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feat(indexing): add persistent index cache and incremental reparse

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- Pass extension storage path to the server (client/ changes) so the
  server can persist a workspace index.
- Introduce IndexCache (server/tools/index_cache.py) and load/save it on
  initialization and after background indexing. Index entries are stored
  only when the file's stat hasn't changed while being read.
- Add incremental reparse logic (server/tools/incremental_parse.py) and
  use a per-file _last_parse cache in the language server to reparse only
  the top-level Tcl commands touched by an edit, falling back to a full
  parse when necessary.
- Use a new _FileIndex dataclass and _build_file_index helper to unify
  what is stored/loaded for a file; update update_poco_completion_for_file
  to use the persistent cache for disk-read files (from_disk/source_stat).
- Keep background indexing non-blocking and persist the index at the
  end of the run. Add basic unit tests for incremental parse and index cache.

Before: edits and background work always required full parsing of files
and no persistent cross-restart index. After: some edits reuse previous
ASTs and files read from disk can use a persisted index to skip
re-indexing across restarts.
This commit is contained in:
Christoph Brandau
2026-09-23 13:20:09 +02:00
parent b2e6e9d250
commit 01e8670cc1
10 changed files with 674 additions and 42 deletions
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CHANGELOG.md
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## Unreleased
- Reparse only the top-level TCL commands touched by an edit instead of the whole file
- Cache the workspace index in the extension storage so restarts skip reparsing unchanged files; the cache is discarded automatically when the server or bundled tclint changes
- Speed up TclOO completion, signature help, inlay hints, and Go to Definition by reusing the cached syntax tree and skipping files without classes
- Speed up references, document highlights, and call hierarchy with cached definition lookups
- Keep background indexing from blocking requests that need a fresh syntax tree
- Add Go to Definition for TclOO classes, constructors, and resolved methods, including PSC library definitions
- Index PSC layer scripts (including external paths and legacy Windows encoding) and share TclOO class metadata across files for completion, signatures, inlay hints, and highlighting
- Add document-local TclOO method completion for `new`/`create` instances, `my`, and statically inferred return chains