+ const struct msg_location *loc = m->location;
+ if (m->category != MSG_C_GENERAL
+ && loc->src && loc->start.line && loc->start.column
+ && msg_handler.lex_source_get_line)
+ {
+ int l0 = loc->start.line;
+ int l1 = loc->end.line;
+ int nl = l1 - l0;
+ for (int ln = l0; ln <= l1; ln++)
+ {
+ if (nl > 3 && ln == l0 + 2)
+ {
+ ds_put_cstr (&s, "\n ... |");
+ ln = l1;
+ }
+
+ struct substring line = msg_handler.lex_source_get_line (
+ loc->src, ln);
+ ss_rtrim (&line, ss_cstr ("\n\r"));
+
+ ds_put_format (&s, "\n%5d | ", ln);
+ ds_put_substring (&s, line);
+
+ int c0 = ln == l0 ? loc->start.column : 1;
+ int c1 = ln == l1 ? loc->end.column : ss_utf8_count_columns (line);
+ if (c0 > 0 && c1 >= c0)
+ {
+ ds_put_cstr (&s, "\n |");
+ ds_put_byte_multiple (&s, ' ', c0);
+ if (ln == l0)
+ {
+ ds_put_byte (&s, '^');
+ if (c1 > c0)
+ ds_put_byte_multiple (&s, '~', c1 - c0);
+ }
+ else
+ ds_put_byte_multiple (&s, '-', c1 - c0 + 1);
+ }
+ }
+ }
+