cptemplate,error.py: Add handling for when target file already exists

bin/cptemplate

@@ -78,9 +78,12 @@ if __name__ == "__main__":
 
     try:
         dest_file.touch(mode=0o600, exist_ok=False)
-    except FileExistsError:
-    # force_overwrite true: overwrite
-    # force_overwrite false: print error message
-        raise NotImplementedError("Implement if file already exists")
+    except FileExistsError as e:
+        if args.force_overwrite:
+            dest_file.touch(mode=0o600, exist_ok=True)
+            dest_file.write_bytes(selected_file.read_bytes())
+        else:
+            print(e)
+            exit(error.E_FILE_EXISTS)
     else:
         dest_file.write_bytes(selected_file.read_bytes())

file_scripts/error.py

@@ -12,6 +12,7 @@ E_NOFILESELECTED = 2
 E_NOEDITORFOUND = 3
 E_NO_RESULTS = 4
 E_USER_RESPONSE_NO = 5
+E_FILE_EXISTS = 6
 
 # ----- Messages -----
 NO_FILE_SELECTED_MESSAGE = "No file was selected."