completify: add missing Source functions and tests

Author: mpsonntag

+nix/Source.m

@@ -24,6 +24,10 @@
             obj.sourcesCache.lastUpdate = 0;
         end;
 
+        function hasSource = has_source(obj, id_or_name)
+            hasSource = nix_mx('Source::hasSource', obj.nix_handle, id_or_name);
+        end;
+        
         function delCheck = delete_source(obj, del)
             [delCheck, obj.sourcesCache] = nix.Utils.delete_entity(obj, ...
                 del, 'nix.Source', 'Source::deleteSource', obj.sourcesCache);

nix_mx.cc

@@ -167,6 +167,7 @@ void mexFunction(int            nlhs,
             .reg("createSource", &nix::Source::createSource)
             .reg("deleteSource", REMOVER(nix::Source, nix::Source, deleteSource))
             .reg("sources", &nix::Source::sources)
+            .reg("hasSource", GETBYSTR(bool, nix::Source, hasSource))
             .reg("openSource", GETBYSTR(nix::Source, nix::Source, getSource))
             .reg("openMetadataSection", GETCONTENT(nix::Section, nix::Source, metadata))
             .reg("set_metadata", SETTER(const std::string&, nix::Source, metadata))

tests/TestSource.m

@@ -7,6 +7,7 @@
     funcs{end+1} = @test_delete_source;
     funcs{end+1} = @test_attrs;
     funcs{end+1} = @test_fetch_sources;
+    funcs{end+1} = @test_has_source;
     funcs{end+1} = @test_open_source;
     funcs{end+1} = @test_set_metadata;
     funcs{end+1} = @test_open_metadata;
@@ -120,3 +121,21 @@
     s.definition = '';
     assert(isempty(s.definition));
 end
+
+%% Test: nix.Source has nix.Source by ID or name
+function [] = test_has_source( varargin )
+    fileName = 'testRW.h5';
+    sName = 'nestedsource';
+    f = nix.File(fullfile(pwd, 'tests', fileName), nix.FileMode.Overwrite);
+    b = f.createBlock('testblock', 'nixBlock');
+    s = b.create_source('sourcetest', 'nixSource');
+    nested = s.create_source(sName, 'nixSource');
+    nestedID = nested.id;
+
+    assert(~s.has_source('I do not exist'));
+    assert(s.has_source(sName));
+
+    clear nested s b f;
+    f = nix.File(fullfile(pwd, 'tests', fileName), nix.FileMode.ReadOnly);
+    assert(f.blocks{1}.sources{1}.has_source(nestedID));
+end