[OMCPath] add implementation using OMC via sendExpression()

Author: syntron

OMPython/OMCSession.py

@@ -282,12 +282,27 @@ def with_segments(self, *pathsegments):
         # overwrite this function of PurePosixPath to ensure session is set
         return type(self)(*pathsegments, session=self._session)
 
+    def is_file(self) -> bool:
+        return self._session.sendExpression(f'regularFileExists("{self.as_posix()}")')
+
+    def is_dir(self) -> bool:
+        return self._session.sendExpression(f'directoryExists("{self.as_posix()}")')
+
+    def read_text(self) -> str:
+        return self._session.sendExpression(f'readFile("{self.as_posix()}")')
+
+    def write_text(self, data: str) -> bool:
+        return self._session.sendExpression(f'writeFile("{self.as_posix()}", "{data}", false)')
+
+    def unlink(self) -> bool:
+        return self._session.sendExpression(f'deleteFile("{self.as_posix()}")')
+
     # TODO: implement needed methods from pathlib._abc.PathBase:
-    #       is_dir()
-    #       is_file()
-    #       read_text() + binary()?
-    #       write_text() + binary()?
-    #       unlink()
+    #       OK - is_dir()
+    #       OK - is_file()
+    #       OK - read_text() + binary()?
+    #       OK - write_text() + binary()?
+    #       OK - unlink()
     #       resolve()
     #       ... more ...
     #       ??? test if local (write OMC => READ local and the other way) and use shortcuts ???