cameo/: new commands "remove" and "keep" for path filtering (untested)

cameo/path.c

@@ -75,7 +75,7 @@ static struct path *path_from(const struct path *old)
 }
 
 
-static struct point *clone_point(struct point *p)
+static struct point *clone_point(const struct point *p)
 {
 	struct point *n;
 
@@ -156,6 +156,25 @@ struct path *path_reverse(const struct path *path)
 }
 
 
+struct path *path_clone(const struct path *path)
+{
+	struct path *new;
+	const struct point *p;
+	struct point *n;
+
+	new = path_from(path);
+	for (p = path->first; p; p = p->next) {
+		n = clone_point(p);
+		if (new->first)
+			new->last->next = n;
+		else
+			new->first = n;
+		new->last = n;
+	}
+	return new;
+}
+
+
 static void path_reverse_inplace(struct path *path)
 {
 	struct point *points = NULL, *p, *next;