Redraw only if line changed

1 files changed, 9 insertions, 5 deletions

diff --git a/jet.c b/jet.c
index 0d1181a..b65ef81 100644
--- a/jet.c
+++ b/jet.c
@@ -37,15 +37,19 @@ int main(int argc, char *argv[]) {
 	for (int i = 0; i < file_size; i++) {
 		if (buffer[i] == '\n') number_of_lines++;
 	}
+	int old_line = -1;
 	while (1) {
-		int iter_line = 0;
-		for (int i = 0; i < file_size && iter_line < window_height + current_line; i++) {
-			if (iter_line >= current_line) addch(buffer[i]);
-			if (buffer[i] == '\n') iter_line++;
+		if (old_line != current_line) {
+			clear();
+			int iter_line = 0;
+			for (int i = 0; i < file_size && iter_line < window_height + current_line; i++) {
+				if (iter_line >= current_line) addch(buffer[i]);
+				if (buffer[i] == '\n') iter_line++;
+			}
 		}
 
+		old_line = current_line;
 		int input = getch();
-		clear();
 
 		switch (input) {
 			case KEY_UP: