add crop-to-visible function (C)

1 files changed, 27 insertions, 3 deletions

diff --git a/screen.c b/screen.c
index 0c5f2d8..965d440 100644
--- a/screen.c
+++ b/screen.c
@@ -197,6 +197,26 @@ void update_current(){
 	fflush(stdout);
 }
 
+void erase_blank_lines(int y1, int y2){
+	int j;
+	if (y1 > y2){
+		y1 ^= y2;
+		y2 ^= y1;
+		y1 ^= y2;
+	}
+	
+	for (; y1 <= y2; y1++){
+		j = screen[y1].lst; 
+		while (j>=0 && isblank(screen[y1].s[j]))
+			j--;
+		if (j<0){
+			screen[y1].lst = -1;
+			screen[y1].s[0] = '\0';
+		}
+	}
+}
+
+
 void erase_line(int i){
 	screen[i].lst = -1;
 	screen[i].s[0] = '\0';
@@ -446,13 +466,16 @@ void find_nonblank_rect(int *x1, int *y1, int *x2, int *y2){
 		*y2 = i;
 		if (i < *y1)
 			*y1 = i;
-		if (screen[i].lst > *x2)
-			*x2 = screen[i].lst;
 		j = 0;
-		while(j <= screen[i].lst && isblank(first=screen[i].s[j]))
+		while((j <= screen[i].lst)  && isblank(first=screen[i].s[j]))
 			j++;
 		if (j < *x1)
 			*x1 = j;
+		j = screen[i].lst;
+		while(isblank(screen[i].s[j]))
+			j--;
+		if (j > *x2)
+			*x2 = j;
 	}
 }
 
@@ -478,6 +501,7 @@ void crop_to_nonblank(){
 	fprintf(stderr, "crop rectangle: (%d, %d)-(%d, %d)\n", x1, y1, x2, y2);
 #endif
 	crop_to_rect(x1, y1, x2, y2);
+	modified=1;
 	redraw();
 }