Indexes symbols in repositories using Ctags. Similar in architecture to searcher, except over ctags output.

The ctags output is stored in SQLite files on disk (one per repository@commit). Ctags processing is lazy, so it will occur only when you first query the symbols service. Subsequent queries will use the cached on-disk SQLite DB.

It is used by basic-code-intel to provide the jump-to-definition feature.

It supports regex queries, with prefix queries (^foo) and exact match queries (^foo$) optimized to perform index lookups. The symbols sidebar and search-based code intel benefit from these optimizations.