[file handler] add method get an ItemDescriptor for a single section

file_handler.py

@@ -179,6 +179,17 @@ class FileHandler(metaclass=Singleton):
     def filename(self):
         return self._filename
 
+    def request_section_descriptor(self, id):
+        fs = self._entity_buffer.get(id)
+        if fs is None:
+            found_section = self._nix_file.find_sections(lambda s: s.id == id)
+            fs = found_section[0] if len(found_section) > 0 else None
+        if fs is None:
+            return None
+        else:
+            item = ItemDescriptor(fs.name, fs.id, fs.type, definition=fs.definition, entity_type=NodeType.Section)
+            return item
+    
     def request_metadata(self, root_id=None, depth=1):
         """[summary]
 
@@ -196,7 +207,22 @@ class FileHandler(metaclass=Singleton):
         def get_properties(section):
             props = []
             for p in section.props:
-                value = "unset"
+                value = ""
+                if self._file_version < (1,1,1):
+                    vals = p.values 
+                    if len(vals) > 1:
+                        value += "["
+                        value += ",".join(map(str, [v.value for v in vals]))
+                        value += "]"
+                    else:
+                        value = str(vals[0].value)    
+                else:
+                    vals = p.values
+                    value += "["
+                    value += ",".join(map(str, [v.value for v in vals]))
+                    value += "]"
+                if p.unit is not None:
+                    value += " " + p.unit
                 props.append(ItemDescriptor(p.name, p.id, value=value, entity_type=NodeType.Property))
             return props