Major updates/cleanup.

src/internal/vase/vase.cc

@@ -74,14 +74,7 @@ void _insert(AppendStorage *ap, Shard **root, Point *point, const char *data, ui
     ++lines;
     last_line = ++data;
   }
-  uint64_t col = 0;
-  uint64_t remaining = end - last_line;
-  while (remaining) {
-    uint64_t n = grapheme_next_character_break_utf8(last_line, remaining);
-    last_line += n;
-    remaining -= n;
-    ++col;
-  }
+  uint64_t col = end - last_line;
   if (lines) {
     point->row += lines;
     point->col = col;
@@ -122,6 +115,22 @@ Shard *replace(AppendStorage *ap, Shard *root, Range range, const char *data, ui
   return insert(ap, root, &range.start, data, len);
 }
 
+Point eof_point(Shard *root) {
+  if (!root)
+    return {0, 0};
+  Point result{
+    .row = root->lines,
+    .col = 0
+  };
+  PetalIterator it(root, Direction::Forward);
+  it.seek_line(root->lines);
+  const char *data;
+  uint64_t len;
+  while (it.next(&data, &len))
+    result.col += len;
+  return result;
+}
+
 uint64_t offset_of(Shard *root, Point point) {
   return offset_of(root, point.row) + point.col;
 }