Only run the merge tool on files with differences

If the backup file and the data file are equal, there is no need to run
the merge tool.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

1 files changed, 15 insertions, 7 deletions

diff --git a/src/calcurse.c b/src/calcurse.c
index e31770c..8ba25ed 100644
--- a/src/calcurse.c
+++ b/src/calcurse.c
@@ -290,13 +290,21 @@ static inline void key_generic_reload(void)
 			io_save_todo(path_todo_backup);
 			io_save_mutex_unlock();
 
-			const char *arg_apts[] = { conf.mergetool, path_apts,
-						   path_apts_backup, NULL };
-			wins_launch_external(arg_apts);
-
-			const char *arg_todo[] = { conf.mergetool, path_todo,
-						   path_todo_backup, NULL };
-			wins_launch_external(arg_todo);
+			if (!io_files_equal(path_apts, path_apts_backup)) {
+				const char *arg_apts[] = { conf.mergetool,
+							   path_apts,
+							   path_apts_backup,
+							   NULL };
+				wins_launch_external(arg_apts);
+			}
+
+			if (!io_files_equal(path_todo, path_todo_backup)) {
+				const char *arg_todo[] = { conf.mergetool,
+							   path_todo,
+							   path_todo_backup,
+							   NULL };
+				wins_launch_external(arg_todo);
+			}
 
 			xfree(path_apts_backup);
 			xfree(path_todo_backup);