Re-organize the sync detection routine

1 files changed, 23 insertions, 5 deletions

diff --git a/src/main.c b/src/main.c
index 168860f..04e4d90 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1074,7 +1074,11 @@ static void ftag_query(int argc, char **argv)
 	free(tags);
 }
 
-static void ftag_sync(int argc, char **argv)
+/* Return:
+ * - positive value if local ftag database is newer than the remote one;
+ * - zero           if both ftag databases have the same last modification time;
+ * - negative value if remote ftag database is newer than the local one. */
+static int ftag_sync_compare_mtimes(void)
 {
 	char *remote_path = FTAG_REMOTE_ROOT "/ftag.sqlite3";
 	char cmd[1024];
@@ -1104,10 +1108,24 @@ static void ftag_sync(int argc, char **argv)
 	struct stat st;
 	rc = stat(DATABASE_PATH, &st);
 	time_t local_mtime = st.st_mtim.tv_sec;
-	if (local_mtime > remote_mtime)
-		printf("ftag sync: local is more recent than remote !\n");
-	else
-		printf("ftag sync: remote is more recent than local !\n");
+	return local_time - remote_time;
+}
+
+static int ftag_sync_is_local_newer(void)
+{
+	return ftag_sync_compare_mtimes() > 0;
+}
+
+static int ftag_sync_is_remote_newer(void)
+{
+	return ftag_sync_compare_mtimes() < 0;
+}
+
+static void ftag_sync_pull(int argc, char **argv)
+{
+	if (!ftag_sync_is_remote_newer())
+		return;
+	/* TODO: resume here */
 }
 
 /* Check that the tag we are trying to create does not exist yet. If this