static size_t op_replace(Vis *vis, Text *txt, OperatorContext *c) {
size_t count = 0;
Iterator it = text_iterator_get(txt, c->range.start);
while (it. pos < c->range.end && text_iterator_char_next(&it, NULL))
count++;
op_delete(vis, txt, c);
size_t pos = c->range.start;
for (size_t len = strlen(c->arg->s); count > 0; pos += len, count--)
text_insert(txt, pos, c->arg->s, len);
return pos;
}
static size_t op_change(Vis *vis, Text *txt, OperatorContext *c) {
op_delete(vis, txt, c);
macro_operator_record(vis);
return c->range.start;
}