GenNode>».+«std::string».eggs.+«std::string».spam.+«std::string».spam
+out: GenNode.+"baked beans".+Rec...hasSpam = DataCap.«bool».+«char».+«std::string».*«double».+GenNode.+"spam".+«lib::diff::Record<lib::diff::GenNode>».+«std::string».eggs.+«std::string».spam.+«std::string».spam
 out: GenNode.+"hasSpam".+«bool».1
 out: GenNode.+_CHILD_char.+«char».\*
 out: GenNode.+_CHILD_string.+«std::string».★

tests/library/test/test-event-log-test.cpp

@@ -87,9 +87,9 @@ namespace test{
           log.verify("α").before("β");
           VERIFY_ERROR (ASSERTION, log.verify("β").before("α"));
           
-          CHECK (join(log) == "Rec(EventLogHeader| ID = TestEventLog_test."+idi::instanceTypeID(this)+" |), "
-                           +  "Rec(event|  |{α}), "
-                           +  "Rec(event|  |{β})");
+          CHECK (join(log) == "Rec(EventLogHeader| ID = "+idi::instanceTypeID(this)+" ), "
+                           +  "Rec(event|{α}), "
+                           +  "Rec(event|{β})");
         }