support line-by-line undo in text mode

1 files changed, 7 insertions, 0 deletions

diff --git a/draw.c b/draw.c
index e4c3250..1e73719 100644
--- a/draw.c
+++ b/draw.c
@@ -77,10 +77,13 @@ void get_text(FILE *fc){
 	int orig_x = x;
 
 	redraw();
+	copy_lines_to_ring(y, y, PRV_STATE);
 	while((c=fgetc(fc))!=EOF && c != 27){
 		if(c=='\n'){
 			set_cur(BG);
+			copy_lines_to_ring(y,y, NEW_STATE);
 			y += 1;
+			copy_lines_to_ring(y, y, PRV_STATE);
 			x = orig_x;
 		}
 		else {
@@ -95,6 +98,8 @@ void get_text(FILE *fc){
 		status_bar();
 		show_cursor();
 	}
+	if (modified)
+		copy_lines_to_ring(y, y, NEW_STATE);
 	mode=MOVE;
 }
 
@@ -245,6 +250,7 @@ update_arrow:
 		show_cursor();
 	}
 	if (c == 'a' || c == '\n'){
+		invalidate_undo();
 		draw_arrow(orig_x, orig_y, arrow, arrow_len, FIX);
 		modified = 1;
 	}
@@ -278,6 +284,7 @@ void erase(FILE *fc){
 	int orig_x = x, orig_y = y;
 	status_bar();
 	show_cursor();
+	invalidate_undo();
 	while((c=fgetc(fc))!=EOF && c!=27 && c!= 'x' && c != '\n'){
 		if (!move_around(c, fc)) continue;
 		check_bound();